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201. New Eco-gas mixtures for the Extreme Energy Events MRPCs: results and plans

Author: M. Garbini, M. Trimarchi, M. Battaglieri, Luca Baldini, O. Maragoto Rodriguez, S. Boi, D. Hatzifotiadou, Eugenio Scapparone, Mn Mazziotta, L. Galante, L. Votano, M. Rizzi, Giancarlo C. Righini, Francesco Noferini, F. Coccetti, S. Pisano, Giuseppe Mandaglio, M. C. S. Williams, S. Serci, A. Corvaglia, C. Ripoli, Antonio Trifiro, L. Zheng, G. Maron, M. P. Panetta, I. Gnesi, F. Nozzoli, Francesco Riggi, P. La Rocca, C. Gustavino, M. C. Vistoli, Luisa Cifarelli, S. Grazzi, F. Carnesecchi, E. Coccia, L. Fabbri, M. Abbrescia, D. De Gruttola, G. Piragino, P. Galeotti, S. De Pasquale, G. Terreni, Antonino Zichichi, R. Baldini Ferroli, A. Scribano, R. Paoletti, V. V. Frolov, L. Perasso, F. Palmonari, C. Cicalo, G. Gemme, Fabrizio Giulio Luca Pilo, Rosario Nania, C. Pellegrino, C. Avanzini, M. Selvi, R. Zuyeuski, E. Bossini, A. Chiavassa, S. Miozzi, M. Taiuti, Marco Schioppa, S. Squarcia, M. Panareo, W. Park, L. G. Batignani, G. Sartorelli, Pisano, S., Abbrescia, M., Avanzini, C., Baldini, L., Ferroli, R. Baldini, Batignani, L. G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., Gruttola, D. De, Pasquale, S. De, Fabbri, L., Frolov, V., Galante, L., Galeotti, P., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., Rocca, P. La, Mandaglio, G., Rodriguez, O. Maragoto, Maron, G., Mazziotta, M. N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M. P., Paoletti, R., Park, W., Pellegrino, C., Perasso, L., Pilo, F., Piragino, G., Riggi, F., Righini, G. C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, M. C., Votano, L., Williams, M. C. S., Zheng, L., Zichichi, A., and Zuyeuski, R.
Subjects: Physics - Instrumentation and Detectors, Resistive-plate chambers, Physics::Instrumentation and Detectors, Nuclear engineering, Resistive plate chamber, FOS: Physical sciences, Time resolution, Instrumentation and Detectors (physics.ins-det), Timing detectors, Gaseous detectors, Muon spectrometer, Particle tracking detectors, Greenhouse gas, Environmental science, Detectors and Experimental Techniques, Instrumentation, physics.ins-det, Mathematical Physics, Astrophysics::Galaxy Astrophysics
Abstract: The Extreme Energy Events observatory is an extended muon telescope array, covering more than 10 degrees both in latitude and longitude. Its 59 muon telescopes are equipped with tracking detectors based on Multigap Resistive Plate Chamber technology with time resolution of the order of a few hundred picoseconds. The recent restrictions on greenhouse gases demand studies for new gas mixtures in compliance with the relative requirements. Tetrafluoropropene is one of the candidates for tetrafluoroethane substitution, since it is characterized by a Global Warming Power around 300 times lower than the gas mixtures used up to now. Several mixtures have been tested, measuring efficiency curves, charge distributions, streamer fractions and time resolutions. Results are presented for the whole set of mixtures and operating conditions, %. A set of tests on a real EEE telescope, with cosmic muons, are being performed at the CERN-01 EEE telescope. The tests are focusing on identifying a mixture with good performance at the low rates typical of an EEE telescope., 8 pages, 6 figures, proceedings for the "XIV Workshop on Resistive Plate Chambers and Related Detectors" (19-23 February 2018), Puerto Vallarta, Jalisco State, Mexico
Published: 2019

202. Search for the decay Ds+ ??e+?e

Author: J. Libby, Y. Fu, Yaquan Fang, M. Greco, Shou-hua Zhu, J. H. Zou, Z. G. Wang, R. Kappert, Y. H. Yan, P. Kiese, Yuan Hou, Q. Q. Song, H. Y. Zhang, S. S. Sun, J. W. Zhao, Y. Ding, R. A. Briere, B. J. Liu, M. M. Ma, J. Chai, G. X. Sun, J. V. Bennett, Li Yan, X. Q. Hao, M. Qi, H. J. Yang, Z. Jiao, D. H. Zhang, E. M. Gersabeck, P. L. Wang, G. F. Chen, G. S. Huang, T. Y. Xing, Y. C. Zhu, G. F. Xu, S. Jin, Y. P. Guo, X. S. Jiang, S. Nakhoul, Tao Luo, H. B. Li, C. L. Luo, Q. Zhou, X. L. Luo, C.-H. Rosner, Jun-Yi Zhang, K. Schoenning, Q. Y. Li, B. S. Zou, W. Kühn, J. Y. Zhang, R. E. Mitchell, M. Kuessner, F. De Mori, Serkant Ali Cetin, P. Larin, R. X. Yang, H. H. Wang, Xiao-Rui Lyu, C. C. Zhang, B. Zhong, L. B. Guo, Q. A. Malik, G. Mezzadri, W. C. Yan, Z. P. Zhang, Yunlong Zhang, Z. Y. You, Z. A. Zhu, H. W. Wen, X. Y. Zhou, B. X. Yu, Zujian Wang, C. Sowa, Y. B. Zhao, Fang Liu, I. B. Nikolaev, Wei Xu, J. H. Yin, W. Shan, M. Shao, Y. T. Gu, D. Bettoni, J. Dong, Zhiqiang Liu, R. Kliemt, Qiang Zhao, Lei Li, S. Nisar, A. Pitka, M.G. Alekseev, A. N. Zhu, Tao Zhang, C. J. Tang, Y. Hu, K. Begzsuren, Y. P. Lu, J. L. Zhang, W. P. Wang, U. Wiedner, H. L. Jiang, I. Denysenko, L. M. Gu, A. Mangoni, M. N. Achasov, L. P. Zhou, A. Guskov, Jie Yu, F. Bianchi, Jianping Zheng, Y. M. Ma, Z. P. Mao, L. H. Wu, M. Richter, Z. Ning, S. Y. Xiao, X. Y. Song, Y. K. Heng, T. Khan, Shulei Zhang, F. Y. Li, Magnus Wolke, Y. F. Liang, D. P. Jin, H. S. Chen, Alperen Yuncu, M. Savrie, N. Hüsken, T. Y. Qi, J. Min, Y. F. Wang, Xu Shan, C. P. Shen, Yi Jin, H. B. Liu, B. Kopf, W. Imoehl, B. Y. Zhang, J. B. Jiao, J. Fang, J. W. Li, R. M. Wang, K. L. He, L. J. Wu, X. L. Ji, T. Held, X. F. Wang, Q. M. Ma, A. Mustafa, S. J. Zhao, T. J. Min, Xujin Yuan, K. J. Zhu, D. Y. Liu, Y. J. Xiao, S. X. Du, K. Y. Liu, H. L. Dai, J. Q. Zhang, T. Hussain, X. Y. Ma, A. Calcaterra, Z. G. Zhao, L. Z. Liao, X. H. Liu, Z. Y. Zhang, Y. J. Mo, S. B. Liu, H. J. Lu, J. G. Lu, N. Qin, Y. X. Xia, F. Feldbauer, Lingxuan Zhang, Yu Bai, W. X. Gong, H. H. Zhang, S. W. Han, Y. Yuan, Y. S. Zhu, G. Cibinetto, X. K. Zhou, A. Sarantsev, Matthew Glenn Kurth, D. H. Wei, P. R. Li, Bibo Ke, J. S. Lange, M. Destefanis, W. B. Yan, Y. Nefedov, X. L. Gao, Z. J. Sun, Jimin Zhao, P. L. Li, P. W. Luo, Q. J. Xu, Z. L. Huang, Y. G. Xie, Xiang-Gan Liu, M. H. Ye, F. E. Maas, T. Hu, S. Maldaner, J. P. Dai, J. C. Chen, Xuanhong Lou, Q. P. Ji, Viktor Thorén, I. R. Boyko, S. Pacetti, S. Leiber, O. Bakina, H. Liang, Ke Wang, H. H. Liu, J. C. Li, X. P. Qin, C. F. Redmer, Li Zhou, M. Ablikim, Liqing Xu, X. Y. Shen, X. Y. Jiang, Q. Ouyang, I. Uman, Nasser Kalantar-Nayestanaki, Y. G. Gao, Q. Liu, Tristan Weber, C. Dong, L. L. Ma, L. Gong, Z. L. Dou, S. Sosio, Z. Q. Yang, S. S. Fang, Ke Li, M. Bertani, P. X. Shen, J. Zhuang, J. D. Lu, L. G. Xia, C. H. Li, X. H. Sun, L. Y. Dong, L. Yang, Y. B. Liu, Z. Wu, M. X. Luo, D. V. Dedovich, S. L. Yang, A. Amoroso, G. Y. Tang, C. Morales Morales, F. F. Sui, Yue Pan, X. T. Huang, M. Albrecht, Zhiqing Zhang, J. S. Huang, S. Qian, Q. An, Jialun Ping, Jie Zhao, D. X. Lin, Z. Gao, M. H. Gu, R. Kiuchi, G. Felici, C. X. Liu, K. Zhang, X. Y. Zhang, Alexey Zhemchugov, H. M. Hu, A. Dbeyssi, S. L. Niu, G. Rong, F. H. Liu, H. Y. Sheng, W. D. Li, Z. J. Xiao, R. Poling, Z. X. Meng, F. H. Heinsius, Nicolas Berger, J. B. Liu, X. Q. Li, Y. F. Long, Joachim Pettersson, Ke Liu, X. P. Xu, X. B. Ji, Y. J. Sun, Yifan Yang, E. Boger, J. W. Zhang, X. A. Xiong, C. X. Yu, B. T. Tsednee, Fenfen An, Angelo Rivetti, H. J. Li, Dong E. Liu, P. Patteri, X. H. Li, Q. L. Xiu, Y. T. Tan, B. Zheng, R. G. Ping, K. Goetzen, A. A. Zafar, W. Gradl, X. N. Ma, B. L. Wang, Xingchao Dai, Y. H. Zheng, X. Tang, Xiaozhong Huang, Cong-Feng Qiao, X. H. Mo, T. C. Zhao, Z. A. Liu, L. S. Wang, M. Fritsch, S. Q. Qu, Z. B. Li, W. Ikegami Andersson, X. L. Wang, W. S. Cheng, G. Li, V. Prasad, M. Kavatsyuk, G. R. Liao, Andrzej Kupsc, Y. Ban, P. Weidenkaff, K. H. Rashid, L. L. Wang, H. Cai, T. Johansson, J. F. Chang, N. Yu. Muchnoi, C. D. Fu, S. P. Wen, M. Rolo, C. Q. Feng, X. S. Qin, B. X. Zhang, M. L. Chen, X. S. Kang, L. Koch, A. Khoukaz, X. R. Zhou, Cheng Li, O. B. Kolcu, Z. Y. Deng, M. Ripka, Y. H. Zhang, M. G. Zhao, Y. H. Yang, X. X. Ma, X. Cai, L. Lavezzi, S. L. Olsen, R. Baldini Ferroli, R. P. Guo, J. Zhu, Y. T. Liang, Xingguo Li, S. J. Chen, F. Cossio, Krisztian Peters, Z. Y. Wang, Teresa Lenz, B. Q. Wang, M. Z. Wang, X. N. Li, Haiping Peng, W. G. Li, A. G. Denig, Y. K. Sun, J. F. Sun, S. Spataro, S. Marcello, Y. Zeng, Y. J. Lin, H. M. Liu, J. F. Hu, Zhe Sun, S. Lusso, G. F. Cao, X D Shi, Y. J. Mao, H. X. Yang, I. Garzia, G. A. Chelkov, Y. H. Xie, J. Pellegrino, M. Maggiora, Ling Zhao, Lei Zhao, Z. L. Hou, C. Z. Yuan, N. Cao, B. Garillon, Y. B. Chen, J. G. Messchendorp, Xiaofeng Zhu, J. Z. Zhang, A. Q. Guo, J. J. Song, L. Sun, C. W. Wang, Muhammad Irshad, Z. H. Qin, M. Kuemmel, X. F. Cui, W. J. Zhu, X. D. Shi, F. A. Harris, W. L. Chang, Dan Wang, R. Farinelli, H. Leithoff, F. Li, F. C. Ma, H. L. Ma, D. M. Li, H. Muramatsu, M. Pelizaeus, J. Y. Liu, Q. Gao, Y. N. Gao, Y. Zhang, Feng Yan, J. Z. Fan, T. Liu, J. F. Qiu, M. Papenbrock, S. Ahmed, Y. X. Yang, Kang Li, L. Fava, Y. Z. Sun, I. K. Keshk, F. Nerling, C. X. Lin, Alexander Leon Gilman, M. Rump, Gang Zhao, M. Y. Dong, and İstanbul Arel Üniversitesi
Subjects: Nuclear physics, Physics, Luminosity (scattering theory), Electron–positron annihilation, Detector, Radiative transfer, High Energy Physics::Experiment, Limit (mathematics), Photon energy, Energy (signal processing)
Abstract: A search for the rare radiative leptonic decay Ds+??e+?e is performed for the first time using electron-positron collision data corresponding to an integrated luminosity of 3.19 fb-1, collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. No evidence for the Ds+??e+?e decay is seen, and an upper limit of B(Ds+??e+?e)0.01 GeV. © 2019 authors. Published by the American Physical Society.
Published: 2019

203. The students of the EEE Project in the footprints of Eratosthenes to measure the Earth radius

Author: M. Abbrescia, C. Avanzini, L. Baldini, R. Baldini Ferroli, G. Batignani, M. Battaglieri, S. Boi, E. Bossini, F. Carnesecchi, A. Chiavassa, C. Cicalo, L. Cifarelli, F. Coccetti, E. Coccia, A. Corvaglia, D. De Gruttola, S. De Pasquale, F. L. Fabbri, V. Frolov, L. Galante, P. Galeotti, M. Garbini, G. Gemme, I. Gnesi, S. Grazzi, C. Gustavino, D. Hatzifotiadou, P. La Rocca, G. Mandaglio, O. Maragoto Rodriguez, G. Maron, M. N. Mazziotta, S. Miozzi, R. Nania, F. Noferini, F. Nozzoli, F. Palmonari, M. Panareo, M. P. Panetta, R. Paoletti, W. Park, L. Perasso, F. Pilo, G. Piragino, S. Pisano, F. Riggi, G. C. Righini, C. Ripoli, M. Rizzi, G. Sartorelli, E. Scapparone, M. Schioppa, A. Scribano, M. Selvi, S. Serci, S. Squarcia, M. Taiuti, G. Terreni, A. Trifirò, M. Trimarchi, M. C. Vistoli, L. Votano, M. C. S. Williams, L. Zheng, A. Zichichi, R. Zuyeuski, Abbrescia, M., Avanzini, C., Baldini, L., Baldini Ferroli, R., Batignani, G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, D., De Pasquale, S., Fabbri, F. L., Frolov, V., Galante, L., Galeotti, P., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., La Rocca, P., Mandaglio, G., Maragoto Rodriguez, O., Maron, G., Mazziotta, M. N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M. P., Paoletti, R., Park, W., Perasso, L., Pilo, F., Piragino, G., Pisano, S., Riggi, F., Righini, G. C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, M. C., Votano, L., Williams, M. C. S., Zheng, L., Zichichi, A., and Zuyeuski, R.
Subjects: didactics, cosmic rays, earth radius
Abstract: One of the main goals of the school and research system is the education of future scientists. However, being hard to figure out what the daily life of a scientist is, it is mandatory for a high school student to evaluate a future university career, have chances to experience how a research activity is organized. The Extreme Energy Events (EEE) - La Scienza nelle scuole project plays, in this context, an essential role: involving high school students in a cosmic-ray experiment, offers them such an opportunity. The Project, coordinated by the Italian Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi” in Rome, is organized in different activities. Among them, annual meetings where students present their work and take part in initiatives finalized to increase their scientific knowledge. In this paper, one of such activities will be discussed, performed at the Fondazione e Centro di Cultura Scientifica “Ettore Majorana” in Erice on May 2017 and finalized to the measurement of the Earth radius with the Eratostene method.
Published: 2019

204. Amplitude analysis of Ds+ →π+π0η and first observation of the W-annihilation dominant decays Ds+ →a0 (980)+π0 and Ds+ →a0 (980)0π+

Author: M, Ablikim, M N, Achasov, S, Ahmed, M, Albrecht, M, Alekseev, A, Amoroso, F F, An, Q, An, J Z, Bai, Y, Bai, O, Bakina, R, Baldini Ferroli, Y, Ban, K, Begzsuren, J V, Bennett, N, Berger, M, Bertani, D, Bettoni, F, Bianchi, E, Boger, I, Boyko, R A, Briere, H, Cai, X, Cai, A, Calcaterra, G F, Cao, N, Cao, S A, Cetin, J, Chai, J F, Chang, G, Chelkov, G, Chen, H S, Chen, J C, Chen, M L, Chen, S J, Chen, X R, Chen, Y B, Chen, W, Cheng, X K, Chu, G, Cibinetto, F, Cossio, X F, Cui, H L, Dai, J P, Dai, A, Dbeyssi, D, Dedovich, Z Y, Deng, A, Denig, I, Denysenko, M, Destefanis, F, De Mori, Y, Ding, C, Dong, J, Dong, L Y, Dong, M Y, Dong, S X, Du, J, Fang, S S, Fang, Y, Fang, R, Farinelli, L, Fava, F, Feldbauer, G, Felici, C Q, Feng, M, Fritsch, C D, Fu, Q, Gao, X L, Gao, Y, Gao, Y G, Gao, Z, Gao, B, Garillon, I, Garzia, A, Gilman, K, Goetzen, L, Gong, W X, Gong, W, Gradl, M, Greco, M H, Gu, Y T, Gu, A Q, Guo, R P, Guo, Y P, Guo, A, Guskov, S, Han, X Q, Hao, F A, Harris, K L, He, X Q, He, F H, Heinsius, T, Held, Y K, Heng, Y R, Hou, Z L, Hou, H M, Hu, J F, Hu, T, Hu, Y, Hu, G S, Huang, J S, Huang, X T, Huang, Z L, Huang, T, Hussain, W, Ikegami Andersson, W, Imoehl, M, Irshad, Q, Ji, Q P, Ji, X B, Ji, X L, Ji, X S, Jiang, X Y, Jiang, J B, Jiao, Z, Jiao, D P, Jin, S, Jin, Y, Jin, T, Johansson, N, Kalantar-Nayestanaki, X S, Kang, R, Kappert, M, Kavatsyuk, B C, Ke, I K, Keshk, T, Khan, A, Khoukaz, P, Kiese, R, Kiuchi, R, Kliemt, L, Koch, O B, Kolcu, B, Kopf, M, Kuemmel, M, Kuessner, A, Kupsc, M, Kurth, M G, Kurth, W, Kühn, J S, Lange, P, Larin, L, Lavezzi, H, Leithoff, C, Li, Cheng, Li, D M, Li, F, Li, F Y, Li, G, Li, H B, Li, H J, Li, J C, Li, J W, Li, Jin, Li, K J, Li, Kang, Li, Ke, Li, L K, Li, Lei, Li, P L, Li, P R, Li, Q Y, Li, W D, Li, W G, Li, X L, Li, X N, Li, X Q, Li, Z B, Li, H, Liang, Y F, Liang, Y T, Liang, G R, Liao, L Z, Liao, J, Libby, C X, Lin, D X, Lin, B, Liu, B J, Liu, C X, Liu, D, Liu, D Y, Liu, F H, Liu, Fang, Liu, Feng, Liu, H B, Liu, H M, Liu, Huanhuan, Liu, Huihui, Liu, J B, Liu, J Y, Liu, K Y, Liu, Ke, Liu, L D, Liu, Q, Liu, S B, Liu, X, Liu, X Y, Liu, Y B, Liu, Z A, Liu, Zhiqing, Liu, Y F, Long, X C, Lou, H J, Lu, J G, Lu, Y, Lu, Y P, Lu, C L, Luo, M X, Luo, T, Luo, X L, Luo, S, Lusso, X R, Lyu, F C, Ma, H L, Ma, L L, Ma, M M, Ma, Q M, Ma, T, Ma, X N, Ma, X Y, Ma, Y M, Ma, F E, Maas, M, Maggiora, S, Maldaner, Q A, Malik, A, Mangoni, Y J, Mao, Z P, Mao, S, Marcello, Z X, Meng, J G, Messchendorp, G, Mezzadri, J, Min, R E, Mitchell, X H, Mo, Y J, Mo, C, Morales Morales, N Yu, Muchnoi, H, Muramatsu, A, Mustafa, Y, Nefedov, F, Nerling, I B, Nikolaev, Z, Ning, S, Nisar, S L, Niu, X Y, Niu, S L, Olsen, Q, Ouyang, S, Pacetti, Y, Pan, M, Papenbrock, P, Patteri, M, Pelizaeus, J, Pellegrino, H P, Peng, K, Peters, J, Pettersson, J L, Ping, R G, Ping, A, Pitka, R, Poling, V, Prasad, M, Qi, T Y, Qi, S, Qian, C F, Qiao, N, Qin, X S, Qin, Z H, Qin, J F, Qiu, S Q, Qu, K H, Rashid, C F, Redmer, M, Richter, M, Ripka, A, Rivetti, V, Rodin, M, Rolo, G, Rong, Ch, Rosner, A, Sarantsev, M, Savrié, K, Schoenning, W, Shan, X Y, Shan, M, Shao, C P, Shen, P X, Shen, X Y, Shen, H Y, Sheng, X, Shi, J J, Song, X Y, Song, S, Sosio, C, Sowa, S, Spataro, G X, Sun, J F, Sun, L, Sun, S S, Sun, X H, Sun, Y J, Sun, Y K, Sun, Y Z, Sun, Z J, Sun, Z T, Sun, Y T, Tan, C J, Tang, G Y, Tang, X, Tang, B, Tsednee, I, Uman, B, Wang, D, Wang, D Y, Wang, K, Wang, L L, Wang, L S, Wang, M, Wang, Meng, Wang, P, Wang, P L, Wang, W P, Wang, X L, Wang, Y, Wang, Y F, Wang, Z, Wang, Z G, Wang, Z Y, Wang, Zongyuan, Wang, T, Weber, D H, Wei, P, Weidenkaff, S P, Wen, U, Wiedner, M, Wolke, L H, Wu, L J, Wu, Z, Wu, L, Xia, Y, Xia, S Y, Xiao, Y J, Xiao, Z J, Xiao, Y G, Xie, Y H, Xie, X A, Xiong, Q L, Xiu, G F, Xu, J J, Xu, L, Xu, Q J, Xu, X P, Xu, F, Yan, L, Yan, W B, Yan, W C, Yan, Y H, Yan, H J, Yang, H X, Yang, L, Yang, R X, Yang, Y H, Yang, Y X, Yang, Yifan, Yang, Z Q, Yang, M, Ye, M H, Ye, J H, Yin, Z Y, You, B X, Yu, C X, Yu, J S, Yu, C Z, Yuan, Y, Yuan, A, Yuncu, A A, Zafar, Y, Zeng, B X, Zhang, B Y, Zhang, C C, Zhang, D H, Zhang, H H, Zhang, H Y, Zhang, J, Zhang, J L, Zhang, J Q, Zhang, J W, Zhang, J Y, Zhang, J Z, Zhang, K, Zhang, L, Zhang, T J, Zhang, X Y, Zhang, Y, Zhang, Y H, Zhang, Y T, Zhang, Yang, Zhang, Yao, Zhang, Yi, Zhang, Z H, Zhang, Z P, Zhang, Z Y, Zhang, G, Zhao, J W, Zhao, J Y, Zhao, J Z, Zhao, Lei, Zhao, Ling, Zhao, M G, Zhao, Q, Zhao, S J, Zhao, T C, Zhao, Y B, Zhao, Z G, Zhao, A, Zhemchugov, B, Zheng, J P, Zheng, Y H, Zheng, B, Zhong, L, Zhou, Q, Zhou, X, Zhou, X K, Zhou, X R, Zhou, Xiaoyu, Zhou, Xu, Zhou, A N, Zhu, J, Zhu, K, Zhu, K J, Zhu, S H, Zhu, W J, Zhu, X L, Zhu, Y C, Zhu, Y S, Zhu, Z A, Zhu, J, Zhuang, B S, Zou, and J H, Zou
Subjects: High Energy Physics - Experiment, NO
Abstract: We present the first amplitude analysis of the decay D_{s}^{+}→π^{+}π^{0}η. We use an e^{+}e^{-} collision data sample corresponding to an integrated luminosity of 3.19 fb^{-1} collected with the BESIII detector at a center-of-mass energy of 4.178 GeV. We observe for the first time the W-annihilation dominant decays D_{s}^{+}→a_{0}(980)^{+}π^{0} and D_{s}^{+}→a_{0}(980)^{0}π^{+}. We measure the absolute branching fraction B(D_{s}^{+}→a_{0}(980)^{+(0)}π^{0^{(}+)},a_{0}(980)^{+(0)}→π^{+(0)}η)=(1.46±0.15_{stat}±0.23_{sys})%, which is larger than the branching fractions of other measured pure W-annihilation decays by at least one order of magnitude. In addition, we measure the branching fraction of D_{s}^{+}→π^{+}π^{0}η with significantly improved precision.
Published: 2019

205. Observation of a resonant structure in e+e− → ωη and another in e+e− → ωπ0 at center-of-mass energies between 2.00 and 3.08 GeV

Author: J. Zhao, Z. A. Liu, X. Wang, F. De Mori, Magnus Wolke, Y. F. Liang, Y.T. Gu, V. Prasad, T. T. Han, Z.T. Sun, S. Marcello, Y. Zeng, Y. Ban, Xujin Yuan, P. Weidenkaff, F. H. Heinsius, X. L. Gao, T. Y. Xing, D. Y. Chen, W. Imoehl, S. B. Liu, R. Farinelli, J. G. Lu, S. J. Zhao, C.X. Liu, Z.Y. Deng, Y. P. Guo, H. J. Li, Stephen Lars Olsen, R. Kliemt, X. H. Xie, X. R. Zhou, D.H. Wei, G.F. Xu, Andrzej Kupsc, W.Y. Sun, M. L. Chen, T. Lenz, Y. B. Chen, Y. Fang, Z. Y. You, Z. A. Zhu, W. C. Yan, Gang Chen, R. S. Shi, Cheng Li, D. M. Li, Z. Y. Yuan, Xiaofeng Zhu, J. Z. Zhang, J. J. Song, R. Baldini Ferroli, Q. J. Xu, H. Liang, L. Sun, T. Weber, C. Dong, J.Y. Zhang, S. Sosio, M. Qi, F. Li, J.H. Yin, T. Hu, Z.Y. Wang, Zujian Wang, M. Pelizaeus, A. Bortone, Xuanhong Lou, S. Ahmed, C. W. Wang, M. Fritsch, Viktor Thorén, Nasser Kalantar-Nayestanaki, Y. Bai, H. J. Yang, Z. Ning, S. Y. Xiao, A. Yuncu, Jens Soeren Lange, C. P. Shen, L. J. Wu, X. Wu, S.A. Cetin, S. Nakhoul, M.N. Achasov, Yue Pan, O. Bakina, K. Liu, Tao Luo, J.H. Zou, Q. Liu, Y.Z. Sun, L. Yan, J. F. Hu, X.S. Kang, F.X. Lu, G.X. Sun, W. M. Song, Y. X. Tan, P. X. Shen, Z. Wu, L. Y. Dong, X.Q. Hao, Zhiyong Zhang, S. L. Yang, Ke Liu, Q. A. Malik, Zhenjun Xiao, A. Sarantsev, C.L. Luo, X. L. Lu, L. L. Ma, L. Gong, T. Liu, L. Koch, Libo Guo, L.L. Wang, Joachim Pettersson, L. G. Xia, A. Amoroso, J.L. Ping, J. Tang, B. Zhong, X. Y. Jiang, Shuai Liu, R.P. Guo, Jinfei Wu, M. M. Ma, Zhiqing Zhang, F. Feldbauer, X. L. Ji, Z.X. Meng, Yu Lu, P. Kiese, Yuan Hou, M. Rolo, H. Y. Zhang, B. X. Yu, L. Fava, Zhi Yang, L. M. Gu, Yunlong Zhang, A. Dbeyssi, L.H. Wu, R. A. Briere, J. J. Xu, L. P. Zhou, A. Calcaterra, H. B. Li, A. G. Denig, Q. Zhou, Y. J. Mo, R. B. de Boer, Guangyi Zhang, X.P. Qin, Feng Liu, N. Yu. Muchnoi, I. K. Keshk, C. X. Lin, F. F. Sui, M. Rump, M. H. Gu, D. C. Shan, Shan Jin, Xu Yan, Y. M. Ma, H. J. Lu, Z. H. Qin, X D Shi, Q. Ji, Y. J. Mao, R. Kiuchi, R. T. Ma, M. Y. Dong, Y. Zhang, X. S. Jiang, R. Poling, F.H. Liu, I. Denysenko, J. V. Bennett, H. Xiao, Ziyuan Li, Y. H. Zheng, C. X. Yu, Cong-Feng Qiao, B.S. Zou, X. N. Ma, J. B. Jiao, J. Fang, I.B. Nikolaev, G. Li, Jianping Zheng, A. Lavania, W. Shan, C. Zhong, B. Kopf, Z. Jiao, S. F. Zhang, I. Garzia, L. Zhang, R. X. Yang, Wei Xu, H. Muramatsu, A. N. Zhu, Ulrich Wiedner, Y.T. Liang, Tao Zhang, T. Holtmann, W.G. Li, B. Zheng, R. G. Ping, P. Adlarson, K. Peters, J. Y. Liu, M. Savrié, Y. K. Heng, Y.X. Zhao, H. S. Chen, G. Chelkov, Y. B. Zhao, Ch. Rosner, K. L. He, Junfeng Sun, Ziyi Wang, J. Dong, Zhiqing Liu, Q.M. Ma, T. J. Min, F.C. Ma, M. Ablikim, M. Z. Wang, A. Rivetti, M. Bertani, M. Albrecht, Y. H. Zhang, M. Kavatsyuk, Jianyu Zhang, Huihui Liu, H. L. Dai, T. Z. Han, J. Q. Zhang, J. G. Messchendorp, H. C. Shi, Q. Zhao, G. Felici, C.H. Li, S. S. Sun, K. Zhu, M. Kuemmel, Matthew Glenn Kurth, M.H. Ye, Jimin Zhao, X. Y. Shen, P.R. Li, S. Nisar, C. J. Tang, T. Johansson, J. F. Chang, X. Liu, J. Libby, Y. F. Wang, P. L. Li, Y. F. Long, X.R. Chen, K. Ravindran, W. D. Li, O.B. Kolcu, Xu Shan, X. L. Luo, L. Lavezzi, J. P. Dai, Q.P. Ji, M. Destefanis, X. S. Qin, Y. P. Lu, C.D. Fu, D. Dedovich, X. H. Mo, W. Kühn, X. F. Cui, B. Wang, M. Greco, L.Q. Qin, H. R. Qi, X. Cai, C. F. Redmer, J. D. Lu, B.X. Zhang, B. T. Tsednee, C. Schnier, D. Bettoni, L. Z. Liao, Meng Wang, Muhammad Irshad, L. Yang, X. Pan, Y. G. Xie, Ke Wang, C. Li, M. G. Zhao, Y. H. Yang, M. H. Ye, X. X. Ma, J. Zhu, A. Pitka, Y. Ding, Xiongfei Wang, G. Cibinetto, Yi Zhang, R. E. Mitchell, Yan Zhang, Y. K. Sun, Z. Huang, S. Spataro, X. P. Xu, H. B. Jiang, Jiawei Zhang, J. L. Li, John Jake Lane, X. T. Huang, G. S. Huang, Evelina Gersabeck, S. Lusso, H.L. Ma, Guoqiang Yu, G. Rong, S. Q. Qu, Z. B. Li, W. Ikegami Andersson, P. Larin, S. Zhang, I. Balossino, X. Zhou, Y. Fu, Bibo Ke, M. X. Luo, Dylan Jaide White, S. X. Du, W. Gradl, H. Cai, F. A. Harris, W. L. Chang, W. B. Yan, Y. Hu, K. Schoenning, Y. Gao, L. Q. Huang, W. J. Zhu, Jacek Biernat, Y. Schelhaas, X. D. Shi, Y. X. Song, D. Y. Wang, Lei Li, B. L. Wang, H. M. Liu, Y. Jin, H. Leithoff, S. Han, T. Hussain, L. Zhao, I. Boyko, Niklaus Berger, Lei Zhang, X. Y. Ma, W. X. Gong, Y. Nefedov, A. Khoukaz, Ruiting Ma, M. Shao, A. Pathak, S. Pacetti, Z. Qian, G. F. Cao, N. Huesken, Y. C. Zhu, Xiao-Rui Lyu, S. Malde, R. Kappert, B.J. Liu, Y. H. Tan, Ke Li, Haiping Peng, Z. G. Zhao, T. Held, K. Begzsuren, Y. G. Gao, W. H. Wang, H. H. Zhang, Q. Q. Song, S. Gu, Fang Liu, C.X. Yue, S.P. Wen, M. Lellmann, S. Maldaner, Y. J. Xiao, J. Q. Li, A. Q. Guo, Y.Q. Wang, S. Janchiv, J.F. Qiu, X. A. Xiong, L. D. Liu, W. P. Wang, F. Bianchi, J. Bloms, A. A. Zafar, K. H. Rashid, Y.D. Wang, Z.P. Mao, S. Qian, Q. An, A. Guskov, S. J. Chen, X. Y. Zhang, X. L. Wang, J. B. Liu, Y. J. Sun, Yifan Yang, D. Y. Liu, Zongyuan Wang, F. Weidner, Y. Yuan, W. L. Yuan, Q. Ouyang, S. S. Fang, C. Y. Guan, F. Nerling, Y. B. Liu, J.L. Zhang, Huanhuan Liu, F.E. Maas, Dong E. Liu, X. H. Li, L. Wollenberg, Xingchao Dai, Si Li, M. Kuessner, Tao Sun, Y. H. Xie, M. Maggiora, Lei Zhao, K. Goetzen, C. Z. Yuan, N. Cao, A. Zhemchugov, P. W. Luo, I. Uman, L. K. Li, P. Patteri, S. Jaeger, H.X. Yang, H.B. Liu, V. Rodin, Y.X. Yang, X. B. Ji, K.Y. Liu, Bingxuan Liu, G. Wilkinson, M. Himmelreich, G. Y. Tang, W. S. Cheng, Yao Zhang, S.H. Zhu, A. Gilman, Guang Zhao, F. Cossio, Jie Zhao, C. Q. Feng, Hai-Tian Wang, Z.L. Hou, Xingguo Li, H. M. Hu, A. Mangoni, Jie Yu, G. Mezzadri, K. J. Zhu, J. W. Zhang, T. Y. Qi, T. Yu, X. K. Zhou, Wenbin Qian, Nuclear Energy, Research unit Nuclear & Hadron Physics, and Energy and Sustainability Research Institute Groni
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, BESIII, Excited ρ states, Excited ω states, 01 natural sciences, Resonance (particle physics), lcsh:QC1-999, NO, law.invention, Nuclear physics, law, 0103 physical sciences, ϕ(2170), Center of mass, 010306 general physics, Collider, lcsh:Physics
Abstract: Born cross sections for the processes e + e − → ω η and e + e − → ω π 0 have been determined for center-of-mass energies between 2.00 and 3.08 GeV with the BESIII detector at the BEPCII collider. The results obtained in this work are consistent with previous measurements but with improved precision. Two resonant structures are observed. In the e + e − → ω η cross sections, a resonance with a mass of ( 2176 ± 24 ± 3 ) MeV / c 2 and a width of ( 89 ± 50 ± 5 ) MeV is observed with a significance of 6.2σ. Its properties are consistent with the ϕ ( 2170 ) . In the e + e − → ω π 0 cross sections, a resonance denoted Y ( 2040 ) is observed with a significance of more than 10σ. Its mass and width are determined to be ( 2034 ± 13 ± 9 ) MeV / c 2 and ( 234 ± 30 ± 25 ) MeV , respectively, where the first uncertainties are statistical and the second ones are systematic.
Published: 2021

206. Standalone codes for simulation and reconstruction of a triple-GEM: GTS and GRAAL

Author: A. Calcaterra, E. Tskhadadze, S. Cerioni, G. Mezzadri, R. Farinelli, R. Malaguti, M. Greco, R. Baldini Ferroli, S. Marcello, A. Amoroso, S. Spataro, G. Felici, S. Sosio, S. Lusso, J. Y. Chai, S. Chiozzi, M. Da Rocha Rolo, G. Cotto, F. Evangelisti, P. Patteri, Marco Mignone, L. Fava, Angelo Rivetti, F. De Mori, H. J. Li, M. Maggiora, D. Bettoni, S. Pacetti, M.G. Alexeev, B. Passalacqua, Stefano Bagnasco, I. Garzia, F. Bianchi, M. Bertani, Giuseppe Giraudo, M. Destefanis, Richard Wheadon, A. Cotta Ramusino, I. Balossino, M. Gatta, A. Bortone, F. Cossio, S. Gramigna, L. Gaido, Li Yan, M. Savrie, L. Lavezzi, M. Melchiorri, A. Mangoni, G. Cibinetto, and W. S. Cheng
Subjects: History, Physics::Instrumentation and Detectors, Computer science, Centroid, Experimental data, STRIPS, Tracking (particle physics), Signal, Computer Science Applications, Education, law.invention, law, Position (vector), Ionization, Cluster (physics), Algorithm
Abstract: The experiment BESIII, running at the accelerator BEPCII in Beijing (P.R.C.), is going to be updated with the replacement of the Inner Drift Chamber with a Cylindrical triple-GEM Inner Tracker (CGEM-IT). In the R&D stage, two standalone C++ codes were implemented: GTS (Garfield-based Triple-GEM Simulator), for digitization and tuning of simulated data to the experimental ones, and GRAAL (GEM Reconstruction And Analysis Library), for the reconstruction and analysis of the experimental events collected in testbeams. GTS simulates the triple-GEM response to the particle passage, treating each stage separately: ionization, GEM properties, gas mixture, magnetic field and finally the induction of the signal on the anode. The necessary information was extracted by GARFIELD++ simulations, parametrized and used as input in GTS. This speeds up the simulation, since GTS performs only samplings instead of the full digitization chain. The simulated events were reconstructed with the same procedure used for experimental data and tuning factors were evaluated to obtain a satisfactory match. GRAAL is used in the analysis of the testbeam experimental data. It provides several levels of reconstruction: from the cluster formation, gathering contiguous firing strips, to the spatial position and the signal time reconstruciton. Two algorithms are used: the charge centroid and the micro-TPC, which exploit the charge deposition on the strips and the time information. Also a merging of the two algorithms is available to efficiently weight the two outcomes and obtain the best estimate of the spatial coordinate. Moreover, GRAAL performs tracking and alignment. Both codes are going to be made available also for other MPGDs simulation and reconstruction.
Published: 2020

207. A Monte Carlo triple-GEM simulation tuned with data

Author: J. Pellegrino, M. Maggiora, I. Garzia, E. Soldani, F. De Mori, G. Mezzadri, D. Bettoni, R. Farinelli, G. Felici, M. Destefanis, E. Tskhadadze, J. Dong, G. Cotto, F. Evangelisti, Marco Mignone, S. Sosio, S. Spataro, H. J. Li, A. Calcaterra, Giuseppe Giraudo, S. Pacetti, R. Baldini Ferroli, A. Amoroso, M. Greco, Angelo Rivetti, L. Lavezzi, A. Mangoni, M. Melchiorri, V. Cassariti, Li Yan, F. Cossio, S. Marcello, L. Fava, W. L. Yuan, J. Y. Chai, I. Balossino, Cy. Leng, G. Cibinetto, A. Pelosi, M. Bertani, Gianfranco Morello, A. Bortone, W. S. Cheng, F. Bianchi, M. Capodiferro, M. Da Rocha Rolo, P. Patteri, S. Chiozzi, M.G. Alexeev, E. Fioravanti, S. Verma, Richard Wheadon, A. Cotta Ramusino, S. Cerioni, R. Malaguti, M. Gatta, N. Canale, and M. Savrie
Subjects: Physics, Field (physics), Physics::Instrumentation and Detectors, law, Ionization, Monte Carlo method, Detector, CPU time, STRIPS, Electron, Diffusion (business), law.invention, Computational physics
Abstract: Triple-GEM detectors are a well known technology used in high energy physics experiments. A reliable Monte Carlo simulation has to be developed to reproduce the performance which have been measured experimentally, for example in beam tests, and be able to infer the future behavior in real conditions. In detail, the software has to simulate the response of the detector to the passage of particles, from the primary ionization, to the amplification and diffusion of the electrons and eventually to the induction of the charge on the anode strips. In the case of gas detectors, existing softwares such as GARFIELD++ already perform a very detailed simulation of the physical processes but are CPU time consuming. In this presentation a description of a faster simulation is presented. It models the results about the electron production (primary ionization and avalanche) and diffusion in a triple-GEM obtained from GARFIELD++ and then it reconstructs the signal induced on each anode strip according to the Shockley-Ramo theorem. The simulation has been tuned on the data collected in several beam tests and it can reproduce the real values of time and charge measured by the strip. When the reconstruction algorithms used in the field of Micro Pattern Gas Detectors, such as the Charge Centroid or the micro-Time Projection Chamber readout, are applied on the simulated data, the model shows performance comparable to the experimental one. This provides a validation of this model and allows to extend its usage in different conditions, i.e. geometries, presence of magnetic field, high voltage settings, different direction of the incident particles, to evaluate the expected outcome of the triple-GEM in those cases.
Published: 2018

208. Optimization of the reconstruction algorithm in triple-GEM detector

Author: M. Savrie, W. S. Cheng, J. Pellegrino, S. Marcello, M. Maggiora, R. Baldini Ferroli, J. Y. Chai, S. Chiozzi, F. De Mori, M. Greco, J. Dong, S. Sosio, V. Cassariti, E. Soldani, M.G. Alexeev, Marco Mignone, R. Farinelli, M. Capodiferro, A. Calcaterra, M. Bertani, P. Patteri, Li Yan, A. Amoroso, A. Bortone, A. Pelosi, F. Bianchi, Cy. Leng, L. Fava, G. Mezzadri, Angelo Rivetti, A. Mangoni, S. Cerioni, Giuseppe Giraudo, F. Cossio, R. Malaguti, M. Melchiorri, G. Felici, G. Cotto, F. Evangelisti, G. Cibinetto, D. Bettoni, E. Fioravanti, S. Verma, S. Pacetti, H. J. Li, N. Canale, M. Destefanis, W. L. Yuan, S. Spataro, Richard Wheadon, A. Cotta Ramusino, M. Gatta, L. Lavezzi, Gianfranco Morello, I. Garzia, E. Tskhadadze, M. Da Rocha Rolo, and I. Balossino
Subjects: Micro Pattern Gas Detectors, Physics::Instrumentation and Detectors, Electron, 01 natural sciences, Capacitance, NO, 030218 nuclear medicine & medical imaging, μTPC, 03 medical and health sciences, 0302 clinical medicine, Optics, 0103 physical sciences, Gas detector, Reconstruction algorithms, Image resolution, Physics, GEM, tracking detectors, 010308 nuclear & particles physics, business.industry, Detector, Reconstruction algorithm, Charged particle, Gas electron multiplier, business
Abstract: Gas detectors are very light instruments used in high energy physics to measure the particle properties: position and momentum. Gas Electron Multiplier (GEM) technology has been invented by F. Sauli in 1997 and in the past tens of years the knowledge of this Micro Pattern Gas Detector (MPGD) increased. A design with a triple-GEM has been used in several experiments in high energy physics such as TOTEM and COMPASS. This technology allows to achieve good spatial resolution performances and can be used to create large area detector with a shapeable surface, e.g. the KLOE2 Inner Tracker or the upcoming upgrade of the BESIII Inner Tracker. A triple-GEM uses three stages of GEMs, with high electric field, to amplify the number of the electrons produced by the primary ionization of the charged particle passing in the gas, with a total gain of about 104. The signal is then collected on a segmented anode and dedicated algorithms are used to reconstruct the charged particle position. The measurement of both the time and the charge information on the anode strip allows to use two algorithms: the Charge Centroid and the micro-Time Projection Chamber readout. The CC is strongly performing with orthogonal tracks while the µTPC gives its best results if magnetic field or if non-orthogonal tracks are present. These reconstruction methods are anti-correlated and the combination of the two is needed to keep the spatial resolution stable between the regions with different performances. A beam test with planar triple-GEM has been performed and in this presentation the merging algorithm of the CC and µTPC as a function of the charge and the multiplicity of the signal will be shown: a stable spatial resolution of about 130 µm has been achieved. In addition to this, the impact of the transversal and longitudinal diffusions on the reconstruction in µTPC mode will be shown, as well as the inter-strip capacitance effect.
Published: 2018

209. Measurement of the Branching Fraction For the Semileptonic Decay D0(+)→π−(0)μ+νμ and Test of Lepton Flavor Universality

Author: J. Pellegrino, M. Qi, H. J. Yang, M. Maggiora, Ling Zhao, W. M. Song, Krisztian Peters, F. De Mori, Lei Zhao, Z. L. Hou, Meng Wang, X. Y. Zhou, R. Poling, M. Albrecht, Y. Ding, G. R. Liao, Michael Papenbrock, Q. A. Malik, G. Mezzadri, X. Q. He, B. J. Liu, B. Q. Wang, B. X. Yu, Jun-Yi Zhang, D. Bettoni, Y. P. Guo, X. F. Wang, S. B. Liu, Z. J. Xiao, L. P. Zhou, Z. P. Zhang, W. Kühn, X. L. Ji, C. Z. Yuan, Y. M. Ma, Z. P. Mao, Minglin Ma, P. L. Chen, Zhi Zeng, Z. Y. You, Z. A. Zhu, D. W. Bennett, Zujian Wang, Q. M. Ma, H. Cai, M. Kuhlmann, Y. Bai, J. Fang, X. K. Zhou, Fang Liu, F. F. An, Z. Gao, A. Mustafa, C. P. Shen, Y. J. Mao, I. Denysenko, W. C. Yan, P. L. Wang, H. X. Yang, J. Min, P. Musiol, C. F. Redmer, J. F. Chang, I. Garzia, Ch. Rosner, M. Kuemmel, C. Schnier, Y. Yuan, Y. S. Zhu, M. Bertani, Yu Zhang, Magnus Wolke, Y. F. Liang, B. Y. Zhang, X. L. Luo, D. P. Jin, C. Sowa, Y. B. Zhao, W. Shan, J. Dong, Y. F. Wang, X. T. Huang, X. H. Mo, X. N. Ma, Y. Q. Wang, Huihui Liu, S. Nisar, C. J. Tang, L. S. Wang, Y. Hu, M. H. Ye, Y. P. Lu, Z. A. Liu, F. Bianchi, M. H. Gu, D. Xiao, X. Y. Jiang, J. C. Chen, Igor Boyko, J. V. Bennett, Zahra Haddadi, B. Kopf, Dayong Wang, N. Qin, J. P. Liu, Y. Pan, J. Chai, H. Y. Sheng, G. X. Sun, Z. G. Wang, J. G. Messchendorp, H. Y. Zhang, X. Y. Niu, Z. Jiao, Fu-Hu Liu, D. H. Zhang, H. J. Lu, J. G. Lu, T. Hussain, X. Y. Ma, T. Holtmann, Haiwen Liu, Y. X. Xia, S. H. Zhu, Y. Ban, L. J. Wu, C. X. Yu, Q. Liu, M. Fritsch, W. X. Gong, Y. J. Mo, Y. G. Xie, Kai Liu, X. Tang, Guangshun Huang, Qiunan Xu, H. Liang, F. A. Harris, Dan Wang, L. Yan, M. Kuessner, F. E. Maas, T. Hu, A. Yuncu, M. Rolo, Xiaozhong Huang, J. Y. Liu, S. Qian, Jialun Ping, A. Amoroso, K. Zhang, B. Zheng, A. Dbeyssi, K. L. He, Bibo Ke, H. Leithoff, R. G. Ping, L. Zhang, Y. Nefedov, J. F. Sun, O. Bakina, Andrzej Kupsc, M. Kavatsyuk, M. N. Achasov, H. S. Chen, T. Weber, S. X. Du, Q. P. Ji, W. B. Yan, X. Y. Zhang, L. L. Wang, Y. H. Zheng, Ke Wang, Cong-Feng Qiao, X. H. Sun, L. L. Ma, L. Gong, S. Marcello, X. R. Chen, M. Lara, Y. J. Sun, F. Li, J. Y. Zhang, F. C. Ma, Jianhao Zhang, A. Calcaterra, Z. L. Dou, Q. Gao, Y. N. Gao, K. J. Zhu, M. Z. Wang, Jimin Zhao, S. L. Niu, S. Pacetti, Liqing Xu, X. Y. Shen, P. X. Shen, Z. Wu, Y. Zeng, N. Yu. Muchnoi, X. S. Kang, Ke Liu, M. Richter, Z. Ning, J. J. Xu, Y. H. Zhang, Gueorgui Chelkov, F. Y. Li, X. Q. Li, Y. F. Long, Y. X. Zhou, M. Greco, B. X. Zhang, P. F. Duan, Zhiqing Zhang, A. Q. Guo, G. Rong, Ke Li, M. Y. Dong, Peilian Liu, Cui Li, J. S. Huang, Xiaofeng Zhu, J. Z. Zhang, P. L. Li, Yaquan Fang, J. F. Qiu, L. Fava, T. Khan, W. D. Li, Zongyuan Wang, X. Liu, B. L. Wang, A. Pitka, C. X. Liu, Z. Y. Wang, Yi Chen, J. J. Song, Zhiyong Zhang, L. Sun, Z. T. Sun, X. K. Chu, G. Cibinetto, M. Tiemens, C. Leng, Yunlong Zhang, H. R. Qi, H. B. Liu, T. C. Zhao, B. T. Tsednee, Xiao-Rui Lyu, S. Ahmed, Y. X. Yang, Jin Li, P. Weidenkaff, F. H. Heinsius, Kang Li, R. A. Briere, A. Julin, J. Z. Bai, F. Feldbauer, K. Schoenning, Q. Y. Li, B. S. Zou, J. L. Zhang, Yang Zhang, K. Y. Liu, Niklaus Berger, Serkant Ali Cetin, Jianping Zheng, S. P. Wen, X. R. Zhou, J. H. Zou, Cheng Li, Z. B. Li, W. Ikegami Andersson, S. Zhu, X. Cai, S. S. Sun, K. Goetzen, W. P. Wang, J. Q. Zhang, Z. L. Huang, D. Y. Liu, J. B. Jiao, Y. G. Gao, Feng Liu, J. Zhu, L. Koch, A. Khoukaz, Orhan Cakir, Q. Zhao, P. Kiese, Dmitri Dedovich, Z. H. Qin, Y. Z. Sun, Yuekun Heng, G. S. Varner, M. G. Zhao, Y. H. Yang, R. P. Guo, R. Baldini Ferroli, G. Y. Tang, H. L. Dai, X. S. Qin, S. L. Olsen, Q. Ouyang, S. S. Fang, Xiang Zhou, M. Destefanis, W. G. Li, Jie Zhao, X. L. Gao, D. X. Lin, S. Q. Zhang, X. S. Jiang, Alexey Zhemchugov, H. M. Hu, I. Tapan, Y. H. Yan, Y. K. Sun, R. E. Mitchell, L. Yang, J. B. Liu, L. D. Liu, J. W. Zhao, L. Y. Dong, Q An, J. M. Bian, Gang Zhao, C. Dong, S. Sosio, S. Spataro, X. P. Xu, S. J. Zhao, Y. C. Zhu, Y. B. Liu, X. N. Li, Yao Wang, Haiping Peng, Joachim Pettersson, Q. J. Xu, Lei Li, I. Uman, Xuanhong Lou, R. Farinelli, H. Xiao, E. Boger, T. Held, Nasser Kalantar-Nayestanaki, Huanhuan Liu, G. F. Xu, C. Morales Morales, G. Felici, P. Larin, G. F. Cao, F. Nerling, H. L. Ma, D. M. Li, Zhiqing Liu, W. Gradl, M. Ripka, J. P. Dai, Z. G. Zhao, S. Fegan, I. B. Nikolaev, X. Y. Song, T. Johansson, H. J. Li, J. H. Yin, O. B. Kolcu, M. Pelizaeus, M. Shao, Y. T. Gu, Q. L. Xiu, H. H. Zhang, D. Y. Wang, L. Lavezzi, Z. J. Sun, X. Q. Hao, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, J. C. Li, J. Zhuang, A. Denig, M. X. Luo, M. L. Chen, H. B. Li, C. L. Luo, C. C. Zhang, B. Zhong, H. Muramatsu, Ulrich Wiedner, M. Kornicer, T. Ma, Z. Y. Deng, Z. X. Meng, X. A. Xiong, A. A. Zafar, K. H. Rashid, Y. T. Liang, K. J. Li, V. Prasad, S. Han, Yi-Tao Wang, L. H. Wu, M. Savrie, Yi Jin, L. Xia, Y. J. Xiao, Bingxuan Liu, S. Jin, Yao Zhang, G. Li, M. Ablikim, Sai-Juan Chen, C. D. Fu, C. Q. Feng, Xingguo Li, X. B. Ji, P. Patteri, R. Kliemt, Jie Yu, Guo-Ming Chen, T. J. Min, and Y. H. Xie
Subjects: Semileptonic decay, Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Pi, General Physics and Astronomy, 010306 general physics, 01 natural sciences, Flavor, Lepton
Abstract: Using a data sample corresponding to an integrated luminosity of 2.93 fb(-1) taken at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we perform an analysis of the semileptonic decays D0(+) -> pi(-(0))mu(+)nu(mu ). The branching fractions of D-0 -> pi(-)mu(+)nu(mu), and D+ -> pi(0)mu(+)nu(mu ) are measured to be (0.272 +/- 0.008(start) +/- 0.006(syst))% and (0.350 +/- 0.011(star) +/- 0.010(syst))%, respectively, where the former is of much improved precision compared to previous results and the latter is determined for the first time. Using these results along with previous BESIII measurements of D0(+) -> pi(-(0))e(+)nu(e), we calculate the branching fraction ratios to be R-0 BD0 -> pi(-)mu(+)nu mu BD0 -> pi(-)e(+)nu e=0.922 +/- 0.030(start) +/- 0.022(syst) and R+ BD+ -> pi(0)mu(+)nu mu/BD+ -> pi(0)e(+)nu e= 0.964 +/- 0.037(start) +/- 0.026(syst), which arc compatible with the theoretical expectation of lepton flavor universality within 1.7 sigma and 0.5 sigma, respectively. We also examine the branching fraction ratios in different four-momentum transfer square regions, and find no significant deviations from the standard model predictions.
Published: 2018

210. Observation of h1(1380) in the J/ψ→η′KK¯π decay

Author: J. Min, M. Y. Dong, M. Tiemens, H. B. Liu, M. M. Ma, S. B. Liu, B. Kopf, Y. Nefedov, J. H. Zou, K. L. He, S. S. Sun, S. W. Han, Y. H. Xie, J. Pellegrino, Zahra Haddadi, M. Maggiora, Jimin Zhao, Ling Zhao, P. L. Li, Lei Zhao, Z. L. Hou, C. F. Redmer, R. E. Mitchell, J. Chai, G. X. Sun, J. V. Bennett, Li Yan, M. Bertani, L. Yang, C. Z. Yuan, K. Goetzen, Z. Jiao, D. H. Zhang, M. Kuhlmann, Z. Gao, Bibo Ke, W. B. Yan, S. L. Niu, X. Q. Li, Y. F. Long, Jun-Yi Zhang, M. G. Zhao, Y. H. Yang, R. P. Guo, J. Zhu, S. Pacetti, Z. P. Zhang, Zongyuan Wang, Ke Li, W. Gradl, D. W. Bennett, T. Holtmann, Zujian Wang, K. Y. Liu, Fang Liu, L. J. Wu, D. Y. Wang, Z. B. Li, U. Wiedner, I. Denysenko, J. M. Bian, S. J. Zhao, M. Kuessner, W. Ikegami Andersson, B. J. Liu, Q. A. Malik, G. Mezzadri, Y. J. Mo, Q. Ouyang, B. Y. Zhang, W. C. Yan, Q. J. Xu, Y. F. Wang, L. H. Wu, Xiaozhong Huang, J. Y. Liu, X. Q. He, S. S. Fang, G. Y. Tang, J. C. Chen, Xuanhong Lou, M. N. Achasov, Nasser Kalantar-Nayestanaki, T. Hussain, C. Sowa, Y. B. Zhao, M. Savrie, G. R. Liao, Y. B. Liu, X. Y. Ma, C. Morales Morales, W. Shan, Yue Pan, Manuel Lara, W. X. Gong, Andrzej Kupsc, Y. H. Zheng, M. Qi, H. J. Yang, Cong-Feng Qiao, J. Dong, G. A. Chelkov, L. D. Liu, Jie Zhao, D. X. Lin, L. P. Zhou, Z. G. Wang, B. Q. Wang, Huanhuan Liu, G. Felici, H. Y. Zhang, Y. M. Ma, S. Nisar, Yi Jin, Alexey Zhemchugov, H. M. Hu, M. L. Chen, Z. P. Mao, I. Tapan, C. J. Tang, Y. H. Yan, Y. Hu, Y. P. Lu, G. F. Chen, Q. P. Ji, W. G. Li, A. G. Denig, J. F. Sun, J. Y. Zhang, N. Yu. Muchnoi, Q. Liu, Tristan Weber, Y. K. Sun, F. H. Liu, Nicolas Berger, I. R. Boyko, C. H. Li, X. H. Sun, Y. J. Xiao, X. S. Kang, Y. H. Zhang, J. Fang, S. Marcello, Y. Zeng, D. Xiao, J. J. Xu, I. Uman, Zhe Sun, Q. Gao, Y. N. Gao, J. W. Zhao, Liqing Xu, Y. K. Heng, P. Kiese, J. W. Zhang, X. Y. Shen, Z. J. Xiao, Z. X. Meng, X. A. Xiong, Ch. Rosner, S. L. Olsen, L. L. Ma, Yao Zhang, L. Gong, H. J. Li, B. X. Yu, G. Li, R. A. Briere, Y. Ding, Y. C. Zhu, A. Pitka, Y. B. Chen, P. L. Chen, Xiaofeng Zhu, J. Z. Zhang, S. Spataro, G. S. Huang, X. S. Jiang, Y. X. Zhou, J. J. Song, Zhi Zeng, L. Sun, Q. L. Xiu, Z. Y. Wang, C. Leng, H. Liang, A. A. Zafar, Z. A. Liu, P. L. Wang, F. Y. Li, L. G. Xia, A. Amoroso, J. S. Huang, X. L. Luo, W. Kühn, H. S. Chen, Alperen Yuncu, Jin Li, Magnus Wolke, M. Kuemmel, Z. Y. You, Z. A. Zhu, Y. F. Liang, C. X. Liu, D. P. Jin, C. D. Fu, H. L. Dai, K. H. Rashid, Y. X. Xia, O. Cakir, L. Koch, W. P. Wang, A. Dbeyssi, Dayong Wang, N. Qin, X. K. Zhou, A. Khoukaz, X. H. Liu, F. Li, R. Baldini Ferroli, F. Bianchi, Ke Liu, H. M. Liu, S. Ahmed, Y. X. Yang, C. P. Shen, H. Xiao, Kang Li, C. Q. Feng, X. R. Chen, Z. Y. Deng, M. Ripka, F. C. Ma, V. Prasad, Krisztian Peters, M. Z. Wang, M. Kornicer, Y. T. Liang, Dan Wang, J. P. Dai, Yaquan Fang, X. N. Li, Shou-hua Zhu, T. Held, D. Y. Liu, Mario Greco, G. F. Cao, Y. G. Gao, Haiping Peng, A. Julin, F. De Mori, X. Q. Hao, J. Q. Zhang, Ke Wang, S. J. Chen, S. Q. Zhang, X. Y. Zhou, Xingguo Li, Zhiqing Liu, K. J. Li, Y. J. Mao, R. Poling, P. F. Duan, F. H. Heinsius, H. X. Yang, Fenfen An, I. Garzia, K. Schoenning, Q. Y. Li, B. S. Zou, B. L. Wang, Q. Zhao, P. Larin, Y. Z. Sun, H. J. Lu, J. G. Lu, T. C. Zhao, X. F. Wang, T. Johansson, J. F. Chang, Q. M. Ma, J. Z. Bai, O. B. Kolcu, G. F. Xu, A. Mustafa, F. E. Maas, T. Hu, X. Y. Niu, X. Cai, Gang Zhao, S. Jin, L. Lavezzi, Huihui Liu, Y. Yuan, Y. S. Zhu, Yu Zhang, J. P. Liu, Y. Ban, O. Bakina, J. F. Qiu, M. Papenbrock, J. G. Messchendorp, Qiunan Xu, M. Richter, Z. H. Wang, Z. Ning, A. Q. Guo, P. X. Shen, Z. Wu, W. M. Song, L. Fava, Zhiqing Zhang, Z. H. Qin, P. Musiol, X. P. Xu, X. B. Ji, R. Farinelli, P. Weidenkaff, F. Nerling, C. Schnier, Y. Q. Wang, P. Patteri, X. Y. Song, X. T. Huang, Yang Zhang, H. L. Ma, R. Kliemt, D. M. Li, G. Rong, Jie Yu, T. J. Min, K. J. Zhu, M. Albrecht, G. Cibinetto, W. D. Li, H. Muramatsu, B. T. Tsednee, M. Pelizaeus, Meng Wang, S. P. Wen, X. S. Qin, X. R. Zhou, Cheng Li, F. A. Harris, H. Leithoff, S. Qian, Q. An, Jialun Ping, K. Zhang, X. Y. Zhang, J. B. Liu, Y. J. Sun, E. Boger, X. K. Chu, J. B. Jiao, H. R. Qi, Y. P. Guo, Serkant Ali Cetin, Peilian Liu, Lingxuan Zhang, J. C. Li, M. H. Gu, J. Zhuang, M. X. Luo, H. Y. Sheng, D. V. Dedovich, C. X. Yu, H. B. Li, C. L. Luo, B. Zheng, R. G. Ping, C. C. Zhang, B. Zhong, Lei Li, T. Ma, Yunlong Zhang, A. Calcaterra, Z. G. Zhao, S. Fegan, Yu Bai, H. H. Zhang, Z. J. Sun, X. L. Ji, D. Bettoni, J. L. Zhang, Jianping Zheng, S. Zhu, Z. Y. Zhang, X. H. Mo, L. S. Wang, M. H. Ye, S. X. Du, Y. G. Xie, L. L. Wang, H. Cai, Z. L. Dou, Yao Wang, Xiao-Rui Lyu, L. Y. Dong, G. S. Varner, M. Destefanis, I. B. Nikolaev, J. H. Yin, M. Shao, Y. T. Gu, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, X. Tang, T. Khan, M. Rolo, F. Feldbauer, Z. L. Huang, Feng Liu, M. Ablikim, X. Y. Jiang, X. N. Ma, X. L. Gao, M. Fritsch, M. Kavatsyuk, C. Dong, S. Sosio, B. X. Zhang, and Joachim Pettersson
Subjects: Physics, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, Isospin, 0103 physical sciences, Analytical chemistry, Pi, 010306 general physics, 01 natural sciences
Abstract: Using 1.31 x 10(9) J/psi events collected by the BESIII detector at the BEPCII e(+)e(-) collider, we report the first observation of the h(1)(1380) in J/psi -> eta'h(1)(1380) with a significance of more than ten standard deviations. The mass and width of the possible axial-vector strangeonium candidate h(1)(1380) are measured to be M = (1423.2 +/- 2.1 +/- 7.3) MeV/c(2) and Gamma = (90.3 +/- 9.8 +/- 17.5) MeV. The product branching fractions, assuming no interference, are determined to be B(J/psi -> eta'h(1)(1380)) x B(h(1)(1380) -> K*(892)K-+(-)+c.c.) = (1.51 +/- 0.09 +/- 0.21) x 10(-4) in eta'K+K-pi(0) mode and B(J/psi -> eta'h(1)(1380)) x B(h(1)(1380) -> K*(892)(K) over bar +c.c.) =(2.16 +/- 0.12 +/- 0.29) x 10(-4) in eta'(KSK +/-)-K-0 pi(-/+) mode. The first uncertainties are statistical and the second are systematic. Isospin symmetry violation is observed in the decays h(1)(1380) K*(892)K-+(-) + c.c. and h(1)(1380) -> K*(892)(0)(K) over bar (0) + c.c.. Based on the measured h(1)(1380) mass, the mixing angle between the states h(1)(1170) and h(1)(1380) is determined to be (35.9 +/- 2.6)degrees, consistent with theoretical expectations.
Published: 2018

211. First measurement of e+e−→pKS0n¯K−+c.c. above open charm threshold

Author: Bibo Ke, W. B. Yan, Karin Schönning, D. Y. Liu, J. B. Jiao, R. Farinelli, C. F. Redmer, S. B. Liu, Stephen Lars Olsen, L. Zhang, Y. Nefedov, M. Albrecht, S. Pacetti, A. Zhemchugov, H. L. Ma, D. M. Li, X. T. Huang, W. D. Li, H. Muramatsu, H. J. Lu, J. G. Lu, M. Pelizaeus, B. T. Tsednee, J. Z. Bai, M. G. Zhao, Y. H. Yang, Ke Li, Cui Li, X. N. Ma, R. P. Guo, J. Zhu, Y. T. Liang, F. E. Maas, T. Hu, B. Wang, J. J. Xu, Z. Q. Yang, M. Y. Dong, O. Bakina, M. Kavatsyuk, H. B. Liu, F. Li, F. C. Ma, S. Ahmed, Y. X. Yang, Kang Li, J. H. Zou, Z. X. Meng, X. A. Xiong, A. A. Zafar, S. S. Sun, X. B. Ji, M. Tiemens, S. Qian, Q. An, Jialun Ping, K. Zhang, P. X. Shen, Z. Wu, B. X. Zhang, X. Liu, H. R. Qi, P. Patteri, X. Y. Zhang, J. B. Liu, Serkant Ali Cetin, J. S. Huang, Y. H. Zheng, Cong-Feng Qiao, X. S. Qin, Y. J. Sun, Yifan Yang, E. Boger, Q. Zhao, Y. Z. Sun, Y. P. Lu, Zhiqing Zhang, C. X. Liu, K. H. Rashid, Xiang Zhou, I. K. Keshk, I. Tapan, T. Khan, Y. H. Yan, J. F. Qiu, N. Yu. Muchnoi, L. Fava, Bingxuan Liu, X. S. Kang, R. E. Mitchell, S. Jin, P. Kiese, J. W. Zhao, C. X. Lin, Gang Zhao, H. Liang, Y. H. Zhang, W. S. Cheng, Yao Zhang, X. K. Zhou, Fang Liu, S. J. Chen, Y. Ban, P. Weidenkaff, F. H. Heinsius, L. Koch, A. Khoukaz, I. B. Nikolaev, Y. C. Zhu, S. P. Wen, F. Feldbauer, X. H. Mo, I. Denysenko, L. S. Wang, G. Li, Z. L. Huang, Z. G. Wang, H. Y. Zhang, Feng Liu, Haiwen Liu, A. Gilman, R. Baldini Ferroli, K. J. Li, W. C. Yan, V. Prasad, M. H. Ye, M. Ablikim, S. Han, X. R. Zhou, C. D. Fu, C. Q. Feng, Cheng Li, Yi-Tao Wang, Z. Y. Wang, Yang Zhang, R. A. Briere, K. Goetzen, G. F. Chen, W. Kuehn, B. Y. Zhang, X. R. Chen, J. Y. Zhang, Z. Y. Deng, X. S. Jiang, J. Y. Liu, T. Held, M. Fritsch, I. Uman, Q. Liu, L. H. Wu, X. K. Chu, M. Savrie, Y. K. Heng, K. Peters, L. L. Wang, H. Cai, X. N. Li, Xingguo Li, Haiping Peng, Yi Jin, J. W. Li, L. Xia, Ke Wang, Q. Gao, Y. N. Gao, Y. J. Xiao, J. F. Hu, Jianhao Zhang, L. L. Ma, S. J. Zhao, L. Gong, Zhiyong Zhang, Ke Liu, A. Amoroso, P. Larin, P. L. Wang, Muhammad Irshad, Q. A. Malik, G. Mezzadri, R. Poling, Q. J. Xu, R. Kliemt, J. L. Zhang, O. Cakir, J. C. Chen, Xuanhong Lou, X. Y. Niu, P. F. Duan, M. H. Gu, R. Kiuchi, Fenfen An, S. Leiber, A. Mangoni, A. Guskov, S. Nakhoul, A. Dbeyssi, B. L. Wang, Y. F. Wang, X. Q. He, Nasser Kalantar-Nayestanaki, T. Y. Qi, L. M. Gu, M. N. Achasov, L. P. Zhou, T. C. Zhao, Jie Yu, H. Y. Sheng, Y. M. Ma, C. Morales Morales, Z. P. Mao, C. X. Yu, Y. X. Xia, S. H. Zhu, H. Leithoff, Tao Luo, M. Kornicer, Angelo Rivetti, K. J. Zhu, T. Hussain, B. X. Yu, J. Fang, Tao Li, L. D. Liu, L. Y. Dong, B. Zheng, Z. Gao, R. G. Ping, A. Julin, X. Y. Ma, W. X. Gong, G. Cibinetto, Ch. Rosner, H. S. Chen, W. J. Zheng, F. Nerling, G. Y. Tang, F. De Mori, Jie Zhao, D. X. Lin, J. H. Yin, M. Shao, Y. T. Gu, H. L. Dai, Igor Boyko, J. Libby, Meng Wang, X. H. Sun, X. Y. Zhou, Yaquan Fang, H. M. Hu, E. Fioravanti, G. F. Xu, J. Q. Zhang, S. L. Niu, A. Pitka, F. Y. Li, X. Q. Li, Y. F. Long, X. F. Wang, M. Greco, M. Alekseev, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, Q. M. Ma, Q. Y. Li, B. S. Zou, Niklaus Berger, A. Mustafa, K. Y. Liu, Y. Yuan, Y. S. Zhu, Yu Zhang, S. Q. Qu, Z. B. Li, X. Y. Song, Tord Johansson, J. C. Li, J. Zhuang, M. X. Luo, D. V. Dedovich, Xu Zhou, A. Calcaterra, Z. G. Zhao, S. Fegan, L. Z. Liao, H. H. Zhang, Z. J. Sun, Zhiqing Liu, S. Maldaner, H. B. Li, A. G. Denig, J. F. Chang, C. L. Luo, X. Xia, Q. Zhou, C. C. Zhang, B. Zhong, L. B. Guo, A. N. Zhu, Ulrich Wiedner, Tao Zhang, R. X. Yang, T. Ma, Xu Shan, O. B. Kolcu, X. Cai, L. Lavezzi, X. Q. Hao, M. Richter, Z. Ning, Yunlong Zhang, G. R. Liao, Huanhuan Liu, H. L. Liu, D. Bettoni, G. Felici, M. Kuemmel, Matthew Glenn Kurth, W. Shan, Jianping Zheng, S. Zhu, T. J. Min, Dan Wang, M. Destefanis, J. F. Sun, S. F. Zhang, X. L. Gao, S. Marcello, Y. Zeng, F. A. Harris, Zhe Sun, S. Lusso, C. Dong, S. Sosio, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, J. J. Song, L. Sun, Joachim Pettersson, X. Tang, M. Rolo, H. J. Li, F. Cossio, Q. L. Xiu, Zongyuan Wang, Q. Ouyang, S. S. Fang, Y. B. Liu, X. L. Luo, K. Begzsuren, F. Bianchi, C. Sowa, Y. B. Zhao, J. Dong, S. Nisar, C. J. Tang, Y. Hu, Z. A. Liu, D. Xiao, Y. H. Xie, J. Pellegrino, M. Maggiora, Ling Zhao, W. M. Song, Lei Zhao, Z. L. Hou, Jun-Yi Zhang, C. Z. Yuan, Y. P. Guo, Z. P. Zhang, Guangshun Huang, L. Yan, M. Kuessner, P. L. Chen, D. W. Bennett, Zujian Wang, Y. Bai, M. Qi, H. J. Yang, X. Y. Jiang, Y. Zhang, Y. Pan, J. Min, B. Kopf, J. Chai, G. X. Sun, J. V. Bennett, K. L. He, M. Z. Wang, Jimin Zhao, Z. Jiao, Fu-Hu Liu, D. H. Zhang, P. L. Li, M. Bertani, Z. Haddadi, L. Yang, X. L. Ji, G. A. Chelkov, Y. T. Tan, W. Gradl, M. Ripka, A. Q. Guo, Z. Y. Peng, C. W. Wang, G. Rong, D. Y. Wang, A. Yuncu, Y. G. Xie, S. X. Du, Z. L. Dou, W. P. Wang, Z. H. Qin, Xiao-Rui Lyu, Y. Ding, W. G. Li, Y. K. Sun, B. J. Liu, Xiaoyu Zhou, Q. P. Ji, S. Spataro, Y. G. Gao, X. P. Xu, Lei Li, Walter Ikegami Andersson, Z. Y. You, Z. A. Zhu, G. F. Cao, X D Shi, Y. J. Mao, H. X. Yang, T. Weber, I. Garzia, B. Garillon, Huihui Liu, C. P. Shen, L. J. Wu, J. G. Messchendorp, J. P. Dai, Y. J. Mo, Liqing Xu, X. Y. Shen, Magnus Wolke, Y. F. Liang, D. P. Jin, Dayong Wang, N. Qin, Michael Papenbrock, F. Yan, Z. J. Xiao, Minglin Ma, Xiaozhong Huang, Andrzej Kupsc, and M. L. Chen
Subjects: Nuclear physics, Physics, 010308 nuclear & particles physics, visual_art, Electron–positron annihilation, 0103 physical sciences, visual_art.visual_art_medium, Bark, Open charm, Born approximation, 010306 general physics, 01 natural sciences
Abstract: The process e(+)e(-) -> pK(S)(0)(n) over barK(-) + c.c. and its intermediate processes are studied for the first time, using data samples collected with the BESIII detector at BEPCII at center-o ...
Published: 2018

212. Observation of the Semileptonic Decay D0→a0(980)−e+νe and Evidence for D+→a0(980)0e+νe

Author: Q. Liu, X. L. Ji, Y. H. Yan, L. L. Ma, A. Calcaterra, Z. G. Zhao, L. Z. Liao, J. W. Zhao, W. G. Li, S. J. Zhao, Magnus Wolke, F. De Mori, Y. C. Zhu, L. Gong, L. G. Xia, A. Amoroso, A. Dbeyssi, Y. G. Xie, X. F. Wang, Angelo Rivetti, I. K. Keshk, H. H. Zhang, Q. M. Ma, A. Mustafa, X. Y. Niu, Y. Yuan, H. Liang, Y. S. Zhu, Yu Zhang, Y. K. Sun, Xiaoyu Zhou, T. Y. Qi, Y. F. Liang, D. P. Jin, F. Li, F. C. Ma, Z. J. Sun, Q. P. Ji, S. Spataro, X. P. Xu, E. Boger, Bingxuan Liu, W. S. Cheng, Yao Zhang, G. Li, S. X. Du, M. Fritsch, J. Min, S. Maldaner, T. Held, Dayong Wang, N. Qin, Q. J. Xu, M. Y. Dong, Y. F. Wang, L. Koch, A. Khoukaz, Y. X. Xia, S. H. Zhu, X. K. Chu, H. B. Li, J. F. Sun, H. B. Liu, Lei Li, H. M. Liu, R. Baldini Ferroli, A. Gilman, C. D. Fu, X. Liu, J. C. Chen, Xuanhong Lou, Z. L. Dou, J. H. Zou, A. G. Denig, C. L. Luo, Xiaozhong Huang, Nasser Kalantar-Nayestanaki, Y. H. Xie, J. Pellegrino, X. K. Zhou, J. F. Qiu, Q. Zhou, J. Y. Liu, C. Q. Feng, T. Hussain, S. Leiber, P. L. Wang, S. Marcello, Y. Zeng, Ke Liu, X. R. Chen, Z. Y. Deng, C. C. Zhang, L. Fava, S. S. Sun, C. Morales Morales, Yue Pan, S. L. Olsen, X. Y. Ma, Serkant Ali Cetin, M. Maggiora, G. F. Cao, Ling Zhao, Y. H. Zheng, B. Zhong, L. B. Guo, W. X. Gong, Andrzej Kupsc, B. Kopf, Zhe Sun, S. Lusso, Cong-Feng Qiao, Lei Zhao, X. N. Li, L. J. Wu, J. Libby, K. L. He, Xingguo Li, X. S. Qin, M. Albrecht, H. Muramatsu, A. N. Zhu, Ulrich Wiedner, Xiao-Rui Lyu, Z. L. Hou, Q. Gao, Zhiqing Liu, Y. N. Gao, Haiping Peng, M. L. Chen, W. D. Li, X D Shi, N. Yu. Muchnoi, Y. Zhang, Tao Zhang, Yaquan Fang, I. Uman, Yang Zhang, Y. J. Mao, Y. B. Chen, S. B. Liu, L. Zhang, X. S. Kang, X. L. Luo, A. Pitka, Y. H. Zhang, Ke Wang, J. F. Hu, S. Qian, Q. An, Jialun Ping, Y. Nefedov, R. E. Mitchell, Xiaofeng Zhu, J. Z. Zhang, B. T. Tsednee, K. Zhang, X. Y. Zhang, M. Z. Wang, Y. J. Mo, H. X. Yang, I. Garzia, S. Nakhoul, Xu Shan, J. J. Song, L. K. Li, L. Sun, X. Tang, T. Johansson, J. F. Chang, J. C. Li, Michael Papenbrock, Bibo Ke, F. Yan, A. Yuncu, Y. G. Gao, J. Zhu, Jimin Zhao, Z. Y. Wang, M. Rolo, X. H. Sun, Fenfen An, P. L. Li, K. Schoenning, Q. Y. Li, B. S. Zou, J. Z. Fan, Niklaus Berger, J. B. Liu, Y. J. Sun, Yifan Yang, K. Begzsuren, Zhiyong Zhang, W. B. Yan, M. N. Achasov, B. L. Wang, M. G. Zhao, Y. H. Yang, R. P. Guo, Y. P. Lu, O. B. Kolcu, P. W. Luo, H. J. Lu, J. G. Lu, Q. A. Malik, B. Garillon, Huihui Liu, Meng Wang, Muhammad Irshad, G. Mezzadri, Z. J. Xiao, P. Larin, T. C. Zhao, C. Z. Yuan, J. Zhuang, Z. Gao, W. Imoehl, J. Q. Zhang, X. Cai, S. L. Niu, M. Kuemmel, Matthew Glenn Kurth, X. B. Ji, M. Tiemens, P. Patteri, M. X. Luo, D. V. Dedovich, Xu Zhou, S. Pacetti, Shan Jin, K. Goetzen, Cui Li, W. Shan, L. Lavezzi, W. P. Wang, R. Farinelli, F. Bianchi, Z. A. Liu, J. B. Jiao, Dean Liu, F. E. Maas, F. Cossio, L. P. Zhou, X. Q. Hao, F. Y. Li, X. Q. Li, J. G. Messchendorp, T. Hu, Y. F. Long, M. Greco, R. Kliemt, Y. M. Ma, Tao Luo, T. Khan, J. P. Dai, Z. G. Wang, Ke Li, H. Y. Zhang, Z. P. Mao, F. A. Harris, A. Mangoni, A. Guskov, K. J. Zhu, W. L. Chang, B. X. Yu, J. Fang, Jie Yu, V. Prasad, H. L. Ma, Fang Liu, G. F. Chen, D. M. Li, I. Denysenko, O. Bakina, H. Leithoff, G. Y. Tang, D. Y. Liu, W. C. Yan, M. Bertani, J. Y. Zhang, A. Q. Guo, Z. Y. Peng, C. W. Wang, Ch. Rosner, Krisztian Peters, F. Feldbauer, L. Yan, M. Kuessner, H. S. Chen, Z. L. Huang, Feng Liu, B. Y. Zhang, Huanhuan Liu, M. Pelizaeus, Y. Ban, P. Weidenkaff, F. H. Heinsius, G. Felici, S. Ahmed, Y. X. Yang, S. F. Zhang, Jie Zhao, D. X. Lin, S. L. Yang, G. Cibinetto, K. Y. Liu, Liqing Xu, H. L. Dai, Igor Boyko, X. Y. Shen, S. Q. Qu, Z. B. Li, J. J. Xu, M. Ablikim, W. Ikegami Andersson, G. R. Liao, P. X. Shen, Z. Wu, L. Yang, Kang Li, Z. Q. Yang, C. F. Redmer, Alexey Zhemchugov, H. M. Hu, M. Richter, Z. Ning, B. Q. Wang, Yunlong Zhang, L. M. Gu, Y. Ding, Y. K. Heng, X. T. Huang, G. A. Chelkov, J. S. Huang, H. L. Liu, P. Kiese, S. P. Wen, H. J. Li, Z. H. Qin, B. J. Liu, R. A. Briere, D. Bettoni, Q. L. Xiu, G. Rong, Q. Zhao, Y. Z. Sun, J. W. Zhang, C. X. Liu, Z. X. Meng, X. A. Xiong, X. N. Ma, P. R. Li, Zhiqing Zhang, G. S. Huang, X. S. Jiang, Xiang Zhou, M. Alekseev, A. A. Zafar, Zongyuan Wang, R. Poling, X. R. Zhou, C. X. Lin, M. Rump, Gang Zhao, H. L. Jiang, Q. Ouyang, R. X. Yang, H. H. Wang, K. H. Rashid, S. S. Fang, M. Kavatsyuk, Jianping Zheng, Y. B. Liu, G. F. Xu, Y. T. Liang, Y. T. Tan, Cheng Li, S. J. Chen, B. X. Zhang, K. J. Li, W. Gradl, M. Ripka, S. Han, D. Y. Wang, M. Qi, X. Y. Song, H. J. Yang, T. J. Min, L. H. Wu, M. Savrie, Yi Jin, J. W. Li, Y. J. Xiao, M. Destefanis, X. L. Gao, C. Dong, S. Sosio, W. Kühn, Z. Y. You, Z. A. Zhu, J. L. Zhang, T. Weber, C. P. Shen, F. F. Sui, Joachim Pettersson, M. H. Gu, R. Kiuchi, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, Jun-Yi Zhang, Y. P. Guo, Z. P. Zhang, D. W. Bennett, Zujian Wang, Y. Bai, X. Y. Jiang, M. M. Ma, Zahra Haddadi, J. Chai, G. X. Sun, J. V. Bennett, Z. Jiao, Fu-Hu Liu, D. H. Zhang, C. Sowa, Y. B. Zhao, J. Dong, S. Nisar, C. J. Tang, Y. Hu, X. H. Mo, L. S. Wang, M. H. Ye, L. L. Wang, H. Cai, I. B. Nikolaev, J. H. Yin, M. Shao, Y. T. Gu, A. Sarantsev, D. H. Wei, J. S. Lange, L. D. Liu, L. Y. Dong, and F. Nerling
Subjects: Nuclear physics, Physics, Semileptonic decay, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Detector, General Physics and Astronomy, 010306 general physics, 01 natural sciences, Energy (signal processing)
Abstract: Using an e(+)e(-) collision data sample of 2.93 fb(-1) collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of D-0 -> a(0)(980)(-)e(+)nu( ...
Published: 2018

213. Search for invisible decays of ω and ϕ with J/ψ data at BESIII

Author: H. Liang, Q. Liu, Tristan Weber, M. Y. Dong, L. L. Ma, L. Gong, Q. P. Ji, L. G. Xia, Huanhuan Liu, G. Felici, J. H. Zou, A. Amoroso, M. Qi, H. J. Yang, S. S. Sun, M. Richter, A. Dbeyssi, D. Y. Liu, R. Farinelli, L. Y. Dong, L. H. Wu, Ke Liu, Z. Ning, M. Kornicer, Angelo Rivetti, X. L. Ji, J. B. Jiao, S. J. Zhao, B. J. Liu, R. E. Mitchell, M. Savrie, Yi Jin, A. Julin, Xiao-Rui Lyu, Z. Y. Zhang, Y. G. Xie, Y. F. Wang, H. L. Ma, M. H. Gu, M. Kuessner, R. Kiuchi, H. J. Li, W. J. Zheng, Q. J. Xu, J. C. Chen, Xuanhong Lou, L. J. Wu, Q. L. Xiu, Q. A. Malik, G. Mezzadri, W. C. Yan, Z. L. Dou, H. Y. Sheng, J. W. Li, D. M. Li, T. Hussain, H. Muramatsu, Y. J. Xiao, Y. H. Zheng, C. X. Yu, S. Leiber, X. Y. Ma, W. X. Gong, Cong-Feng Qiao, X. K. Zhou, X. Q. He, Y. J. Mo, N. Yu. Muchnoi, X. S. Kang, Nasser Kalantar-Nayestanaki, C. Morales Morales, F. De Mori, B. Zheng, R. G. Ping, L. M. Gu, M. Pelizaeus, M. N. Achasov, L. P. Zhou, G. A. Chelkov, Yue Pan, Y. H. Zhang, Y. M. Ma, S. L. Olsen, A. Pitka, C. H. Li, X. H. Sun, I. B. Nikolaev, J. H. Yin, M. Bertani, Zhiqing Liu, Z. A. Liu, Bibo Ke, X. Y. Zhou, Zongyuan Wang, V. Prasad, Z. P. Mao, H. J. Lu, M. Shao, Y. T. Gu, W. B. Yan, S. Ahmed, Y. X. Yang, X. P. Xu, X. B. Ji, M. Tiemens, Kang Li, L. Yang, J. Fang, Tao Li, S. B. Liu, Y. Nefedov, Z. Y. Wang, J. G. Lu, F. Li, T. Johansson, Y. Ban, P. Weidenkaff, J. F. Chang, S. Qian, Q. An, Jialun Ping, Q. Ouyang, K. Zhang, P. Patteri, X. N. Ma, X. F. Wang, I. R. Boyko, E. Fioravanti, Z. Gao, Ch. Rosner, S. L. Niu, Y. H. Xie, S. P. Wen, J. Pellegrino, X. H. Liu, S. S. Fang, X. Q. Li, C. Sowa, X. Tang, Q. M. Ma, Y. F. Long, S. Pacetti, Y. B. Zhao, O. B. Kolcu, Y. B. Liu, X. Y. Zhang, X. S. Qin, X. R. Zhou, J. P. Dai, F. C. Ma, A. Mustafa, X. Cai, P. L. Wang, Liqing Xu, M. G. Zhao, Y. H. Yang, R. P. Guo, J. Libby, J. Zhu, X. Y. Shen, J. B. Liu, A. Sarantsev, Cheng Li, Yaquan Fang, Shou-hua Zhu, Ling Zhao, W. Shan, L. Lavezzi, X. T. Huang, R. Kliemt, X. Y. Niu, Q. Zhao, X. L. Luo, D. H. Wei, P. R. Li, Y. Z. Sun, J. S. Lange, Y. T. Tan, W. Gradl, Lei Zhao, Z. L. Hou, F. E. Maas, Y. Yuan, Y. J. Sun, Yifan Yang, E. Boger, Y. S. Zhu, Y. Ding, Ke Li, K. Begzsuren, Z. G. Wang, H. Y. Zhang, J. Dong, Yu Zhang, Y. P. Lu, S. Q. Qu, Z. B. Li, G. Rong, W. Ikegami Andersson, W. P. Wang, F. Bianchi, A. Mangoni, Z. X. Meng, X. A. Xiong, I. K. Keshk, A. Guskov, Jie Yu, M. Rolo, X. K. Chu, D. Y. Wang, A. A. Zafar, M. Fritsch, G. F. Chen, J. F. Qiu, T. Hu, M. Papenbrock, Fang Liu, J. Min, W. Kühn, K. Schoenning, Q. Y. Li, B. S. Zou, Z. Y. You, Z. A. Zhu, P. Kiese, L. Fava, H. B. Liu, R. A. Briere, G. S. Huang, C. X. Lin, J. Y. Zhang, S. Nisar, X. S. Jiang, S. L. Yang, U. Wiedner, I. Denysenko, X. H. Mo, L. S. Wang, M. Kavatsyuk, B. Kopf, C. J. Tang, Alexander Leon Gilman, C. P. Shen, Gang Zhao, T. J. Min, K. J. Zhu, Y. Hu, K. H. Rashid, R. X. Yang, Y. K. Heng, M. H. Ye, T. Y. Qi, C. Z. Yuan, K. L. He, S. W. Han, F. Cossio, Lingxuan Zhang, O. Bakina, G. R. Liao, B. Y. Zhang, G. Cibinetto, J. Y. Liu, H. R. Qi, Jimin Zhao, P. L. Li, Y. P. Guo, Y. T. Liang, L. L. Wang, H. Cai, Serkant Ali Cetin, S. J. Chen, X. L. Gao, B. X. Zhang, M. Alekseev, W. S. Cheng, Yao Zhang, C. F. Redmer, G. Li, Y. X. Xia, P. X. Shen, Q. Gao, Y. N. Gao, C. Dong, Y. Zhang, S. Sosio, Z. Wu, C. D. Fu, C. Q. Feng, X. R. Chen, T. Khan, Feng Yan, K. J. Li, Z. Y. Deng, M. Ripka, Joachim Pettersson, Xingguo Li, B. Q. Wang, D. Xiao, Yunlong Zhang, H. L. Liu, Zhiqing Zhang, D. Bettoni, J. L. Zhang, Jianping Zheng, S. Zhu, S. X. Du, K. Y. Liu, M. Destefanis, F. Feldbauer, Z. L. Huang, Feng Liu, J. Q. Zhang, Y. G. Gao, Jun-Yi Zhang, Z. P. Zhang, M. Ablikim, G. Y. Tang, X. Y. Jiang, Y. H. Yan, Jie Zhao, D. X. Lin, J. W. Zhao, Alexey Zhemchugov, H. M. Hu, D. W. Bennett, Zujian Wang, Y. C. Zhu, M. Kuemmel, Matthew Glenn Kurth, F. H. Liu, Nicolas Berger, J. W. Zhang, T. Held, X. Q. Hao, S. Nakhoul, Mario Greco, P. Larin, M. M. Ma, Dan Wang, J. F. Sun, Zahra Haddadi, S. Marcello, Y. Zeng, Zhe Sun, S. Lusso, J. Chai, M. Albrecht, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, G. X. Sun, J. V. Bennett, Li Yan, J. J. Song, L. Sun, W. D. Li, B. T. Tsednee, Z. Jiao, D. H. Zhang, Magnus Wolke, Y. F. Liang, D. P. Jin, Dayong Wang, N. Qin, H. B. Li, I. Uman, X D Shi, C. L. Luo, Y. J. Mao, Z. J. Xiao, H. X. Yang, X. Xia, I. Garzia, Q. Zhou, P. L. Chen, Xiaozhong Huang, C. C. Zhang, B. Zhong, L. B. Guo, B. Garillon, Huihui Liu, Andrzej Kupsc, M. L. Chen, Lei Li, J. G. Messchendorp, A. N. Zhu, Tao Zhang, A. Q. Guo, Z. Y. Peng, C. W. Wang, Xu Shan, W. M. Song, J. C. Li, J. Zhuang, M. X. Luo, D. V. Dedovich, Z. H. Qin, Xu Zhou, W. G. Li, A. G. Denig, Y. K. Sun, Xiaoyu Zhou, S. Spataro, K. Goetzen, H. M. Liu, J. F. Hu, G. F. Cao, A. Calcaterra, Z. G. Zhao, S. Fegan, Tao Luo, L. Z. Liao, Yu Bai, H. H. Zhang, Z. J. Sun, B. X. Yu, S. Maldaner, Shulei Zhang, L. D. Liu, F. Y. Li, J. J. Xu, Z. Q. Yang, H. S. Chen, Alperen Yuncu, J. S. Huang, H. L. Dai, C. X. Liu, Ke Wang, G. F. Xu, S. Jin, F. Nerling, R. Poling, P. F. Duan, F. H. Heinsius, Yang Zhang, M. Maggiora, X. Y. Song, Fenfen An, B. L. Wang, T. C. Zhao, Meng Wang, L. Koch, A. Khoukaz, Muhammad Irshad, R. Baldini Ferroli, Krisztian Peters, M. Z. Wang, F. A. Harris, W. L. Chang, X. N. Li, Haiping Peng, and H. Leithoff
Subjects: Physics, Particle physics, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Vector meson, 010306 general physics, 01 natural sciences
Abstract: Using a data sample of (1310.6±7.0)×106 J/ψ events collected with the BESIII detector operating at the BEPCII collider, we perform the first experimental search for invisible decays of a light vector meson (V=ω, ϕ) via J/ψ→Vη decays. The decay of η→π+π−π0 is utilized to tag the V meson decaying into the invisible final state. No evidence for a significant invisible signal is observed, and the upper limits on the ratio of branching fractions at the 90% confidence level are determined to be B(ω→invisible)B(ω→π+π−π0)
Published: 2018

214. Observation of a00(980)−f0(980) Mixing

Author: L. Yang, Jiangbo Zhu, M. Qi, H. J. Yang, S. B. Liu, W. Gradl, M. Ripka, D. Y. Wang, J. Min, B. Kopf, K. L. He, M. Z. Wang, Jimin Zhao, P. L. Li, A. Pitka, Guangshun Huang, L. Yan, Zhiqing Liu, Kai Liu, T. Johansson, G. A. Chelkov, J. F. Chang, Y. H. Xie, J. Pellegrino, O. B. Kolcu, Y. Nefedov, X. Cai, L. Lavezzi, M. Maggiora, Ling Zhao, W. M. Song, Lei Zhao, Z. L. Hou, C. Sowa, Y. B. Zhao, W. Shan, X. Q. Hao, J. Dong, Xiao-Rui Lyu, T. Khan, Y. Q. Wang, M. Richter, Z. Ning, C. Z. Yuan, S. Nisar, C. J. Tang, M. Kuhlmann, Q. Liu, Y. Hu, Y. P. Lu, Michael Papenbrock, Z. A. Liu, G. Felici, C. Leng, X. Fang, D. Xiao, L. L. Ma, L. Gong, Bibo Ke, Z. L. Huang, W. B. Yan, Cui Li, A. Amoroso, Feng Liu, Jun-Yi Zhang, Y. P. Guo, M. Albrecht, H. Liang, M. Ablikim, M. N. Achasov, Z. P. Zhang, Z. J. Xiao, W. D. Li, Y. G. Gao, B. T. Tsednee, S. Pacetti, G. S. Varner, A. Dbeyssi, Zhuoming Li, D. W. Bennett, Zujian Wang, Y. Bai, Ke Wang, H. J. Li, Y. H. Zheng, J. Q. Zhang, Q. L. Xiu, Cong-Feng Qiao, X. Y. Jiang, M. M. Ma, Yunlong Zhang, A. Julin, D. Bettoni, L. J. Wu, H. J. Lu, I. Tapan, Ke Li, J. L. Zhang, F. De Mori, M. Y. Dong, Zahra Haddadi, S. Ahmed, Y. X. Yang, N. Yu. Muchnoi, P. F. Duan, J. G. Lu, R. Poling, Y. Pan, Jianping Zheng, Y. J. Mo, Y. H. Yan, J. Chai, S. Zhu, Yao Wang, J. W. Zhao, X. Y. Zhou, G. X. Sun, J. V. Bennett, X. S. Kang, Y. H. Zhang, Jianhao Zhang, M. Tiemens, F. E. Maas, H. B. Liu, Z. Jiao, Fu-Hu Liu, D. H. Zhang, I. Uman, Gianfranco Morello, Magnus Wolke, T. Hu, S. Gu, Y. C. Zhu, Y. F. Liang, Fenfen An, Q. Ouyang, S. S. Fang, B. L. Wang, X. F. Wang, Ke Liu, Z. G. Wang, O. Bakina, X. L. Ji, H. Y. Zhang, Haiwen Liu, D. P. Jin, J. H. Zou, M. Destefanis, Q. Zhao, T. Weber, X. N. Ma, X. L. Gao, J. F. Sun, Q. M. Ma, Y. B. Liu, Z. Y. Wang, A. Mustafa, Y. Z. Sun, T. C. Zhao, X. Y. Niu, Yaquan Fang, H. Xiao, E. Boger, Dayong Wang, N. Qin, Y. J. Mao, P. X. Shen, S. S. Sun, P. Larin, Z. Wu, T. Held, Shun-Jia Huang, H. X. Yang, G. F. Chen, Y. Yuan, Y. S. Zhu, X. S. Qin, Xiang Zhou, P. L. Wang, C. Dong, S. Sosio, X. L. Luo, Yu Zhang, M. Fritsch, R. Kliemt, I. Garzia, Xiaozhong Huang, Q. P. Ji, M. Kavatsyuk, S. Marcello, Y. Zeng, Zhiqing Zhang, Yanwei Wang, R. E. Mitchell, Gang Zhao, Liqing Xu, X. Y. Shen, Joachim Pettersson, F. Feldbauer, J. Y. Zhang, O. Dorjkhaidav, B. Garillon, Y. G. Xie, X. K. Zhou, Fang Liu, B. X. Zhang, F. Bianchi, C. Hu, Andrzej Kupsc, K. Schoenning, Q. Y. Li, B. S. Zou, Y. Ding, Jie Yu, X. Tang, I. Denysenko, S. X. Du, W. C. Yan, Z. L. Dou, Niklaus Berger, R. Farinelli, M. L. Chen, B. J. Liu, Q. A. Malik, G. Mezzadri, A. Yuncu, M. Rolo, J. G. Messchendorp, B. X. Yu, B. Y. Zhang, J. P. Dai, X. Q. He, H. L. Ma, W. Kühn, Y. B. Chen, J. Z. Zhang, Z. Y. You, Y. X. Xia, S. H. Zhu, D. M. Li, Zhi Zeng, Qiunan Xu, T. J. Min, K. J. Zhu, Z. A. Zhu, L. P. Zhou, Y. M. Ma, Z. P. Mao, J. J. Song, L. Sun, A. Q. Guo, G. Rong, M. Pelizaeus, T. Holtmann, H. S. Chen, C. P. Shen, G. Cibinetto, J. Y. Liu, J. Fang, Tao Li, Z. Gao, G. Y. Tang, Jin Li, H. L. Dai, Igor Boyko, Lei Zhang, X. H. Xie, Q. Gao, Y. N. Gao, Y. Zhang, Q. An, Ch. Rosner, L. Koch, Xuesong Liu, Jie Zhao, D. X. Lin, Alexey Zhemchugov, H. M. Hu, A. Khoukaz, M. Kuemmel, R. Baldini Ferroli, J. Z. Bai, F. A. Harris, W. P. Wang, H. Leithoff, F. Li, M. Alekseev, Z. H. Qin, F. C. Ma, Dan Wang, X. N. Li, Krisztian Peters, M. G. Zhao, Y. H. Yang, R. P. Guo, Haiping Peng, J. F. Qiu, L. Fava, G. R. Liao, B. Q. Wang, W. G. Li, Y. K. Sun, S. Spataro, X. P. Xu, X. B. Ji, P. Patteri, J. M. Bian, S. J. Zhao, Lei Li, Q. J. Xu, Bingxuan Liu, S. Jin, G. Li, G. F. Cao, J. C. Chen, Xuanhong Lou, Nasser Kalantar-Nayestanaki, C. D. Fu, C. Q. Feng, X. R. Chen, Z. Y. Deng, C. Morales Morales, Xingguo Li, K. Goetzen, V. Prasad, S. Han, L. H. Wu, M. Savrie, Yi Jin, L. Xia, Y. J. Xiao, Z. H. Wang, C. F. Redmer, C. Schnier, X. T. Huang, D. Y. Liu, Z. X. Meng, X. A. Xiong, A. A. Zafar, J. B. Jiao, Yuekun Heng, S. Q. Zhang, J. J. Xu, K. H. Rashid, Y. T. Liang, S. J. Chen, K. J. Li, H. R. Qi, J. S. Huang, C. X. Liu, Serkant Ali Cetin, S. Qian, Jialun Ping, K. Zhang, X. Y. Zhang, M. Lara, J. B. Liu, Y. J. Sun, G. F. Xu, Z. T. Sun, Xianglei Zhu, Y. Ban, P. Weidenkaff, F. H. Heinsius, S. P. Wen, X. R. Zhou, Cheng Li, J. H. Wei, X. Y. Song, M. H. Gu, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, H. H. Liu, X. K. Chu, J. C. Li, Peilian Liu, Zhiyong Zhang, J. Zhuang, M. X. Luo, D. V. Dedovich, H. B. Li, A. G. Denig, C. L. Luo, C. C. Zhang, B. Zhong, L. B. Guo, H. Muramatsu, Ulrich Wiedner, M. Kornicer, T. Ma, A. Calcaterra, Z. G. Zhao, S. Fegan, H. H. Zhang, Z. J. Sun, I. B. Nikolaev, J. H. Yin, M. Shao, Y. T. Gu, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, X. H. Mo, L. S. Wang, M. H. Ye, L. L. Wang, H. Cai, L. D. Liu, L. Y. Dong, W. J. Zheng, F. Nerling, S. L. Niu, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, K. Y. Liu, W. Ikegami Andersson, Y. F. Wang, T. Hussain, X. Y. Ma, W. X. Gong, X. H. Sun, P. Kiese, S. L. Olsen, R. A. Briere, X. S. Jiang, O. Cakir, and M. Bertani
Subjects: Physics, Meson, 010308 nuclear & particles physics, Branching fraction, 0103 physical sciences, Analytical chemistry, Pi, General Physics and Astronomy, 010306 general physics, 01 natural sciences
Abstract: We report the first observation of a(0)(0)(980)-f(0)(980) mixing in the decays of J/psi -> phi f(0)(980) -> phi a(0)(0)(980) -> phi eta pi(0) and chi(c1) -> a(0)(0)(980)pi(0) -> f(0)(980)pi(0)->pi(+)pi(-)pi(0), using data samples of 1.31 x 10(9) J/psi events and 4.48 x 10(8) psi (3686) events accumulated with the BESIII detector. The signals of f(0)(980) -> a(0)(0)(980) and a(0)(0)(980) -> f(0)(980) mixing are observed at levels of statistical significance of 7.4 sigma and 5.5 sigma, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, g(a0K+K-) and g(f0K+K-), are estimated. The results improve the understanding of the nature of a(0)(0)(980) and f(0)(980).
Published: 2018

215. Precision Study of η′→γπ+π− Decay Dynamics

Author: X. L. Luo, W. P. Wang, T. Holtmann, G. Felici, L. J. Wu, H. J. Li, Q. L. Xiu, M. Y. Dong, Q. Ouyang, S. L. Niu, S. S. Fang, F. Bianchi, Y. B. Liu, F. Y. Li, Jin Li, X. L. Gao, X. N. Ma, Y. H. Guan, J. Y. Liu, R. Kliemt, M. Tiemens, H. B. Liu, C. Leng, J. F. Sun, Xiao-Rui Lyu, M. H. Gu, X. Q. Li, Y. F. Long, M. Greco, Kai Liu, Y. J. Mo, H. Y. Sheng, M. Maggiora, J. P. Dai, Ling Zhao, J. H. Liu, A. Dbeyssi, Ke Wang, C. Dong, M. H. Ye, S. Marcello, Y. Zeng, F. De Mori, X. Y. Jiang, S. Sosio, Yaquan Fang, Z. G. Zhao, S. Fegan, A. Zallo, J. H. Zou, C. X. Yu, Y. Nefedov, M. M. Ma, J. C. Chen, Lei Zhao, Jie Yu, G. S. Varner, Q. Gao, Y. N. Gao, Joachim Pettersson, Z. L. Hou, X. Cai, Y. Zhang, H. H. Zhang, Y. Ban, X. Y. Zhou, L. Yang, M. Fritsch, B. Zheng, Zahra Haddadi, R. G. Ping, M. G. Zhao, R. P. Guo, H. S. Chen, K. Y. Liu, C. Hu, T. Weber, P. F. Duan, J. Q. Zhang, L. D. Liu, J. Z. Zhang, X. Tang, Z. T. Sun, S. S. Sun, Z. J. Sun, R. Poling, Y. N. Zhang, Guo-Ming Chen, J. Z. Fan, A. Yuncu, M. Kavatsyuk, H. Loehner, X. L. Ji, Z. A. Liu, Cui Li, Y. Pan, L. Y. Dong, Orhan Cakir, B. L. Wang, J. Chai, M. N. Achasov, Q. P. Ji, T. J. Min, K. J. Zhu, K. Schoenning, Q. Y. Li, B. S. Zou, P. Kiese, G. X. Sun, C. Z. Yuan, Z. G. Wang, Niklaus Berger, S. L. Olsen, T. C. Zhao, H. J. Lu, J. G. Lu, V. Prasad, Xianglei Zhu, P. Weidenkaff, F. H. Heinsius, F. Li, X. S. Jiang, F. C. Ma, S. Ahmed, Z. Jiao, Fu-Hu Liu, D. H. Zhang, Liqing Xu, X. Y. Shen, H. Liang, F. E. Maas, T. Hu, R. E. Mitchell, B. X. Zhang, O. Fedorov, W. J. Zheng, Yanwei Wang, Y. X. Yang, Y. G. Xie, X. F. Wang, S. P. Wen, X. S. Qin, W. Gradl, M. Ripka, S. X. Du, X. R. Zhou, Y. Ding, K. Li, Z. L. Dou, Cheng Li, X. K. Zhou, Fang Liu, Krisztian Peters, D. Y. Wang, Guangshun Huang, B. J. Liu, L. Yan, J. C. Li, I. Denysenko, Jun-Yi Zhang, Q. M. Ma, D. Bettoni, Y. P. Guo, S. Schumann, J. Min, I. B. Nikolaev, J. Zhuang, R. Baldini Ferroli, B. Kloss, B. Y. Zhang, J. F. Qiu, W. Kühn, Z. P. Zhang, A. Hafner, Q. Zhao, Dmitri Dedovich, Y. Z. Sun, J. H. Yin, Yao Wang, X. B. Ji, Yunlong Zhang, Q. A. Malik, G. Mezzadri, A. Denig, W. C. Yan, X. Y. Niu, M. X. Luo, Yucheng Huang, M. Shao, Y. T. Gu, Y. F. Wang, L. Fava, B. Kopf, M. Albrecht, Z. Y. You, P. Patteri, Z. A. Zhu, Y. Yuan, Y. S. Zhu, M. Bertani, Yu Zhang, Peilian Liu, F. Nerling, G. R. Liao, J. V. Bennett, P. X. Shen, K. L. He, Xiang Zhou, Zhuoming Li, D. W. Bennett, Zujian Wang, L. P. Zhou, E. Fioravanti, Bibo Ke, J. L. Zhang, J. F. Hu, Zhiyong Zhang, D. J. Ambrose, Z. Wu, W. B. Yan, Y. M. Ma, M. Z. Wang, T. Hussain, X. Y. Ma, X. L. Kang, L. W. Jiang, Z. P. Mao, A. Sarantsev, D. H. Wei, P. R. Li, S. Pacetti, Jimin Zhao, Y. X. Xia, S. H. Zhu, Q. Liu, J. S. Lange, Q. W. Zhao, W. X. Gong, Gueorgui Chelkov, Bingxuan Liu, Jianping Zheng, M. L. Chen, H. P. Cheng, Gang Zhao, X. N. Li, G. Li, X. Fang, S. Zhu, J. Fang, Tao Li, Z. Gao, X. D. Ruan, W. G. Li, M. Qi, Zhiqing Zhang, H. J. Yang, M. Ablikim, Haiping Peng, Z. L. Huang, Feng Liu, L. L. Ma, L. Gong, Y. B. Zhao, Lei Zhang, H. B. Li, C. L. Luo, Ch. Rosner, C. D. Fu, W. Shan, X. H. Sun, J. Dong, P. L. Wang, W. D. Li, Tao Luo, X. H. Mo, L. S. Wang, L. G. Xia, S. Spataro, X. P. Xu, C. Q. Feng, X. R. Chen, Y. Y. Liu, Y. Q. Wang, S. Nisar, C. C. Zhang, B. X. Yu, B. Zhong, L. B. Guo, L. L. Wang, R. Farinelli, Lei Li, C. J. Tang, J. J. Zhang, M. Destefanis, Y. Hu, F. A. Harris, Chi Zhang, H. M. Liu, S. B. Liu, Y. P. Lu, Zhi Zeng, H. Cai, L. Zotti, H. Muramatsu, I. Tapan, Y. H. Yan, H. L. Ma, Ulrich Wiedner, D. M. Li, B. Wang, J. W. Zhao, M. Kornicer, Y. C. Zhu, H. Leithoff, T. Ma, G. Cibinetto, D. Xiao, Y. J. Mao, H. R. Qi, R. A. Briere, H. X. Yang, A. Julin, Z. Y. Deng, Xingguo Li, Z. Ning, H. Xiao, E. Boger, M. Pelizaeus, Igor Boyko, I. Garzia, H. L. Dai, T. Held, Huihui Liu, Serkant Ali Cetin, J. P. Liu, Zhiqing Liu, J. G. Messchendorp, Jie Zhao, D. X. Lin, T. Johansson, Qiunan Xu, M. Shi, S. Qian, O. B. Kolcu, A. Calcaterra, Jialun Ping, A. Amoroso, K. Zhang, A. Q. Guo, X. Y. Zhang, W. M. Song, X. Q. Hao, M. Lara, J. B. Liu, Alexey Zhemchugov, H. M. Hu, Y. J. Sun, Xuesong Liu, Z. H. Qin, D. Y. Liu, J. B. Jiao, S. Q. Zhang, Q An, J. W. Zhang, H. Y. Zhang, I. Uman, P. Larin, S. Z. Chen, J. J. Xu, Y. B. Li, J. S. Huang, C. X. Liu, E. H. Thorndike, L. Q. Qin, J. Z. Bai, F. Feldbauer, X. C. Chen, G. F. Xu, S. Jin, Y. H. Zheng, Cong-Feng Qiao, O. Albayrak, N. Yu. Muchnoi, G. F. Cao, X. S. Kang, Y. H. Zhang, Y. Guo, Z. Y. Wang, Yi Chen, X. K. Chu, X. Y. Song, K. Goetzen, J. Y. Zhang, C. P. Shen, Y. K. Heng, J. M. Bian, S. J. Zhao, Q. J. Xu, Xuanhong Lou, Nasser Kalantar-Nayestanaki, C. Morales Morales, Z. J. Xiao, Z. H. Wang, F. F. An, P. Musiol, C. F. Redmer, Xiaocong Ai, Xiaozhong Huang, C. Schnier, X. T. Huang, G. Rong, Andrzej Kupsc, W. L. Yuan, A. A. Zafar, K. H. Rashid, J. F. Chang, Magnus Wolke, Y. T. Liang, Y. F. Liang, S. J. Chen, D. P. Jin, S. Han, Dayong Wang, N. Qin, L. H. Wu, M. Savrie, and L. Xia
Subjects: Physics, Rho meson, 010308 nuclear & particles physics, Electron–positron annihilation, Background data, Form factor (quantum field theory), General Physics and Astronomy, Resonance, 01 natural sciences, Amplitude, Orders of magnitude (time), 0103 physical sciences, Anomaly (physics), Atomic physics, 010306 general physics
Abstract: Using a low background data sample of 9.7×10^{5} J/ψ→γη^{'}, η^{'}→γπ^{+}π^{-} events, which are 2 orders of magnitude larger than those from the previous experiments, recorded with the BESIII detector at BEPCII, the decay dynamics of η^{'}→γπ^{+}π^{-} are studied with both model-dependent and model-independent approaches. The contributions of ω and the ρ(770)-ω interference are observed for the first time in the decays η^{'}→γπ^{+}π^{-} in both approaches. Additionally, a contribution from the box anomaly or the ρ(1450) resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach.
Published: 2018

216. Search for the rare decays D→h(h(′))e+e−

Author: Ling Zhao, F. De Mori, Lei Zhao, Z. L. Hou, X. Y. Zhou, R. Poling, T. Y. Qi, M. H. Ye, Z. Gao, S. L. Niu, X. Q. Li, Y. F. Long, F. Li, Y. X. Xia, X. F. Wang, F. C. Ma, X. K. Zhou, C. Z. Yuan, L. Y. Dong, Q. M. Ma, A. Mustafa, D. Y. Liu, J. B. Jiao, W. J. Zheng, G. Cibinetto, Y. G. Gao, S. B. Liu, G. Y. Tang, H. L. Dai, Y. Nefedov, J. C. Li, K. Y. Liu, X. Y. Niu, J. F. Qiu, M. Papenbrock, Xiaozhong Huang, S. Q. Qu, Z. B. Li, W. Ikegami Andersson, L. Fava, Jie Zhao, D. X. Lin, Alexey Zhemchugov, H. M. Hu, F. H. Liu, Nicolas Berger, J. Zhuang, A. Denig, Y. Yuan, Y. S. Zhu, M. Bertani, Z. G. Wang, H. Y. Zhang, Q An, F. Nerling, J. W. Zhang, Zhiqing Liu, X. R. Chen, X. Q. Hao, M. X. Luo, Yu Zhang, K. Goetzen, X. N. Ma, P. Larin, Orhan Cakir, P. Kiese, A. Dbeyssi, Ke Wang, L. J. Wu, H. J. Lu, J. Y. Liu, W. D. Li, Andrzej Kupsc, Xu Zhou, J. G. Lu, M. Kuessner, Xiao-Rui Lyu, T. Johansson, X. P. Xu, X. B. Ji, Yang Zhang, B. T. Tsednee, G. S. Huang, X. S. Jiang, X. H. Liu, J. Z. Bai, Y. J. Mo, Y. Ban, J. F. Sun, P. F. Duan, F. H. Heinsius, Q. Liu, M. Fritsch, M. L. Chen, P. Patteri, B. L. Wang, Y. F. Wang, M. Kavatsyuk, Q. Gao, J. Y. Zhang, I. Tapan, M. Y. Dong, Y. H. Yan, M. N. Achasov, Y. N. Gao, Y. Zhang, X. T. Huang, O. B. Kolcu, G. Rong, M. Maggiora, Tristan Weber, T. C. Zhao, F. E. Maas, Z. X. Meng, S. Marcello, X. A. Xiong, J. W. Zhao, R. X. Yang, H. B. Li, C. L. Luo, M. Tiemens, Q. Zhou, Y. Zeng, Y. C. Zhu, A. A. Zafar, H. S. Chen, L. Lavezzi, Feng Yan, T. Hu, H. Liang, Tao Luo, Zhe Sun, S. Lusso, X. H. Mo, C. C. Zhang, L. S. Wang, B. Zhong, Q. P. Ji, B. X. Zhang, M. Alekseev, E. Boger, K. H. Rashid, W. S. Cheng, L. L. Ma, L. Gong, P. L. Wang, B. X. Yu, Yao Zhang, G. Li, S. Ahmed, Y. X. Yang, T. Held, Lei Li, Mario Greco, S. Qian, Jialun Ping, A. Amoroso, Meng Wang, Muhammad Irshad, Y. T. Liang, J. H. Zou, K. Zhang, X. Y. Zhang, Kang Li, M. Ablikim, I. Uman, X. Cai, L. G. Xia, K. J. Li, O. Bakina, H. Cai, Sai-Juan Chen, A. N. Zhu, Xiaofeng Zhu, J. Z. Zhang, F. Y. Li, Tao Zhang, L. L. Wang, Y. K. Heng, S. S. Sun, Yangheng Zheng, J. V. Bennett, C. D. Fu, Liqing Xu, J. J. Song, L. Sun, Alperen Yuncu, Jin Li, T. Hussain, C. Q. Feng, T. Ma, G. F. Xu, Igor Boyko, I. B. Nikolaev, Xu Shan, Z. Y. Deng, F. A. Harris, Q. Zhao, Dmitri Dedovich, J. H. Yin, L. H. Wu, Y. J. Sun, Yifan Yang, X. Y. Ma, W. X. Gong, M. Savrie, Z. J. Xiao, Y. Z. Sun, Yi Jin, L. Koch, S. Jin, A. Khoukaz, P. L. Chen, M. Ripka, G. F. Cao, Y. P. Lu, I. K. Keshk, M. Shao, Y. T. Gu, J. W. Li, Y. J. Xiao, H. Leithoff, M. Kornicer, Y. Ding, B. J. Liu, J. P. Dai, R. Baldini Ferroli, Z. G. Zhao, S. Fegan, L. Z. Liao, Lingxuan Zhang, Xingguo Li, C. X. Lin, P. X. Shen, Alexander Leon Gilman, Gang Zhao, E. Fioravanti, F. F. An, Angelo Rivetti, Z. Wu, D. Bettoni, Krisztian Peters, R. A. Briere, A. Julin, M. Z. Wang, Yu Bai, H. H. Zhang, Huanhuan Liu, R. E. Mitchell, T. Khan, Gueorgui Chelkov, M. Kuemmel, Matthew Glenn Kurth, M. G. Zhao, Y. H. Yang, X. N. Li, W. Kühn, Z. Y. You, Z. A. Zhu, C. H. Li, X. H. Sun, Z. J. Sun, X. Y. Song, L. D. Liu, Ke Liu, H. R. Qi, Zhiqing Zhang, F. Feldbauer, R. Kliemt, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, J. F. Chang, G. Felici, R. P. Guo, J. Zhu, Haiping Peng, R. Farinelli, Q. A. Malik, X. L. Ji, S. Maldaner, Bibo Ke, Magnus Wolke, A. Mangoni, Z. L. Huang, Feng Liu, Y. P. Guo, A. Guskov, J. J. Xu, M. Richter, Y. F. Liang, G. Mezzadri, W. C. Yan, Jie Yu, W. B. Yan, H. L. Ma, D. M. Li, Z. Q. Yang, D. P. Jin, Z. Y. Zhang, X. Y. Jiang, X. Q. He, Guo-Ming Chen, Z. A. Liu, Cong-Feng Qiao, Serkant Ali Cetin, Z. Ning, C. P. Shen, H. Muramatsu, K. J. Zhu, N. Yu. Muchnoi, S. Pacetti, Dayong Wang, N. Qin, L. P. Zhou, J. S. Huang, V. Prasad, P. Weidenkaff, M. Pelizaeus, C. X. Liu, X. S. Kang, Y. G. Xie, Y. H. Zhang, Z. P. Mao, S. L. Olsen, S. J. Zhao, A. Pitka, J. Fang, S. P. Wen, Z. L. Dou, X. S. Qin, X. R. Zhou, Z. Y. Wang, Yi Chen, X. K. Chu, Ch. Rosner, Cheng Li, Yao Ma, J. Q. Zhang, J. Libby, Ke Li, Yaquan Fang, Shou-hua Zhu, F. Bianchi, M. H. Gu, R. Kiuchi, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, Dan Wang, K. Schoenning, Q. Y. Li, B. S. Zou, H. J. Li, Fang Liu, Q. J. Xu, U. Wiedner, I. Denysenko, Xuanhong Lou, Q. L. Xiu, Nasser Kalantar-Nayestanaki, M. Albrecht, C. Morales Morales, B. Y. Zhang, Yue Pan, G. R. Liao, Zongyuan Wang, B. Q. Wang, Q. Ouyang, S. S. Fang, Y. B. Liu, X. L. Luo, K. Begzsuren, W. P. Wang, X D Shi, Y. J. Mao, H. X. Yang, I. Garzia, B. Garillon, Huihui Liu, J. G. Messchendorp, Qiunan Xu, A. Calcaterra, A. Q. Guo, Z. Y. Peng, W. M. Song, M. Qi, Z. H. Qin, H. J. Yang, W. G. Li, Y. K. Sun, Xiaoyu Zhou, S. Spataro, H. M. Liu, J. F. Hu, Jun-Yi Zhang, Z. P. Zhang, X. Y. Shen, L. Yang, D. W. Bennett, Zujian Wang, J. B. Liu, Y. T. Tan, W. Gradl, C. Sowa, Y. B. Zhao, W. Shan, D. Y. Wang, J. Dong, J. Min, H. B. Liu, B. Kopf, S. Nisar, K. L. He, C. J. Tang, Y. Hu, S. W. Han, Jimin Zhao, P. L. Li, D. Xiao, C. F. Redmer, M. M. Ma, J. C. Chen, Zahra Haddadi, J. Chai, G. X. Sun, Li Yan, Z. Jiao, D. H. Zhang, X. L. Gao, C. Dong, S. Sosio, Joachim Pettersson, Yunlong Zhang, H. L. Liu, J. L. Zhang, Jianping Zheng, S. Zhu, S. X. Du, M. Destefanis, X. Tang, M. Rolo, F. Cossio, Y. H. Xie, and J. Pellegrino
Subjects: Physics, Particle physics, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Hadron, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences
Abstract: We search for rare decays of D mesons to hadrons accompanied by an electron-positron pair (h(h((')))e(+)e(- )),using an e(+)e(-) collision sample corresponding to an integrated luminosity of 2.93 fb(-1) collected with the BESIII detector at root s = 3.773 GeV. No significant signals are observed, and the corresponding upper limits on the branching fractions at the 90% confidence level are determined. The sensitivities of the results are at the level of 10(-5)-10(-6), providing a large improvement over previous searches.
Published: 2018

217. Measurement of e+e−→KK¯J/ψ cross sections at center-of-mass energies from 4.189 to 4.600 GeV

Author: W. M. Song, Z. H. Qin, Jia-Jia Qin, Xiaozhong Huang, L. J. Wu, X. L. Gao, Xichao Ruan, Andrzej Kupsc, C. Dong, S. Sosio, Yunlong Zhang, D. Bettoni, J. L. Zhang, Jianping Zheng, S. Zhu, M. L. Chen, S. X. Du, K. Y. Liu, Y. J. Mao, H. X. Yang, M. Destefanis, I. Garzia, Joachim Pettersson, M. H. Gu, P. L. Wang, Huihui Liu, I. Uman, J. P. Liu, H. Y. Sheng, J. G. Messchendorp, Y. J. Mo, Z. J. Xiao, Qiunan Xu, P. L. Chen, C. Hu, C. X. Yu, X. Tang, W. G. Li, A. G. Denig, C. Leng, Y. K. Sun, S. Spataro, J. C. Li, Q. Liu, Tristan Weber, K. J. Zhu, Yaquan Fang, Shou-hua Zhu, H. M. Liu, M. Richter, Y. H. Xie, X. L. Luo, B. Zheng, R. G. Ping, Magnus Wolke, G. F. Cao, Y. F. Liang, Z. Ning, J. Pellegrino, J. Zhuang, L. L. Ma, L. Gong, S. Qian, Q. An, Jialun Ping, K. Zhang, D. P. Jin, X. Y. Zhang, X. H. Liu, Bibo Ke, M. X. Luo, Tao Luo, M. Maggiora, Ling Zhao, Z. A. Liu, Dayong Wang, N. Qin, K. Schoenning, Q. Y. Li, B. S. Zou, D. V. Dedovich, J. M. Bian, S. J. Zhao, B. J. Liu, L. G. Xia, A. Amoroso, Q. A. Malik, G. Mezzadri, X. N. Ma, Y. X. Xia, W. P. Wang, F. Bianchi, J. Q. Zhang, A. Dbeyssi, J. P. Dai, W. C. Yan, V. Prasad, X. Q. He, Y. Ban, P. Weidenkaff, W. B. Yan, R. Kliemt, S. P. Wen, J. B. Liu, X. K. Zhou, M. Kornicer, M. N. Achasov, L. P. Zhou, Lei Zhao, Z. L. Hou, Xiao-Rui Lyu, X. S. Qin, X. R. Zhou, Cheng Li, Y. M. Ma, Q. J. Xu, Z. P. Mao, A. Zallo, J. Fang, Tao Li, A. Julin, F. De Mori, B. X. Yu, X. K. Chu, Jie Yu, H. J. Lu, J. G. Lu, Y. J. Sun, Yifan Yang, E. Boger, S. Pacetti, Zhi Zeng, Z. H. Wang, Ch. Rosner, J. C. Chen, Peilian Liu, Xuanhong Lou, X. Y. Zhou, Q. P. Ji, S. Leiber, Nasser Kalantar-Nayestanaki, Lingxuan Zhang, I. R. Boyko, H. Liang, F. E. Maas, A. Calcaterra, Z. G. Zhao, S. Fegan, D. Y. Liu, G. S. Varner, J. Q. Li, T. Hu, C. Z. Yuan, Y. P. Lu, Y. G. Gao, T. J. Min, X. F. Wang, Q. M. Ma, M. Fritsch, Meng Wang, G. Cibinetto, Zhiqing Liu, C. Morales Morales, M. Kuhlmann, Yue Pan, F. Y. Li, Z. G. Wang, Liqing Xu, A. Mustafa, H. H. Zhang, X. Y. Niu, Y. Yuan, Y. S. Zhu, T. Johansson, J. F. Chang, M. Kavatsyuk, Z. J. Sun, Zongyuan Wang, G. Y. Tang, H. Y. Zhang, M. Albrecht, O. Bakina, P. Musiol, Ke Li, J. B. Jiao, Yu Zhang, H. S. Chen, Alperen Yuncu, Jin Li, Ke Liu, S. B. Liu, C. Schnier, Y. Q. Wang, H. L. Dai, Y. F. Wang, G. F. Chen, W. D. Li, O. B. Kolcu, P. X. Shen, Manuel Lara, B. T. Tsednee, Yao Zhang, G. Li, Jie Zhao, Z. Wu, H. B. Li, Fang Liu, D. X. Lin, Q. Ouyang, Y. H. Zheng, C. L. Luo, X. Xia, Alexey Zhemchugov, H. M. Hu, X. L. Ji, Cong-Feng Qiao, X. Cai, F. A. Harris, L. Lavezzi, R. Farinelli, U. Wiedner, I. Denysenko, J. Y. Zhang, L. Koch, C. D. Fu, Zhiqing Zhang, B. X. Zhang, Y. Nefedov, C. C. Zhang, B. Zhong, L. B. Guo, S. S. Fang, Z. Y. Zhang, G. A. Chelkov, C. Q. Feng, F. H. Liu, X. R. Chen, Nicolas Berger, Z. Y. Deng, M. Ripka, Lei Li, N. Yu. Muchnoi, X. S. Kang, X. T. Huang, H. Leithoff, G. Rong, R. Baldini Ferroli, Y. K. Heng, Y. Ding, Y. H. Zhang, Y. G. Xie, X. H. Mo, L. S. Wang, I. Tapan, Y. B. Liu, Y. H. Yan, J. W. Zhang, B. Y. Zhang, Xingguo Li, F. Li, J. W. Zhao, T. Ma, F. C. Ma, S. L. Olsen, Krisztian Peters, X. A. Xiong, A. A. Zafar, L. Zotti, J. Z. Bai, M. H. Ye, Z. L. Dou, M. Z. Wang, Y. C. Zhu, Huanhuan Liu, G. Felici, Z. Y. Wang, X. Q. Hao, M. G. Zhao, Y. H. Yang, R. P. Guo, Yao Wang, H. Xiao, X. N. Li, J. Zhu, W. Kühn, M. Y. Dong, H. L. Ma, M. Tiemens, Haiping Peng, X. P. Xu, X. B. Ji, D. M. Li, T. Held, Mario Greco, K. H. Rashid, Z. Y. You, Z. A. Zhu, Ke Wang, P. Patteri, J. F. Qiu, M. Papenbrock, J. H. Zou, P. Larin, L. Fava, H. J. Li, T. Khan, Q. L. Xiu, S. S. Sun, F. Nerling, Y. T. Liang, H. Muramatsu, S. J. Chen, R. Poling, P. F. Duan, F. H. Heinsius, Gianfranco Morello, Fenfen An, X. Fang, L. L. Wang, H. Cai, C. P. Shen, B. L. Wang, R. E. Mitchell, H. R. Qi, T. C. Zhao, Yang Zhang, F. Feldbauer, Z. L. Huang, Feng Liu, Y. P. Guo, M. Pelizaeus, M. Ablikim, X. Y. Jiang, Serkant Ali Cetin, I. B. Nikolaev, T. Holtmann, L. H. Wu, J. H. Yin, J. Y. Liu, M. Savrie, M. Shao, Y. T. Gu, Y. J. Xiao, Q. Gao, Y. N. Gao, Y. X. Zhou, E. Fioravanti, S. Ahmed, Y. X. Yang, Kang Li, X. L. Kang, M. R. Shepherd, S. Q. Zhang, Q. Zhao, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, M. Bertani, L. Yang, Y. Z. Sun, W. Gradl, Gang Zhao, D. Y. Wang, M. Qi, H. J. Yang, L. Y. Dong, X. Y. Shen, W. J. Zheng, J. Min, H. B. Liu, B. Kopf, K. L. He, S. W. Han, Jimin Zhao, P. L. Li, C. F. Redmer, J. F. Sun, S. Marcello, Y. Zeng, Zhe Sun, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, J. J. Song, L. D. Liu, J. J. Xu, J. S. Huang, C. X. Liu, M. Kuemmel, K. Goetzen, G. F. Xu, S. Jin, X. Y. Song, Dan Wang, S. Gu, P. Kiese, R. A. Briere, G. R. Liao, G. S. Huang, X. S. Jiang, B. Q. Wang, O. Cakir, T. Hussain, X. Y. Ma, W. X. Gong, C. H. Li, X. H. Sun, M. M. Ma, Z. Gao, S. L. Niu, Zahra Haddadi, X. Q. Li, Y. F. Long, J. Chai, G. X. Sun, J. V. Bennett, Li Yan, Z. B. Li, W. Ikegami Andersson, Z. Jiao, D. H. Zhang, C. Sowa, Y. B. Zhao, W. Shan, J. Dong, S. Nisar, C. J. Tang, Y. Hu, D. Xiao, Jun-Yi Zhang, Z. P. Zhang, D. W. Bennett, Zujian Wang, and A. Q. Guo
Subjects: Physics, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, High Energy Physics::Experiment, Center of mass, 010306 general physics, 01 natural sciences
Abstract: We investigate the process e(+)e(-) -> K (K) over barJ/psi at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb(-1) of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions e(+)e(-) -> K(+)K(-)J/psi and K(S)(0)K(S)(0)J/psi are measured as a function of center-of-mass energy. The energy dependence of the cross section for e(+)e(-) -> K(+)K(-)J/psi is shown to differ from that for pi(+)pi(-)J/psi in the region around the Y(4260). In addition, there is evidence for a structure around 4.5 GeV in the e(+)e(-) -> K(+)K(-)J/psi cross section that is not present in pi(+)pi(-)J/psi.
Published: 2018

218. Precision Measurement of the e+e−→Λc+Λ¯c− Cross Section Near Threshold

Author: A. G. Denig, C. L. Luo, Q. Zhou, I. Tapan, Y. H. Yan, Z. T. Sun, C. C. Zhang, B. Zhong, W. G. Li, Y. K. Sun, H. Muramatsu, A. N. Zhu, Ulrich Wiedner, J. W. Zhao, J. Libby, Q. P. Ji, S. Spataro, X. P. Xu, M. Kornicer, M. Y. Dong, Y. C. Zhu, Yaquan Fang, Xianglei Zhu, Y. Ban, T. Ma, F. De Mori, P. Weidenkaff, F. H. Heinsius, A. Pitka, L. J. Wu, Xu Shan, Lei Li, Meng Wang, X. Y. Zhou, S. P. Wen, E. Boger, H. B. Liu, T. Held, I. B. Nikolaev, X. R. Zhou, K. Schoenning, Q. Y. Li, B. S. Zou, Y. J. Mo, G. F. Cao, J. H. Yin, Cheng Li, M. Shao, Y. T. Gu, J. H. Zou, Niklaus Berger, Q. A. Malik, G. Mezzadri, J. Min, X. Q. He, X. F. Wang, L. Koch, A. Khoukaz, X. Y. Jiang, E. Fioravanti, Zhiqing Liu, S. S. Sun, R. Baldini Ferroli, X. K. Chu, Y. H. Zheng, J. C. Li, Cong-Feng Qiao, K. J. Li, L. P. Zhou, Q. M. Ma, A. Mustafa, N. Yu. Muchnoi, A. Q. Guo, Z. Y. Peng, G. Rong, X. S. Kang, Z. X. Meng, X. A. Xiong, Y. H. Zhang, B. Kopf, Y. M. Ma, Xiao-Rui Lyu, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, H. R. Qi, J. Zhuang, Lei Zhang, Z. P. Mao, Z. Y. Wang, T. Johansson, Michael Papenbrock, X. S. Qin, F. Yan, M. X. Luo, J. F. Sun, J. Fang, A. A. Zafar, Bingxuan Liu, J. F. Chang, P. L. Wang, D. V. Dedovich, K. L. He, T. Holtmann, K. Goetzen, Y. Yuan, Y. S. Zhu, Y. G. Gao, Yu Zhang, Y. H. Xie, J. Pellegrino, M. H. Ye, S. Jin, Xuesong Liu, Z. Gao, X. N. Li, Yao Zhang, G. Li, G. S. Varner, Zhiyong Zhang, K. H. Rashid, M. Z. Wang, X. Y. Niu, Serkant Ali Cetin, Jimin Zhao, M. Albrecht, J. Y. Liu, Zahra Haddadi, Haiping Peng, R. E. Mitchell, Q. Liu, L. D. Liu, W. P. Wang, L. Y. Dong, Ch. Rosner, Z. H. Qin, S. Marcello, A. Gilman, M. Maggiora, O. B. Kolcu, X. Cai, Kai Liu, W. D. Li, Ke Wang, Ling Zhao, W. M. Song, Lei Zhao, Liqing Xu, Y. T. Liang, X. Y. Shen, L. L. Ma, L. Gong, F. A. Harris, Y. Zeng, C. D. Fu, C. Q. Feng, A. Calcaterra, Z. G. Zhao, S. Fegan, F. Nerling, X D Shi, Y. Pan, J. H. Wei, Y. J. Mao, L. Lavezzi, T. Khan, M. Bertani, S. J. Chen, X. R. Chen, J. Chai, Z. J. Xiao, L. Yang, Z. L. Hou, B. T. Tsednee, A. Amoroso, Z. Y. Deng, H. Leithoff, H. X. Yang, H. H. Zhang, G. X. Sun, J. V. Bennett, I. Garzia, J. L. Zhang, M. H. Gu, H. Liang, X. Q. Hao, X. K. Zhou, Fang Liu, S. Lusso, P. F. Duan, S. Qian, V. Prasad, Z. J. Sun, Xingguo Li, Jiangbo Zhu, Y. Nefedov, Jialun Ping, Z. Jiao, Fu-Hu Liu, D. H. Zhang, S. Han, Yi-Tao Wang, Y. Ding, Minglin Ma, K. Zhang, A. Dbeyssi, X. H. Mo, L. S. Wang, H. Y. Sheng, Fenfen An, B. L. Wang, X. Y. Zhang, M. Fritsch, J. Z. Bai, S. J. Zhao, Q. Gao, F. Li, F. C. Ma, L. H. Wu, Y. N. Gao, X. L. Ji, Jun-Yi Zhang, B. J. Liu, L. L. Wang, Y. T. Tan, W. Gradl, Q. An, B. Garillon, Huihui Liu, H. Cai, M. Lara, J. B. Liu, X. Tang, T. Y. Qi, M. Ripka, C. X. Yu, T. C. Zhao, I. Denysenko, W. C. Yan, Jianhao Zhang, Y. P. Guo, Ke Liu, M. Savrie, Y. J. Sun, Yifan Yang, J. S. Huang, C. Z. Yuan, M. Kuhlmann, Yi Jin, A. Julin, D. Y. Wang, J. G. Messchendorp, Z. P. Zhang, J. P. Dai, C. X. Liu, W. Kühn, Qiunan Xu, Z. Y. You, Z. A. Zhu, B. Zheng, R. G. Ping, Y. P. Lu, Y. B. Chen, J. Z. Zhang, J. W. Li, J. F. Qiu, Cui Li, S. Ahmed, Y. X. Yang, L. Xia, Y. J. Xiao, Kang Li, M. Qi, Magnus Wolke, H. J. Yang, P. L. Chen, Zhuoming Li, D. W. Bennett, Zujian Wang, X. B. Ji, M. Tiemens, P. Patteri, D. Y. Liu, H. J. Lu, T. Weber, J. G. Lu, B. Y. Zhang, L. Fava, Y. Bai, J. B. Jiao, J. J. Song, Y. F. Liang, D. P. Jin, G. F. Xu, Q. J. Xu, Yuekun Heng, B. X. Yu, Zhi Zeng, F. Feldbauer, Y. G. Xie, Z. L. Huang, Q. Zhao, Y. Z. Sun, Guangshun Huang, L. Yan, R. Kliemt, S. Q. Zhang, C. P. Shen, L. Sun, A. Yuncu, M. Rolo, Xiang Zhou, F. E. Maas, Dayong Wang, N. Qin, C. Sowa, Y. B. Zhao, J. C. Chen, Xuanhong Lou, S. X. Du, C. X. Lin, T. Hu, Yang Zhang, C. F. Redmer, J. F. Hu, Xiaozhong Huang, X. Y. Song, H. S. Chen, Gang Zhao, Y. X. Xia, S. H. Zhu, A. Guskov, Z. L. Dou, J. Dong, Jie Yu, C. Schnier, Feng Liu, M. Ablikim, G. A. Chelkov, Nasser Kalantar-Nayestanaki, X. T. Huang, Y. Zhang, H. L. Dai, Igor Boyko, O. Bakina, S. B. Liu, R. Farinelli, Y. Q. Wang, S. Nisar, Andrzej Kupsc, H. L. Ma, Bibo Ke, C. J. Tang, Y. Hu, Z. A. Liu, M. L. Chen, D. M. Li, C. Morales Morales, P. X. Shen, Z. Wu, D. Xiao, M. Pelizaeus, F. Cossio, K. J. Zhu, W. B. Yan, M. Richter, Zhiqing Zhang, Z. Ning, Krisztian Peters, M. N. Achasov, Z. G. Wang, G. Cibinetto, H. Y. Zhang, S. Pacetti, Haiwen Liu, X. N. Ma, Ke Li, G. R. Liao, B. Q. Wang, G. Y. Tang, Yunlong Zhang, H. L. Liu, D. Bettoni, G. F. Chen, M. Kuemmel, J. Y. Zhang, Jie Zhao, D. X. Lin, W. Shan, Jia Xu, Alexey Zhemchugov, H. M. Hu, R. Poling, Dan Wang, M. Kavatsyuk, Jianping Zheng, S. Zhu, Jin Li, P. L. Li, M. Alekseev, I. Uman, M. G. Zhao, R. P. Guo, M. Destefanis, B. X. Zhang, P. Larin, X. L. Gao, C. Dong, S. Sosio, Yao Wang, Y. Yang, Joachim Pettersson, J. Q. Zhang, S. L. Niu, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, K. Y. Liu, W. Ikegami Andersson, P. Kiese, S. L. Olsen, R. A. Briere, X. S. Jiang, O. Cakir, Y. F. Wang, T. Hussain, X. Y. Ma, W. X. Gong, X. H. Sun, X. L. Luo, K. Begzsuren, F. Bianchi, Huanhuan Liu, G. Felici, H. J. Li, Q. L. Xiu, Zongyuan Wang, Q. Ouyang, S. S. Fang, Y. B. Liu, and H. B. Li
Subjects: Physics, 010308 nuclear & particles physics, Electron–positron annihilation, Analytical chemistry, General Physics and Astronomy, Lambda, 01 natural sciences, Near threshold, Cross section (physics), Angular distribution, 0103 physical sciences, High Energy Physics::Experiment, Born approximation, 010306 general physics, Clearance, Bar (unit)
Abstract: The cross section of the e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (-)(c) process is measured with unprecedented precision using data collected with the BESIII detector at root s = 4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Lambda(+)(c)(Lambda) over bar (-)(c) production threshold is cleared. At center-of-mass energies root s = 4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Lambda(c) polar angle distributions. From these, the.c electric over magnetic form-factor ratios (vertical bar G(E)/G(M)vertical bar) are measured for the first time. They are found to be 1.14 +/- 0.14 +/- 0.07 and 1.23 +/- 0.05 +/- 0.03, respectively, where the first uncertainties are statistical and the second are systematic.
Published: 2018

219. The new cylindrical GEM inner tracker of BESIII

Author: M. Maggiora, M. Mignone, S. Sosio, A. Pelosi, S. Chiozzi, J. Y. Chai, M. Bertani, Cy. Leng, J. Pellegrino, M. Rolo, S. Cerioni, M. Greco, N. Canale, R. Malaguti, Maxim Alexeev, L. Fava, M. Scodeggio, L. Lavezzi, F. Cossio, S. Verma, G. Mezzadri, S. Spataro, E. Soldani, L. Yan, H. B. Li, A. Amoroso, M. Savrié, A. Rivetti, M. Destefanis, S. Marcello, Fabrizio Bianchi, P. Patteri, I. Garzia, E. Fioravanti, Jianmin Dong, E. Tskhadadze, Richard Wheadon, A. Cotta Ramusino, F. De Mori, M. Capodiferro, M. Melchiorri, F. Evangelisti, A. Calcaterra, V. Carassiti, G. Cibinetto, M. Gatta, R. Farinelli, Gianfranco Morello, Giulietto Felici, S. Pacetti, R. Baldini Ferroli, and D. Bettoni
Subjects: Physics, Physics - Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, hep-ex, Physics::Instrumentation and Detectors, FOS: Physical sciences, Tracking system, Magnetic field effect, Instrumentation and Detectors (physics.ins-det), 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Upgrade, Optics, 0103 physical sciences, Gas electron multiplier, Detectors and Experimental Techniques, 010306 general physics, business, physics.ins-det, Particle Physics - Experiment
Abstract: The Cylindrical GEM-Inner Tracker (CGEM-IT) is the upgrade of the internal tracking system of the BESIII experiment. It consists of three layers of cylindrically-shaped triple GEMs, with important innovations with respect to the existing GEM detectors, in order to achieve the best performance with the lowest material budget. It will be the first cylindrical GEM running with analog readout inside a 1T magnetic field. The simultaneous measurement of both the deposited charge and the signal time will permit to use a combination of two algorithms to evaluate the spatial position of the charged tracks inside the CGEM-IT: the charge centroid and the micro time projection chamber modes. They are complementary and can cope with the asymmetry of the electron avalanche when running in magnetic field and with non-orthogonal incident tracks. To evaluate the behavior under different working settings, both planar chambers and the first cylindrical prototype have been tested during various test beams at CERN with 150 GeV/c muons and pions. This paper reports the results obtained with the two reconstruction methods and a comparison between the planar and cylindrical chambers., Proceedings for "Particles and Nuclei International Conference 2017" (PANIC17) Conference, 1-5 September 2017, Beijing, China (prepared for submission to International Journal of Modern Physics: Conference Series)
Published: 2018

220. Performance of the micro-TPC Reconstruction for GEM Detectors at High Rate

Author: L. Yan, S. Spataro, M. Gatta, M. Greco, J. Pellegrino, N. Canale, J. Y. Chai, M. Rolo, Giulietto Felici, F. Evangelisti, A. Pelosi, S. Pacetti, P. Patteri, M. Mignone, Cy. Leng, M. Bertani, A. Amoroso, A. Calcaterra, M. Melchiorri, F. De Mori, S. Sosio, Gianfranco Morello, H. B. Li, R. Farinelli, V. Carassiti, Jianmin Dong, A. Rivetti, R. Baldini Ferroli, S. Cerioni, G. Mezzadri, M. Capodiferro, R. Malaguti, M. Maggiora, E. Tskhadadze, M. Destefanis, S. Marcello, M. Scodeggio, L. Lavezzi, S. Verma, E. Fioravanti, D. Bettoni, F. Cossio, G. Cibinetto, I. Garzia, E. Soldani, M. Savrié, S. Chiozzi, Fabrizio Bianchi, L. Fava, Richard Wheadon, A. Cotta Ramusino, and Maxim Alexeev
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, STRIPS, Tracking (particle physics), gas detector, 01 natural sciences, law.invention, NO, Optics, Planar, law, Nuclear Medicine and Imaging, 0103 physical sciences, high rate, 010306 general physics, Image resolution, Instrumentation, Physics, Time projection chamber, GEM, 010308 nuclear & particles physics, business.industry, Detector, Instrumentation and Detectors (physics.ins-det), μ-TPC, Magnetic field, Radiology, Nuclear Medicine and Imaging, Gas electron multiplier, business, Radiology
Abstract: Gas detectors are one of the pillars of the research in fundamental physics. Since many years, a new concept of detectors, the Micro Pattern Gas Detectors, allows to overcome many of the problems of other types of commonly used detectors, as drift chambers and microstrips, reducing the discharge rate and increasing the radiation tolerance. Among these, one of the most commonly used is the Gas Electron Multiplier. Commonly deployed as fast timing detectors and triggers, due to their fast response, high rate capability and high radiation hardness, they can also be used as trackers. The center of gravity readout technique allows to overcome the limit of the digital pads, whose spatial resolution is constrained by the pitch size. The presence of a high external magnetic field can distort the electronic cloud and affect the spatial resolution. The micro-TPC reconstruction method allows to reconstruct the three dimensional particle position as in a traditional Time Projection Chamber, but within a drift gap of a few millimeters. This method brings these detectors into a new perspective for what concerns the spatial resolution in strong magnetic field. In this report, the basis of this new technique will be shown and it will be compared to the traditional center of gravity. The results of a series of test beam performed with 10 x 10 cm2 planar prototypes in magnetic field will also be presented. This is one of the first implementations of this technique for GEM detectors in magnetic field and allows to reach unprecedented performance for gas detectors, up to a limit of 120 micron at 1T, one of the world's best results for MPGDs in strong magnetic field. The micro-TPC reconstruction has been recently tested at very high rates in a test beam at the MAMI facility; preliminary results of the test will be presented., Proceedings for "2017 IEEE Nuclear Science Symposium and Medical Imaging Conference (NSS/MIC)" (IEEE17) Conference, 21-28 October 2017, Atlanga, Georgia, USA (prepared for submission to IEEE Conference Record)
Published: 2018

221. Study of η(1475) and X(1835) in radiative J/ψ decays to γϕ

Author: J. Min, D. J. Ambrose, H. B. Liu, Xiao-Rui Lyu, Y. B. Zhao, H. Liang, Q. P. Ji, B. Kopf, W. Shan, G. S. Varner, M. Albrecht, K. L. He, J. Dong, Bibo Ke, S. W. Han, W. D. Li, W. B. Yan, G. R. Liao, S. Pacetti, Jimin Zhao, Qiang Zhao, S. Nisar, X. L. Ji, P. L. Li, C. J. Tang, B. Q. Wang, Y. Hu, Ke Liu, Y. P. Lu, C. F. Redmer, Z. Y. Zhang, Y. F. Wang, S. B. Liu, Y. Nefedov, Q. A. Malik, G. Mezzadri, W. C. Yan, X. Q. He, T. Hussain, Fang Liu, X. Y. Ma, W. X. Gong, U. Wiedner, I. Denysenko, D. Xiao, Y. G. Xie, I. Tapan, M. N. Achasov, L. P. Zhou, Y. M. Ma, M. Qi, Magnus Wolke, Y. F. Liang, Z. L. Dou, Y. H. Yan, J. W. Zhao, Z. P. Mao, B. Y. Zhang, D. P. Jin, Y. C. Zhu, H. J. Yang, Y. Ding, T. Khan, C. H. Li, X. H. Sun, C. Leng, J. Fang, Tao Li, Dayong Wang, N. Qin, Z. A. Liu, J. Pellegrino, B. J. Liu, Z. Gao, S. L. Niu, P. L. Wang, X. Q. Li, Y. F. Long, Ch. Rosner, M. M. Ma, Xiaozhong Huang, M. Y. Dong, Y. H. Zheng, Cong-Feng Qiao, W. Kühn, O. Albayrak, Yuanning Gao, T. Held, Mario Greco, Z. G. Wang, X. L. Luo, M. Maggiora, Ling Zhao, X. Fang, L. Zotti, Z. Y. You, Z. A. Zhu, Yaquan Fang, Shou-hua Zhu, N. Yu. Muchnoi, F. Feldbauer, K. Y. Liu, Andrzej Kupsc, Lei Zhao, J. Chai, X. S. Kang, C. D. Fu, G. X. Sun, J. V. Bennett, H. Y. Zhang, Li Yan, J. H. Zou, Z. L. Hou, J. Q. Zhang, Z. B. Li, W. Ikegami Andersson, Yunlong Zhang, Y. H. Zhang, M. L. Chen, Y. J. Mao, H. X. Yang, I. Garzia, S. L. Olsen, P. Kiese, Z. Jiao, D. H. Zhang, S. S. Sun, M. Bertani, Z. Haddadi, Z. L. Huang, Feng Liu, Dan Wang, C. P. Shen, H. J. Lu, J. G. Lu, L. Yang, R. A. Briere, S. Gu, G. S. Huang, K. Schoenning, Q. Y. Li, B. S. Zou, Jun-Yi Zhang, Z. Y. Wang, I. Uman, X. S. Jiang, M. Ablikim, J. Z. Bai, F. E. Maas, J. F. Sun, D. Bettoni, Z. P. Zhang, R. Baldini Ferroli, W. P. Wang, L. J. Wu, Z. J. Xiao, T. Hu, J. L. Zhang, O. Cakir, P. L. Chen, S. Marcello, F. Bianchi, X. Y. Jiang, Z. Ning, Y. J. Mo, D. W. Bennett, Zujian Wang, J. P. Liu, E. H. Thorndike, Krisztian Peters, Y. Zeng, O. Bakina, R. E. Mitchell, Zhe Sun, M. Z. Wang, X. H. Liu, R. Farinelli, Jianping Zheng, X. K. Zhou, S. Zhu, J. G. Messchendorp, G. F. Chen, C. Z. Yuan, J. P. Dai, Qiunan Xu, P. X. Shen, Z. Wu, Y. X. Xia, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, W. Gradl, I. R. Boyko, X. N. Li, A. Q. Guo, Haiping Peng, S. X. Du, J. J. Song, Zhiqing Liu, Liqing Xu, X. Y. Shen, H. L. Ma, D. Y. Liu, D. M. Li, T. Johansson, Zhiqing Zhang, J. F. Chang, D. Y. Wang, J. Y. Zhang, O. B. Kolcu, X. Cai, L. Lavezzi, M. Destefanis, Ke Wang, G. Felici, H. Muramatsu, C. Hu, X. Tang, R. Poling, P. F. Duan, F. H. Heinsius, Gianfranco Morello, Fenfen An, M. Pelizaeus, Yao Wang, G. A. Chelkov, S. Ahmed, Y. X. Yang, Z. H. Qin, B. L. Wang, H. J. Li, Jia-Jia Qin, T. C. Zhao, Q. L. Xiu, K. J. Zhu, S. Q. Zhang, W. G. Li, A. G. Denig, Y. K. Sun, Tao Luo, A. Hafner, X. L. Gao, Y. Z. Sun, X. N. Ma, B. X. Yu, S. Spataro, Q. Ouyang, Zhi Zeng, Y. Y. Liu, C. Dong, S. Sosio, S. S. Fang, Y. K. Heng, Y. B. Liu, F. Y. Li, H. S. Chen, Alperen Yuncu, Jin Li, Gang Zhao, J. M. Bian, S. J. Zhao, X. P. Xu, X. B. Ji, H. M. Liu, M. Tiemens, Joachim Pettersson, H. L. Dai, Manuel Lara, M. Fritsch, T. Holtmann, J. Y. Liu, M. Kavatsyuk, Jie Zhao, D. X. Lin, Alexey Zhemchugov, H. M. Hu, Q. J. Xu, G. F. Cao, O. Dorjkhaidav, J. C. Chen, Xuanhong Lou, Q. Gao, Y. N. Gao, F. H. Liu, Y. Zhang, Nicolas Berger, P. Patteri, Nasser Kalantar-Nayestanaki, Y. X. Zhou, Yuehong Xie, B. X. Zhang, C. Morales Morales, Yue Pan, J. W. Zhang, M. G. Zhao, Y. H. Yang, R. P. Guo, X. Q. Hao, F. Li, F. C. Ma, J. F. Qiu, P. Larin, L. Fava, F. Nerling, M. Alekseev, G. Li, C. Q. Feng, X. R. Chen, Z. Y. Deng, M. Ripka, Xingguo Li, F. A. Harris, R. Kliemt, H. Leithoff, Jie Yu, T. J. Min, G. Cibinetto, S. Qian, Q. An, Jialun Ping, K. Zhang, X. Y. Zhang, J. B. Liu, Y. J. Sun, E. Boger, H. R. Qi, Y. P. Guo, Serkant Ali Cetin, G. F. Xu, J. B. Jiao, S. Jin, H. B. Li, B. Kloss, C. L. Luo, C. C. Zhang, X. Y. Song, B. Zhong, L. B. Guo, Lei Li, K. Goetzen, T. Ma, L. D. Liu, J. J. Xu, J. S. Huang, C. X. Liu, A. Calcaterra, Z. G. Zhao, S. Fegan, F. De Mori, X. Y. Zhou, H. H. Zhang, X. F. Wang, Z. J. Sun, H. Loehner, Q. M. Ma, X. Y. Niu, X. H. Mo, L. S. Wang, Y. Yuan, Y. S. Zhu, Yu Zhang, M. H. Ye, H. H. Liu, Q. Liu, Tristan Weber, L. L. Wang, H. Cai, J. C. Li, L. L. Ma, L. Gong, J. Zhuang, Ts Tsednee, L. G. Xia, A. Amoroso, M. X. Luo, I. B. Nikolaev, J. H. Yin, D. V. Dedovich, M. Shao, Y. T. Gu, A. Dbeyssi, L. H. Wu, M. Kornicer, M. Savrie, A. Julin, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, Y. J. Xiao, J. S. Lange, L. Y. Dong, W. J. Zheng, Z. H. Wang, P. Musiol, C. Schnier, Y. Q. Wang, X. T. Huang, G. Rong, X. A. Xiong, A. A. Zafar, V. Prasad, Y. Ban, P. Weidenkaff, S. P. Wen, X. S. Qin, X. R. Zhou, Cheng Li, K. H. Rashid, Y. T. Liang, S. J. Chen, K. J. Li, Xichao Ruan, M. H. Gu, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, X. K. Chu, Peilian Liu, and Lingxuan Zhang
Subjects: Physics, 010308 nuclear & particles physics, Electron–positron annihilation, Sigma, 01 natural sciences, Gamma gamma, Nuclear physics, Angular distribution, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, Invariant mass, 010306 general physics, Bar (unit)
Abstract: The decay J/psi -> gamma gamma phi is studied using a sample of 1.31 x 10(9) J/psi events collected with the BESIII detector. Two structures around 1475 MeV/c(2) and 1835 MeV/c(2) are observed in the gamma phi invariant mass spectrum for the first time. With a fit on the gamma phi invariant mass, which takes into account the interference between the two structures, and a simple analysis of the angular distribution, the structure around 1475 MeV/c(2) is found to favor an assignment as the eta(1475) and the mass and width for the structure around 1835 MeV/c(2) are consistent with the X(1835). The statistical significances of the two structures are 13.5 sigma and 6.3 sigma, respectively. The results indicate that both eta(1475) and X(1835) contain a sizeable s (s) over bar component.
Published: 2018

222. Observation of e+e−→ϕχc1 and ϕχc2 at s=4.600 GeV

Author: Zhiqing Liu, Z. G. Wang, I. Uman, H. Y. Zhang, Haiwen Liu, J. F. Chang, X. Y. Ma, W. X. Gong, I. Tapan, Y. H. Yan, J. W. Zhao, M. H. Ye, G. F. Chen, P. Larin, J. Y. Zhang, M. Qi, H. J. Yang, O. B. Kolcu, Y. C. Zhu, X. Cai, L. Lavezzi, H. Xiao, L. D. Liu, L. Y. Dong, P. L. Wang, M. H. Gu, X. Y. Niu, Y. J. Mao, H. Leithoff, X. Q. Hao, Q. Liu, X. H. Sun, E. Boger, T. Held, W. J. Zheng, H. Y. Sheng, C. X. Yu, H. X. Yang, I. Garzia, F. Li, F. C. Ma, L. L. Ma, L. Gong, M. Y. Dong, X. L. Luo, H. B. Liu, L. J. Wu, Y. J. Mo, H. J. Lu, J. G. Lu, A. Amoroso, J. M. Bian, S. J. Zhao, F. Bianchi, M. Kuemmel, Y. X. Xia, S. H. Zhu, H. Liang, S. L. Niu, F. Nerling, F. A. Harris, Q. J. Xu, A. Dbeyssi, M. Richter, B. Zheng, R. G. Ping, Huihui Liu, J. P. Liu, J. F. Qiu, L. Fava, J. H. Zou, S. S. Sun, Z. Ning, J. C. Chen, Xuanhong Lou, T. Weber, F. E. Maas, T. Hu, Nasser Kalantar-Nayestanaki, M. Kornicer, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, I. B. Nikolaev, J. H. Yin, K. H. Rashid, C. Morales Morales, X. K. Chu, Y. K. Heng, J. G. Messchendorp, J. P. Dai, L. Koch, Yang Zhang, L. Ya, A. Khoukaz, Jun-Yi Zhang, J. C. Li, M. Shao, Y. T. Gu, A. Julin, X. S. Qin, Huanhuan Liu, Xiao-Rui Lyu, J. Min, G. Y. Tang, Jianhao Zhang, G. Felici, Y. P. Guo, F. De Mori, Q. P. Ji, Jin Li, Karin Schönning, M. Albrecht, Peilian Liu, Qiunan Xu, E. Fioravanti, Ke Liu, R. E. Mitchell, Z. P. Zhang, O. Bakina, Jie Zhao, D. X. Lin, J. Zhuang, Meng Wang, X. Y. Zhou, M. X. Luo, Liqing Xu, W. D. Li, B. T. Tsednee, Zhiyong Zhang, Cui Li, Dan Wang, M. G. Zhao, Y. H. Yang, R. P. Guo, J. Zhu, Krisztian Peters, A. Q. Guo, G. Rong, X. Y. Shen, Y. G. Gao, D. V. Dedovich, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, R. Farinelli, R. Baldini Ferroli, B. Kopf, H. L. Ma, H. J. Li, Alexey Zhemchugov, H. M. Hu, G. S. Varner, Bibo Ke, P. X. Shen, P. L. Chen, K. Y. Liu, X. F. Wang, Yaquan Fang, W. B. Yan, D. W. Bennett, Y. Ding, Q. L. Xiu, M. N. Achasov, Z. T. Sun, K. L. He, D. M. Li, Z. Wu, Zujian Wang, Kai Liu, Z. B. Li, Y. Bai, Q. M. Ma, Tord Johansson, F. Feldbauer, A. Mustafa, Zongyuan Wang, B. J. Liu, S. Pacetti, H. Muramatsu, M. Pelizaeus, Y. Ban, M. Z. Wang, P. Weidenkaff, F. H. Heinsius, Jimin Zhao, G. R. Liao, P. Kiese, H. B. Li, A. G. Denig, Y. Yuan, C. L. Luo, Y. S. Zhu, Yu Zhang, X. H. Mo, L. S. Wang, S. P. Wen, Q. Ouyang, T. Holtmann, P. L. Li, X. R. Zhou, Ke Li, J. Y. Liu, Cheng Li, S. S. Fang, A. Pitka, W. P. Wang, Z. H. Qin, Zhiqing Zhang, S. L. Olsen, R. A. Briere, C. C. Zhang, B. Zhong, Q. Y. Li, B. S. Zou, Z. Y. You, X. K. Zhou, X. S. Jiang, L. L. Wang, H. Cai, Z. A. Zhu, X. Y. Jiang, Y. B. Liu, Fang Liu, I. Denysenko, J. F. Sun, X. L. Ji, Ulrich Wiedner, S. B. Liu, L. Zhang, Y. Nefedov, Niklaus Berger, G. Mezzadri, W. C. Yan, X. N. Li, Q. Gao, Y. N. Gao, W. G. Li, Y. X. Zhou, Y. K. Sun, X. Q. He, S. Spataro, S. Marcello, Y. Zeng, M. Bertani, T. Ma, Z. Haddadi, Talib Hussain, L. Yang, B. Y. Zhang, O. Cakir, C. P. Shen, X. P. Xu, Magnus Wolke, Haiping Peng, Y. F. Liang, C. Leng, S. Ahmed, Y. X. Yang, L. P. Zhou, Kang Li, A. Calcaterra, Z. G. Zhao, S. Fegan, Lei Li, Walter Ikegami Andersson, Y. M. Ma, Y. Pan, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, J. Chai, J. J. Song, Yanwei Wang, H. H. Zhang, L. Sun, Z. P. Mao, G. F. Cao, Q. Zhao, G. X. Sun, J. V. Bennett, D. P. Jin, Y. Z. Sun, Z. J. Sun, J. Fang, Y. G. Xie, Ke Wang, W. Gradl, M. Ripka, D. Y. Wang, Xiang Zhou, Z. Jiao, Fu-Hu Liu, D. H. Zhang, Gang Zhao, Z. Gao, J. Q. Zhang, S. X. Du, C. Sowa, Y. B. Zhao, W. Shan, Ch. Rosner, Z. L. Dou, J. Dong, Y. Q. Wang, S. Nisar, C. J. Tang, Y. Hu, Y. P. Lu, Z. A. Liu, D. Xiao, R. Poling, P. F. Duan, Dayong Wang, N. Qin, Fenfen An, Y. H. Zheng, Cong-Feng Qiao, B. L. Wang, Xiaozhong Huang, T. C. Zhao, N. Yu. Muchnoi, X. S. Kang, Y. H. Zhang, Z. Y. Wang, Andrzej Kupsc, M. L. Chen, B. X. Yu, Zhi Zeng, H. S. Chen, Michael Papenbrock, H. L. Dai, Igor Boyko, Z. J. Xiao, Minglin Ma, Yunlong Zhang, D. Bettoni, J. L. Zhang, Jianping Zheng, S. Zhu, M. Destefanis, R. Kliemt, X. Tang, Jie Yu, A. Yuncu, M. Rolo, T. J. Min, K. J. Zhu, G. Cibinetto, Bingxuan Liu, S. Jin, X. L. Gao, Yao Zhang, G. Li, Q. A. Malik, C. Dong, S. Sosio, C. D. Fu, C. Q. Feng, X. R. Chen, Z. Y. Deng, Xingguo Li, Joachim Pettersson, J. Z. Bai, X. B. Ji, M. Tiemens, P. Patteri, K. Goetzen, W. Kuehn, J. J. Xu, J. S. Huang, C. X. Liu, G. F. Xu, X. Y. Song, Yao Wang, T. Khan, Guangshun Huang, M. Kuessner, Z. L. Huang, Feng Liu, M. Ablikim, G. A. Chelkov, X. N. Ma, Y. T. Liang, Y. H. Xie, B. Wang, J. Pellegrino, M. Fritsch, M. Maggiora, M. Kavatsyuk, Ling Zhao, W. M. Song, Lei Zhao, B. X. Zhang, Z. L. Hou, C. Z. Yuan, M. Kuhlmann, P. Musiol, C. F. Redmer, C. Schnier, X. T. Huang, A. A. Zafar, V. Prasad, S. Han, L. H. Wu, M. Savrie, Yi Jin, L. Xia, Y. J. Xiao, Z. X. Meng, X. A. Xiong, S. Qian, Q. An, Jialun Ping, K. Zhang, S. J. Chen, X. Y. Zhang, K. J. Li, M. Lara, J. B. Liu, Y. J. Sun, X. Liu, H. R. Qi, Serkant Ali Cetin, D. Y. Liu, J. B. Jiao, S. Q. Zhang, and Y. F. Wang
Subjects: Physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Detector, Root (chord), 01 natural sciences, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Born approximation, 010306 general physics, Energy (signal processing), Storage ring
Abstract: Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a center-of-mass energy of root s = 4.600 GeV, we search for the production of e(+)e(-) -> phi chi( ...
Published: 2018

223. Observation of $a^{0}_{0}(980)$-$f_{0}(980)$ Mixing

Author: M, Ablikim, M N, Achasov, S, Ahmed, M, Albrecht, M, Alekseev, A, Amoroso, F F, An, Q, An, J Z, Bai, Y, Bai, O, Bakina, R, Baldini Ferroli, Y, Ban, D W, Bennett, J V, Bennett, N, Berger, M, Bertani, D, Bettoni, J M, Bian, F, Bianchi, E, Boger, I, Boyko, R A, Briere, H, Cai, X, Cai, O, Cakir, A, Calcaterra, G F, Cao, S A, Cetin, J, Chai, J F, Chang, G, Chelkov, G, Chen, H S, Chen, J C, Chen, M L, Chen, S J, Chen, X R, Chen, Y B, Chen, X K, Chu, G, Cibinetto, H L, Dai, J P, Dai, A, Dbeyssi, D, Dedovich, Z Y, Deng, A, Denig, I, Denysenko, M, Destefanis, F, De Mori, Y, Ding, C, Dong, J, Dong, L Y, Dong, M Y, Dong, O, Dorjkhaidav, Z L, Dou, S X, Du, P F, Duan, J, Fang, S S, Fang, X, Fang, Y, Fang, R, Farinelli, L, Fava, S, Fegan, F, Feldbauer, G, Felici, C Q, Feng, E, Fioravanti, M, Fritsch, C D, Fu, Q, Gao, X L, Gao, Y, Gao, Y G, Gao, Z, Gao, B, Garillon, I, Garzia, K, Goetzen, L, Gong, W X, Gong, W, Gradl, M, Greco, M H, Gu, S, Gu, Y T, Gu, A Q, Guo, L B, Guo, R P, Guo, Y P, Guo, Z, Haddadi, S, Han, X Q, Hao, F A, Harris, K L, He, X Q, He, F H, Heinsius, T, Held, Y K, Heng, T, Holtmann, Z L, Hou, C, Hu, H M, Hu, T, Hu, Y, Hu, G S, Huang, J S, Huang, S H, Huang, X T, Huang, X Z, Huang, Z L, Huang, T, Hussain, W, Ikegami Andersson, Q, Ji, Q P, Ji, X B, Ji, X L, Ji, X S, Jiang, X Y, Jiang, J B, Jiao, Z, Jiao, D P, Jin, S, Jin, Y, Jin, T, Johansson, A, Julin, N, Kalantar-Nayestanaki, X L, Kang, X S, Kang, M, Kavatsyuk, B C, Ke, T, Khan, A, Khoukaz, P, Kiese, R, Kliemt, L, Koch, O B, Kolcu, B, Kopf, M, Kornicer, M, Kuemmel, M, Kuhlmann, A, Kupsc, W, Kühn, J S, Lange, M, Lara, P, Larin, L, Lavezzi, H, Leithoff, C, Leng, C, Li, Cheng, Li, D M, Li, F, Li, F Y, Li, G, Li, H B, Li, H J, Li, J C, Li, Jin, Li, K, Li, K J, Li, Lei, Li, P L, Li, P R, Li, Q Y, Li, T, Li, W D, Li, W G, Li, X L, Li, X N, Li, X Q, Li, Z B, Li, H, Liang, Y F, Liang, Y T, Liang, G R, Liao, D X, Lin, B, Liu, B J, Liu, C X, Liu, D, Liu, F H, Liu, Fang, Liu, Feng, Liu, H B, Liu, H H, Liu, H M, Liu, J B, Liu, J Y, Liu, K, Liu, K Y, Liu, Ke, Liu, L D, Liu, P L, Liu, Q, Liu, S B, Liu, X, Liu, Y B, Liu, Z A, Liu, Zhiqing, Liu, Y F, Long, X C, Lou, H J, Lu, J G, Lu, Y, Lu, Y P, Lu, C L, Luo, M X, Luo, X L, Luo, X R, Lyu, F C, Ma, H L, Ma, L L, Ma, M M, Ma, Q M, Ma, T, Ma, X N, Ma, X Y, Ma, Y M, Ma, F E, Maas, M, Maggiora, Q A, Malik, Y J, Mao, Z P, Mao, S, Marcello, Z X, Meng, J G, Messchendorp, G, Mezzadri, J, Min, T J, Min, R E, Mitchell, X H, Mo, Y J, Mo, C, Morales Morales, G, Morello, N Yu, Muchnoi, H, Muramatsu, A, Mustafa, Y, Nefedov, F, Nerling, I B, Nikolaev, Z, Ning, S, Nisar, S L, Niu, X Y, Niu, S L, Olsen, Q, Ouyang, S, Pacetti, Y, Pan, M, Papenbrock, P, Patteri, M, Pelizaeus, J, Pellegrino, H P, Peng, K, Peters, J, Pettersson, J L, Ping, R G, Ping, A, Pitka, R, Poling, V, Prasad, H R, Qi, M, Qi, S, Qian, C F, Qiao, N, Qin, X S, Qin, Z H, Qin, J F, Qiu, K H, Rashid, C F, Redmer, M, Richter, M, Ripka, M, Rolo, G, Rong, Ch, Rosner, A, Sarantsev, M, Savrié, C, Schnier, K, Schoenning, W, Shan, M, Shao, C P, Shen, P X, Shen, X Y, Shen, H Y, Sheng, J J, Song, W M, Song, X Y, Song, S, Sosio, C, Sowa, S, Spataro, G X, Sun, J F, Sun, L, Sun, S S, Sun, X H, Sun, Y J, Sun, Y K, Sun, Y Z, Sun, Z J, Sun, Z T, Sun, C J, Tang, G Y, Tang, X, Tang, I, Tapan, M, Tiemens, B T, Tsednee, I, Uman, G S, Varner, B, Wang, B L, Wang, D, Wang, D Y, Wang, Dan, Wang, K, Wang, L L, Wang, L S, Wang, M, Wang, P, Wang, P L, Wang, W P, Wang, X F, Wang, Y, Wang, Y D, Wang, Y F, Wang, Y Q, Wang, Z, Wang, Z G, Wang, Z H, Wang, Z Y, Wang, T, Weber, D H, Wei, J H, Wei, P, Weidenkaff, S P, Wen, U, Wiedner, M, Wolke, L H, Wu, L J, Wu, Z, Wu, L, Xia, Y, Xia, D, Xiao, H, Xiao, Y J, Xiao, Z J, Xiao, X H, Xie, Y G, Xie, Y H, Xie, X A, Xiong, Q L, Xiu, G F, Xu, J J, Xu, L, Xu, Q J, Xu, Q N, Xu, X P, Xu, L, Yan, W B, Yan, W C, Yan, Y H, Yan, H J, Yang, H X, Yang, L, Yang, Y H, Yang, Y X, Yang, M, Ye, M H, Ye, J H, Yin, Z Y, You, B X, Yu, C X, Yu, J S, Yu, C Z, Yuan, Y, Yuan, A, Yuncu, A A, Zafar, Y, Zeng, Z, Zeng, B X, Zhang, B Y, Zhang, C C, Zhang, D H, Zhang, H H, Zhang, H Y, Zhang, J, Zhang, J L, Zhang, J Q, Zhang, J W, Zhang, J Y, Zhang, J Z, Zhang, K, Zhang, L, Zhang, S Q, Zhang, X Y, Zhang, Y, Zhang, Y H, Zhang, Y T, Zhang, Yu, Zhang, Z H, Zhang, Z P, Zhang, Z Y, Zhang, G, Zhao, J W, Zhao, J Y, Zhao, J Z, Zhao, Lei, Zhao, Ling, Zhao, M G, Zhao, Q, Zhao, S J, Zhao, T C, Zhao, Y B, Zhao, Z G, Zhao, A, Zhemchugov, B, Zheng, J P, Zheng, W J, Zheng, Y H, Zheng, B, Zhong, L, Zhou, X, Zhou, X K, Zhou, X R, Zhou, X Y, Zhou, J, Zhu, K, Zhu, K J, Zhu, S, Zhu, S H, Zhu, X L, Zhu, Y C, Zhu, Y S, Zhu, Z A, Zhu, J, Zhuang, B S, Zou, and J H, Zou
Subjects: Subatomär fysik, High Energy Physics - Experiment (hep-ex), Physics and Astronomy (all), Subatomic Physics, FOS: Physical sciences, ddc:530, NO, High Energy Physics - Experiment
Abstract: Physical review letters 121(2), 022001 (2018). doi:10.1103/PhysRevLett.121.022001, We report the first observation of $a^{0}_{0}(980)$-$f_{0}(980)$ mixing in the decays of $J/\psi\to\phi f_{0}(980)\to\phi a^{0}_{0}(980)\to\phi\eta\pi^{0}$ and $\chi_{c1}\to a^{0}_{0}(980)\pi^{0}\to f_{0}(980)\pi^{0}\to\pi^{+}\pi^{-}\pi^{0}$, using data samples of $1.31\times10^{9}$ $J/\psi$ events and $4.48\times10^{8}$ $\psi(3686)$ events accumulated with the BESIII detector. The signals of $f_{0}(980)\to a^{0}_{0}(980)$ and $a^{0}_{0}(980)\to f_{0}(980)$ mixing are observed at levels of statistical significance of $7.4\sigma$ and $5.5\sigma$, respectively. The corresponding branching fractions and mixing intensities are measured and the constraint regions on the coupling constants, $g_{a_{0}K^{+}K^{-}}$ and $g_{f_{0}K^{+}K^{-}}$, are estimated. The results improve the understanding of the nature of $a^{0}_{0}(980)$ and $f_{0}(980)$., Published by APS, College Park, Md.
Published: 2018

224. Extreme Energy Events Project: construction of the detectors

Author: I. Gnesi, L. Votano, P. La Rocca, D. De Gruttola, Luca Baldini, G. Piragino, Marcello Abbrescia, M. Taiuti, S. Serci, Mario Nicola Mazziottai, M. Rizzi, V. V. Frolov, F. Carnesecchi, M. Panareo, C. Ripoli, S. Pisano, Rosario Nania, P. Galeotti, M. C. Vistoli, C. Avanzini, Giancarlo C. Righini, Corrado Cicalo, W. Park, M. Selvi, S. Squarcia, S. Grazzi, G. Sartorelli, A. Scribano, A. Zichichi, R. Zuyeuski, Giuseppe Mandaglio, Riccardo Paoletti, L. Perasso, G. Batignani, E. Bossini, G. Terreni, C. Gustavino, F. Palmonari, Andrea Chiavassa, Federico Pilo, F. Nozzoli, A. Corvaglia, Despina Hatzifotiadou, S. Miozzi, M. C. S. Williams, E. Coccia, Antonio Trifiro, G. Maron, Francesco Riggi, L. Zheng, M. Garbini, S. De Pasquale, F. Fabbri, M. Battaglieri, G. Gemme, Francesco Noferini, Eugenio Scapparone, M. Trimarchi, R. Baldini Ferroli, F. Coccetti, O. Maragoto Rodriguez, S. Boi, M. Schioppa, M. P. Panetta, Luisa Cifarelli, Carnesecchi, Francesca, Abbrescia, M., Avanzini, C., Baldini, Luca, Baldini Ferroli, R., Batignani, G., Battaglieri, M., Boi, S., Bossini, E., Chiavassa, Andrea, Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, Daniele, De Pasquale, S., Fabbri, Franco L., Frolov, V., Galeotti, P., Garbini, M., Gemme, G., Gnesi, Ivan, Grazzi, Stefano, Gustavino, C., Hatzifotiadou, Despina, La Rocca, P., Mandaglio, Giuseppe, Maragoto Rodriguez, O., Maron, G., Mazziottai, Mario Nicola, Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, Federico, Panareo, M., Panetta, M. P., Paoletti, Riccardo, Park, W., Perasso, L., Pilo, Federico, Piragino, G., Pisano, S., Riggi, F., Righini, G. C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, Marco, Scribano, A., Selvi, Marco, Serci, S., Squarcia, S., Taiuti, Mauro, Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, M. C., Votano, L., Williams, M. C. S., Zheng, L., Zichichi, A., Zuyeuski, R., Batignani, Giovanni, Cicalo, Corrado, Panetta, M.P., Riggi, Francesco, Righini, G.C., and Vistoli, M.C.
Subjects: Engineering, Large Hadron Collider, Multidisciplinary, business.industry, Detector, MRPC EEE, law.invention, Outreach, Telescope, MRPC, cosmic rays, extreme energy, Extensive Air Showers, Muon spectrometer, law, Quality monitoring, Detectors and Experimental Techniques, business, Telecommunications, Energy (signal processing), Fermi Gamma-ray Space Telescope
Abstract: The Extreme Energy Events (EEE) experiment is a strategic project of Centro Fermi dedicated to the study of extreme energy cosmic rays with an innovative outreach approach: high school students are directly involved in the experiment and play a primary role. EEE exploits a network of muon tracking telescopes constituted by three large area MRPCs. In this work we describe the detector design and the construction phase which is performed at CERN by high school students and teachers. The experiment is coordinated by Centro Fermi with collaboration from INFN, CERN, Ministero dell'Università e della Ricerca (MIUR).Nowadays 525252 telescope are installed all over Italy (3 105 km23~10^5~km^23 105 km2) and a total of 100 institutes participate monitoring the quality of the data and analysing them. The EEE Project is still expanding to enlarge the network, involving more schools.
Published: 2018

225. Search for long distance correlations between extensive air showers detected by the EEE network

Author: Marco Schioppa, C. Gustavino, S. Squarcia, G. Piragino, Rosario Nania, A. Scribano, Francesco Noferini, C. Ripoli, Despina Hatzifotiadou, M. P. Panetta, M. Selvi, P. Galeotti, Eugenio Scapparone, S. Pisano, M. Garbini, Corrado Cicalo, M. C. S. Williams, A. Chiavassa, M. C. Vistoli, G. Maron, S. Serci, F. L. Fabbri, G. Batignani, S. De Pasquale, M. Panareo, S. Grazzi, A. Trifirò, M. Battaglieri, Gabriella Sartorelli, I. Gnesi, Riccardo Paoletti, L. Perasso, G. Terreni, Luisa Cifarelli, W. Park, Fabrizio Giulio Luca Pilo, F. Carnesecchi, E. Coccia, F. Palmonari, Giancarlo C. Righini, A. Zichichi, F. Coccetti, R. Baldini Ferroli, M. N. Mazziotta, E. Bossini, P. La Rocca, Luca Baldini, D. De Gruttola, Marcello Abbrescia, Giuseppe Mandaglio, F. Nozzoli, L. Votano, S. Miozzi, M. Trimarchi, V. V. Frolov, O. Maragoto Rodriguez, S. Boi, G. Gemme, R. Zuyeuski, Francesco Riggi, L. Zheng, M. Taiuti, Abbrescia, M., Baldini, L., Baldini Ferroli, R., Batignani, G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., De Gruttola, D., De Pasquale, S., Fabbri, F.L., Frolov, V., Galeotti, P., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., La Rocca, P., Mandaglio, G., Maragoto Rodriguez, O., Maron, G., Mazziotta, M.N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M.P., Paoletti, R., Park, W., Perasso, L., Pilo, F., Piragino, G., Pisano, S., Riggi, F., Righini, G.C., Ripoli, C., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, M.C., Votano, L., Williams, M.C.S., Zheng, L., Zichichi, A., Zuyeuski, R., Fabbri, F. L., Mazziotta, M. N., Panetta, M. P., Righini, G. C., Vistoli, M. C., and Williams, M. C. S.
Subjects: Physics, 010308 nuclear & particles physics, Angular distance, Cosmic Rays, air showers, Extreme Energy Events, Multigap Resistive Plate Chambers, Anomaly (natural sciences), array telescope, General Physics and Astronomy, Cosmic ray, Extensive Air Shower, Astrophysics, 01 natural sciences, Coincidence, Confidence interval, law.invention, Telescope, Physics and Astronomy (all), law, 0103 physical sciences, MRPC, Cosmic rays, Extensive Air Showers, MRPC, 010306 general physics, Spurious relationship, Event (particle physics), cosmic ray
Abstract: A search for long distance correlations between individual Extensive Air Showers (EAS) detected by pairs of MRPC telescopes of the Extreme Energy Events (EEE) network was carried out. The search for an anomaly in these events is the purpose of our work. A dataset obtained by all the possible 45 pairs between 10 EEE cluster sites (hosting at least two telescopes), located at relative distances between 86 and 1200km, was analyzed, corresponding to an overall period of 3968 days time exposure. To estimate the possible event excess with respect to the spurious rate, the number of coincidence events was extracted as a function of the time difference between the arrival of the showers in the two sites, from $\pm 10$ s to the smallest time interval where events are still observed. The analysis was done taking into account both the time and orientation correlation between the showers detected by the telescope pairs. A few candidate events with unusually small time difference and angular distance were observed, with a p-value sensibly smaller than a confidence level of 0.05.
Published: 2018

226. A new inner tracker based on GEM detectors for the BES III experiment

Author: M. Greco, M. Da Rocha Rolo, N. Canale, D. Bettoni, S. Spataro, Gianfranco Morello, S. Pacetti, E. Tskhadadze, A. Pelosi, M. Bertani, Cy. Leng, I. Garzia, M. Destefanis, L. Fava, Li Yan, F. De Mori, S. Sosio, S. Chiozzi, Marco Mignone, G. Mezzadri, G. Cibinetto, V. Carassiti, G. Felici, E. Soldani, J. Dong, F. Evangelisti, R. Baldini Ferroli, R. Farinelli, Richard Wheadon, A. Cotta Ramusino, H. J. Li, L. Lavezzi, A. Calcaterra, P. Patteri, F. Bianchi, M.G. Alexeev, J. Pellegrino, M. Melchiorri, M. Maggiora, A. Amoroso, F. Cossio, Angelo Rivetti, E. Fioravanti, S. Verma, M. Capodiferro, S. Cerioni, R. Malaguti, M. Savrie, M. Scodeggio, S. Marcello, J. Y. Chai, and M. Gatta
Subjects: Physics, Spectrometer, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Detector, MicroMegas detector, 01 natural sciences, Optics, 0103 physical sciences, High Energy Physics::Experiment, Current (fluid), 010306 general physics, business
Abstract: A new inner tracker based on a cylindrical gas electron-multiplier detector is under development to replace the current inner drift chamber of the BES III spectrometer. The BES III experiment is carried out at the BEPC II e[Formula: see text]e[Formula: see text] collider in Beijing at center-of-mass energies in the tau-charm region with a design luminosity of 1.0 [Formula: see text] 10[Formula: see text] cm[Formula: see text]s[Formula: see text]. The new inner tracker consists of three cylindrical layers of triple GEM surrounding the interaction point, covering 93% of solid angle. To fulfill physics requirements, a spatial resolution of 130 μm must be achieved. Both planar and cylindrical prototypes have been built and tested. A custom ASIC using UMC 110-nm technology has been designed to provide charge and time measurements—the first prototype is in testing. Notable and innovative aspects of the new inner tracker and the performance of the detector prototypes and readout ASIC are reported here.
Published: 2018
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227. GEM detector performance with innovative micro-TPC readout in high magnetic field

Author: Marco Mignone, J. Pellegrino, G. Mezzadri, R. Baldini Ferroli, E. Tskhadadze, M. Savrie, S. Marcello, E. Fioravanti, S. Verma, M. Melchiorri, F. De Mori, J. Y. Chai, M. Capodiferro, M. Bertani, S. Chiozzi, P. Patteri, F. Bianchi, A. Calcaterra, M. Scodeggio, Li Yan, A. Pelosi, S. Cerioni, E. Soldani, R. Malaguti, M. Gatta, R. Farinelli, M.G. Alexeev, J. Dong, V. Cassariti, Gianfranco Morello, S. Pacetti, Richard Wheadon, A. Cotta Ramusino, G. Felici, F. Evangelisti, A. Amoroso, H. J. Li, Angelo Rivetti, G. Cibinetto, I. Garzia, M. Greco, N. Canale, L. Lavezzi, S. Spataro, Cy. Leng, M. Maggiora, L. Fava, M. Rolo, F. Cossio, S. Sosio, D. Bettoni, and M. Destefanis
Subjects: Physics::Instrumentation and Detectors, QC1-999, STRIPS, Tracking (particle physics), 01 natural sciences, NO, 030218 nuclear medicine & medical imaging, law.invention, 03 medical and health sciences, Physics and Astronomy (all), 0302 clinical medicine, Planar, Optics, law, 0103 physical sciences, Gas detector, Detectors and Experimental Techniques, Image resolution, Physics, Time projection chamber, 010308 nuclear & particles physics, business.industry, Detector, Magnetic field, business
Abstract: Gas detector development is one of the pillars of the research in fundamental physics. Since several years, a new concept of detectors, called Micro Pattern Gas Detector (MPGD), allowed to overcome several problems related to other types of commonly used detectors, like drift chamber and micro strips detectors, reducing the rate of discharges and providing better radiation tolerance. Among the most used MPGDs are the Gas Electron Multipliers (GEMs). Invented by Sauli in 1997, nowadays GEMs have become an important reality for particle detectors in high energy physics. Commonly deployed as fast timing detectors and triggers, their fast response, high rate capability and high radiation hardness make them also suitable as tracking detectors. The readout scheme is one of the most important features in tracking technology. Analog readout based on the calculation of the center of gravity technique allows to overcome the limit imposed by digital pads, whose spatial resolution is limited by the pitch dimensions. However, the presence of high external magnetic fields can distort the electronic cloud and affect the performance. The development of the micro-TPC reconstruction method brings GEM detectors into a new prospective, improving significantly the spatial resolutionin presence of high magnetic fields. This innovative technique allows to reconstruct the 3-dimensional particle position, as Time Projection Chamber, but within a drift gap of a few millimeters. In these report, the charge centroid and micro-TPC methods are described in details. We discuss the results of several test beams performed with planar chambers in magnetic field. These results are one of the first developments of micro-TPC technique for GEM detectors, which allows to reach unprecedented performance in a high magnetic field of 1 T.
Published: 2018

228. The Extreme Energy Events experiment: An overview of the telescopes performance

Author: R. Paoletti, V. V. Frolov, Rosario Nania, C. Avanzini, M. Selvi, S. Pisano, C. Gustavino, A. Chiavassa, S. Serci, G. Batignani, G. Piragino, A. Scribano, L. Galante, L. Votano, Giancarlo C. Righini, C. Ripoli, C. Cicalo, Giuseppe Mandaglio, R. Zuyeuski, F. L. Fabbri, G. Gemme, M. C. Vistoli, M. C. S. Williams, S. Grazzi, F. Nozzoli, R. Baldini Ferroli, F. Carnesecchi, E. Coccia, G. Terreni, Luca Baldini, L. Perasso, I. Gnesi, F. Coccetti, Marcello Abbrescia, M. Rizzi, Fabrizio Giulio Luca Pilo, Francesco Riggi, Eugenio Scapparone, C. Pellegrino, M. N. Mazziotta, Antonio Trifiro, G. Maron, P. La Rocca, D. De Gruttola, S. De Pasquale, A. Corvaglia, D. Hatzifotiadou, M. Panareo, L. Zheng, W. Park, Luisa Cifarelli, M. Trimarchi, G. Sartorelli, F. Palmonari, O. Maragoto Rodriguez, S. Boi, M. Garbini, M. Battaglieri, S. Miozzi, A. Zichichi, E. Bossini, M. Taiuti, Marco Schioppa, S. Squarcia, Francesco Noferini, M. P. Panetta, P. Galeotti, Abbrescia, M., Avanzini, C., Baldini, L., Ferroli, R. Baldini, Batignani, G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, D., De Pasquale, S., Fabbri, F.L., Frolov, V., Galante, L., Galeotti, P., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., Rocca, P. La, Mandaglio, G., Rodriguez, O. Maragoto, Maron, G., Mazziotta, M.N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M.P., Paoletti, R., Park, W., Pellegrino, C., Perasso, L., Pilo, F., Piragino, G., Pisano, S., Riggi, F., Righini, G.C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifiro, A., Trimarchi, M., Vistoli, M.C., Votano, L., Williams, M.C.S., Zheng, L., Zichichi, A., Zuyeuski, R., Gruttola, D. De, Pasquale, S. De, Fabbri, F. L., Mazziotta, M. N., Panetta, M. P., Righini, G. C., Trifirò, A., Vistoli, M. C., and Williams, M. C. S.
Subjects: Physics - Instrumentation and Detectors, Performance of High Energy Physics Detector, FOS: Physical sciences, Extensive Air Shower, Multigap Resistive Plate Chamber, Particle tracking detectors, Performance of High Energy Physics Detectors, Resistive-plate chambers, Timing detectors, Cosmic Ray, 01 natural sciences, Resistiveplate chambers, RESISTIVE PLATE CHAMBERS, Muon spectrometer, Instrumentation, Mathematical Physics, 0103 physical sciences, Detectors and Experimental Techniques, 010306 general physics, physics.ins-det, Physics, Large Hadron Collider, 010308 nuclear & particles physics, Resistive plate chamber, Astronomy, COSMIC-RAY TESTS, Time resolution, Instrumentation and Detectors (physics.ins-det), Particle tracking detector, Timing detector, Resistiveplate chamber, Particle tracking detectors, Performance of High Energy Physics Detectors, Resistiveplate chambers, Timing detectors, Instrumentation, Mathematical Physics, Energy (signal processing)
Abstract: Multigap Resistive Plate Chambers (MRPC). The EEE network is composed, so far, of 53 telescopes, each made of three MRPC detectors; it is organized in clusters and single telescope stations distributed all over the Italian territory and installed in High Schools, covering an area larger than $3\times10^{5}$ km$^{2}$. The study of Extensive Air Showers (EAS), that is one of the goal of the project, requires excellent performance in terms of time and spatial resolution, efficiency, tracking capability and long term stability. The data from two recent coordinated data taking periods, named Run 2 and Run 3, have been used to measure these quantities and the results are here reported, together with a comparison with expectations and with the results from a beam test performed in 2006 at CERN., 21 pages, 17 figures
Published: 2018

229. Measurement of singly Cabibbo-suppressed decays D-0 → π0π0π0, π0π0η, π0ηη and ηηη

Author: M. Ablikim, M.N. Achasov, S. Ahmed, M. Albrecht, A. Amoroso, F.F. An, Q. An, J.Z. Bai, Y. Bai, O. Bakina, R. Baldini Ferroli, Y. Ban, D.W. Bennett, J.V. Bennett, N. Berger, M. Bertani, D. Bettoni, J.M. Bian, F. Bianchi, E. Boger, I. Boyko, R.A. Briere, H. Cai, X. Cai, O. Cakir, A. Calcaterra, G.F. Cao, S.A. Cetin, J. Chai, J.F. Chang, G. Chelkov, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, P.L. Chen, S.J. Chen, X.R. Chen, Y.B. Chen, X.K. Chu, G. Cibinetto, H.L. Dai, J.P. Dai, A. Dbeyssi, D. Dedovich, Z.Y. Deng, A. Denig, I. Denysenko, M. Destefanis, F. De Mori, Y. Ding, C. Dong, J. Dong, L.Y. Dong, M.Y. Dong, Z.L. Dou, S.X. Du, P.F. Duan, J. Fang, S.S. Fang, Y. Fang, R. Farinelli, L. Fava, S. Fegan, F. Feldbauer, G. Felici, C.Q. Feng, E. Fioravanti, M. Fritsch, C.D. Fu, Q. Gao, X.L. Gao, Y. Gao, Y.G. Gao, Z. Gao, B. Garillon, I. Garzia, K. Goetzen, L. Gong, W.X. Gong, W. Gradl, M. Greco, M.H. Gu, Y.T. Gu, A.Q. Guo, R.P. Guo, Y.P. Guo, Z. Haddadi, S. Han, X.Q. Hao, F.A. Harris, K.L. He, X.Q. He, F.H. Heinsius, T. Held, Y.K. Heng, T. Holtmann, Z.L. Hou, H.M. Hu, T. Hu, Y. Hu, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Huang, T. Hussain, W. Ikegami Andersson, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Ji, X.S. Jiang, X.Y. Jiang, J.B. Jiao, Z. Jiao, D.P. Jin, S. Jin, Y. Jin, T. Johansson, A. Julin, N. Kalantar-Nayestanaki, X.L. Kang, X.S. Kang, M. Kavatsyuk, B.C. Ke, T. Khan, A. Khoukaz, P. Kiese, R. Kliemt, L. Koch, O.B. Kolcu, B. Kopf, M. Kornicer, M. Kuemmel, M. Kuessner, M. Kuhlmann, A. Kupsc, W. Kühn, J.S. Lange, M. Lara, P. Larin, L. Lavezzi, H. Leithoff, C. Leng, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, Jin Li, K.J. Li, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Z.B. Li, H. Liang, Y.F. Liang, Y.T. Liang, G.R. Liao, D.X. Lin, B. Liu, B.J. Liu, C.X. Liu, D. Liu, F.H. Liu, Fang Liu, Feng Liu, H.B. Liu, H.M. Liu, Huanhuan Liu, Huihui Liu, J.B. Liu, J.Y. Liu, K. Liu, K.Y. Liu, Ke Liu, L.D. Liu, P.L. Liu, Q. Liu, S.B. Liu, X. Liu, Y.B. Liu, Z.A. Liu, Zhiqing Liu, Y.F. Long, X.C. Lou, H.J. Lu, J.G. Lu, Y. Lu, Y.P. Lu, C.L. Luo, M.X. Luo, X.L. Luo, X.R. Lyu, F.C. Ma, H.L. Ma, L.L. Ma, M.M. Ma, Q.M. Ma, T. Ma, X.N. Ma, X.Y. Ma, Y.M. Ma, F.E. Maas, M. Maggiora, Q.A. Malik, Y.J. Mao, Z.P. Mao, S. Marcello, Z.X. Meng, J.G. Messchendorp, G. Mezzadri, J. Min, T.J. Min, R.E. Mitchell, X.H. Mo, Y.J. Mo, C. Morales Morales, N.Yu. Muchnoi, H. Muramatsu, A. Mustafa, Y. Nefedov, F. Nerling, I.B. Nikolaev, Z. Ning, S. Nisar, S.L. Niu, X.Y. Niu, S.L. Olsen, Q. Ouyang, S. Pacetti, Y. Pan, M. Papenbrock, P. Patteri, M. Pelizaeus, J. Pellegrino, H.P. Peng, K. Peters, J. Pettersson, J.L. Ping, R.G. Ping, A. Pitka, R. Poling, V. Prasad, H.R. Qi, M. Qi, S. Qian, C.F. Qiao, N. Qin, X.S. Qin, Z.H. Qin, J.F. Qiu, K.H. Rashid, C.F. Redmer, M. Richter, M. Ripka, M. Rolo, G. Rong, Ch. Rosner, A. Sarantsev, M. Savrié, C. Schnier, K. Schoenning, W. Shan, M. Shao, C.P. Shen, P.X. Shen, X.Y. Shen, H.Y. Sheng, J.J. Song, W.M. Song, X.Y. Song, S. Sosio, C. Sowa, S. Spataro, G.X. Sun, J.F. Sun, L. Sun, S.S. Sun, X.H. Sun, Y.J. Sun, Y.K. Sun, Y.Z. Sun, Z.J. Sun, Z.T. Sun, C.J. Tang, G.Y. Tang, X. Tang, I. Tapan, M. Tiemens, B. Tsednee, I. Uman, G.S. Varner, B. Wang, B.L. Wang, D. Wang, D.Y. Wang, Dan Wang, K. Wang, L.L. Wang, L.S. Wang, M. Wang, Meng Wang, P. Wang, P.L. Wang, W.P. Wang, X.F. Wang, Y. Wang, Y.D. Wang, Y.F. Wang, Y.Q. Wang, Z. Wang, Z.G. Wang, Z.Y. Wang, Zongyuan Wang, T. Weber, D.H. Wei, P. Weidenkaff, S.P. Wen, U. Wiedner, M. Wolke, L.H. Wu, L.J. Wu, Z. Wu, L. Xia, Y. Xia, D. Xiao, H. Xiao, Y.J. Xiao, Z.J. Xiao, Y.G. Xie, Y.H. Xie, X.A. Xiong, Q.L. Xiu, G.F. Xu, J.J. Xu, L. Xu, Q.J. Xu, Q.N. Xu, X.P. Xu, L. Yan, W.B. Yan, W.C. Yan, Y.H. Yan, H.J. Yang, H.X. Yang, L. Yang, Y.H. Yang, Y.X. Yang, M. Ye, M.H. Ye, J.H. Yin, Z.Y. You, B.X. Yu, C.X. Yu, J.S. Yu, C.Z. Yuan, Y. Yuan, A. Yuncu, A.A. Zafar, Y. Zeng, Z. Zeng, B.X. Zhang, B.Y. Zhang, C.C. Zhang, D.H. Zhang, H.H. Zhang, H.Y. Zhang, J. Zhang, J.L. Zhang, J.Q. Zhang, J.W. Zhang, J.Y. Zhang, J.Z. Zhang, K. Zhang, L. Zhang, S.Q. Zhang, X.Y. Zhang, Y.H. Zhang, Y.T. Zhang, Yang Zhang, Yao Zhang, Yu Zhang, Z.H. Zhang, Z.P. Zhang, Z.Y. Zhang, G. Zhao, J.W. Zhao, J.Y. Zhao, J.Z. Zhao, Lei Zhao, Ling Zhao, M.G. Zhao, Q. Zhao, S.J. Zhao, T.C. Zhao, Y.B. Zhao, Z.G. Zhao, A. Zhemchugov, B. Zheng, J.P. Zheng, Y.H. Zheng, B. Zhong, L. Zhou, X. Zhou, X.K. Zhou, X.R. Zhou, X.Y. Zhou, J. Zhu, K. Zhu, K.J. Zhu, S. Zhu, S.H. Zhu, X.L. Zhu, Y.C. Zhu, Y.S. Zhu, Z.A. Zhu, J. Zhuang, B.S. Zou, J.H. Zou, and Research unit Nuclear & Hadron Physics
Subjects: Nuclear and High Energy Physics, Electron–positron annihilation, Analytical chemistry, 01 natural sciences, NO, Luminosity, Subatomär fysik, Hadronic decays, E(+)E(-), 0103 physical sciences, Subatomic Physics, BESIII, Branching fractions, D0 meson, ddc:530, 010306 general physics, Nuclear Experiment, Physics, D 0 meson, 010308 nuclear & particles physics, Branching fraction, lcsh:QC1-999, D-0 meson, D0meson, High Energy Physics::Experiment, COUPLED-CHANNEL ANALYSIS, lcsh:Physics
Abstract: Physics letters / B B 781, 368 - 375 (2018). doi:10.1016/j.physletb.2018.04.017, Using a data sample of $e^+e^-$ collision data corresponding to an integrated luminosity of 2.93 $fb^{-1}$ collected with the BESIII detector at a center-of-mass energy of $\sqrt{s}= 3.773~GeV$,we search for the singly Cabibbo-suppressed decays $D^{0}\to\pi^{0}\pi^{0}\pi^{0}$, $\pi^{0}\pi^{0}\eta$, $\pi^{0}\eta\eta$ and $\eta\eta\eta$ using the double tag method. The absolute branching fractions are measured to be $\mathcal{B}(D^{0}\to\pi^{0}\pi^{0}\pi^{0}) = (2.0 \pm 0.4 \pm 0.3)\times 10^{-4}$, $\mathcal{B}(D^{0}\to\pi^{0}\pi^{0}\eta) = (3.8 \pm 1.1 \pm 0.7)\times 10^{-4}$ and $\mathcal{B}(D^{0}\to\pi^{0}\eta\eta) = (7.3 \pm 1.6 \pm 1.5)\times 10^{-4}$ with the statistical significances of $4.8\sigma$, $3.8\sigma$ and $5.5\sigma$, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of $D^{0}\to\eta\eta\eta$ is found, and the upper limit on its decay branching fraction is set to be $\mathcal{B}(D^{0}\to\eta\eta\eta) < 1.3 \times 10^{-4}$ at the $90\%$ confidence level., Published by North-Holland Publ., Amsterdam
Published: 2018

230. Measurement of e+ e- → DD cross sections at the ψ(3770) resonance

Author: T. Hussain, X. Y. Ma, W. X. Gong, M. Maggiora, G. Y. Tang, X. H. Sun, J. Q. Zhang, S. L. Niu, F. De Mori, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, K. Y. Liu, L. M. Gu, Z. B. Li, W. Ikegami Andersson, Jie Zhao, P. Kiese, C. Sowa, J. M. Bian, S. J. Zhao, Meng Wang, S. L. Olsen, R. A. Briere, Y. B. Zhao, S. Leiber, D. X. Lin, X. Y. Zhou, H. M. Hu, X. S. Jiang, P. L. Wang, V. Prasad, L. J. Wu, B. X. Yu, Zhi Zeng, S. Han, O. Cakir, T. Khan, Yi-Tao Wang, Xiao-Rui Lyu, M. Bertani, Z. Haddadi, J. W. Zhang, J. Dong, Muhammad Irshad, Kai Liu, X. Xia, J. H. Yin, L. Yang, Guangshun Huang, L. Yan, M. Kuessner, M. Alekseev, Y. Q. Wang, M. Shao, Y. T. Gu, Q. J. Xu, G. R. Liao, J. C. Chen, Xuanhong Lou, H. S. Chen, X. Y. Niu, Dean Liu, X. F. Wang, J. Libby, R. Farinelli, Y. G. Gao, X D Shi, Y. J. Mao, S. Nisar, C. J. Tang, Y. J. Mo, Nasser Kalantar-Nayestanaki, L. Zhang, Y. Nefedov, J. Zhu, F. Feldbauer, K. Goetzen, Yaquan Fang, B. Q. Wang, G. S. Varner, Z. L. Huang, Y. Hu, Y. P. Lu, Y. H. Zheng, C. Morales Morales, X. K. Zhou, Fang Liu, T. Y. Qi, I. Denysenko, W. C. Yan, H. L. Ma, A. Calcaterra, Z. G. Zhao, S. Fegan, L. Z. Liao, L. H. Wu, M. Savrie, Q. M. Ma, A. Mustafa, S. F. Zhang, D. M. Li, H. L. Dai, Igor Boyko, Cong-Feng Qiao, H. X. Yang, I. Garzia, F. A. Harris, W. L. Chang, A. Pitka, E. Fioravanti, M. Albrecht, Feng Liu, Z. G. Wang, H. Y. Zhang, Y. X. Xia, S. H. Zhu, Haiwen Liu, X. L. Ji, H. H. Zhang, Yi Jin, H. Leithoff, X. L. Luo, M. Ablikim, Y. T. Tan, N. Yu. Muchnoi, K. Begzsuren, J. F. Sun, X. S. Kang, W. Gradl, Y. F. Wang, D. Xiao, M. Ripka, F. Li, Z. J. Sun, Y. Yuan, Y. S. Zhu, Yu Zhang, Zhiqing Liu, J. W. Li, L. Xia, G. F. Chen, M. Pelizaeus, Ke Wang, W. D. Li, Cui Li, Y. H. Zhang, Magnus Wolke, Y. F. Liang, B. Y. Zhang, X. Y. Jiang, D. Y. Wang, S. Marcello, S. L. Yang, J. Y. Zhang, F. Bianchi, F. C. Ma, M. Qi, Y. J. Xiao, T. Holtmann, Y. Zeng, D. P. Jin, Q. Liu, A. Sarantsev, D. H. Wei, P. R. Li, H. J. Yang, B. T. Tsednee, J. S. Lange, K. Schoenning, Q. Y. Li, B. S. Zou, T. Johansson, J. F. Chang, S. Lusso, Z. Y. Wang, I. Uman, Niklaus Berger, Q. P. Ji, Y. H. Xie, H. B. Li, J. Y. Liu, X. D. Ruan, X. B. Ji, M. Tiemens, B. Garillon, Q. A. Malik, Dayong Wang, G. Mezzadri, N. Qin, Huihui Liu, Y. K. Heng, A. G. Denig, C. L. Luo, X. Q. He, J. Pellegrino, O. B. Kolcu, Q. Zhou, L. L. Ma, L. Gong, Z. X. Meng, P. F. Duan, Gianfranco Morello, X. Cai, Y. Pan, P. Patteri, Liqing Xu, J. Chai, X. Y. Shen, Ling Zhao, W. M. Song, L. Lavezzi, C. C. Zhang, Q. Gao, Y. N. Gao, M. N. Achasov, Fenfen An, G. A. Chelkov, X. A. Xiong, L. P. Zhou, Michael Papenbrock, F. Yan, A. A. Zafar, B. L. Wang, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, G. X. Sun, J. V. Bennett, P. Larin, Z. Jiao, Fu-Hu Liu, Y. Ding, J. G. Messchendorp, Y. Zhang, B. Zhong, L. B. Guo, R. Kliemt, M. Rolo, J. P. Dai, Lei Zhao, Q. An, X. Q. Hao, Y. M. Ma, G. F. Xu, J. F. Qiu, A. Amoroso, J. J. Song, I. Tapan, T. C. Zhao, M. Richter, D. H. Zhang, Z. P. Mao, A. Mangoni, B. J. Liu, S. B. Liu, X. H. Mo, L. S. Wang, Z. L. Hou, A. Guskov, M. G. Zhao, Y. H. Yang, R. P. Guo, Huanhuan Liu, Z. Ning, A. Zhemchugov, H. Muramatsu, A. N. Zhu, L. Fava, Y. H. Yan, L. Sun, G. Felici, Z. J. Xiao, A. Dbeyssi, M. H. Ye, Jun-Yi Zhang, S. Nakhoul, Jie Yu, Y. P. Guo, Ulrich Wiedner, Qiunan Xu, Tao Zhang, Bibo Ke, Minglin Ma, J. W. Zhao, W. B. Yan, J. Min, L. Koch, A. Khoukaz, K. H. Rashid, Z. P. Zhang, M. Kornicer, W. Kühn, J. Fang, Tao Li, S. Ahmed, Y. X. Yang, Kang Li, Z. Gao, Y. C. Zhu, B. Kopf, L. L. Wang, H. Cai, X. Y. Song, T. J. Min, K. J. Zhu, P. L. Chen, Z. Y. You, A. Yuncu, Z. A. Zhu, Yang Zhang, K. L. He, D. W. Bennett, A. Q. Guo, Z. Y. Peng, C. W. Wang, G. Rong, G. Cibinetto, C. Z. Yuan, S. Pacetti, Xiaozhong Huang, Xu Shan, R. Baldini Ferroli, Klaus Peters, Y. T. Liang, Ch. Rosner, D. Toth, Zujian Wang, T. Weber, M. Z. Wang, Jimin Zhao, Y. Bai, J. C. Li, A. Julin, J. J. Xu, H. J. Li, P. L. Li, S. J. Chen, Y. G. Xie, Bingxuan Liu, M. Kuemmel, Matthew Glenn Kurth, S. Jin, J. Zhuang, H. Liang, Q. Zhao, Y. Z. Sun, I. B. Nikolaev, X. N. Ma, Andrzej Kupsc, Q. L. Xiu, X. N. Li, K. J. Li, J. S. Huang, Yao Zhang, C. P. Shen, A. Zallo, M. X. Luo, G. Li, L. D. Liu, A. Gilman, Xiang Zhou, Ke Li, W. Shan, S. X. Du, T. Held, D. V. Dedovich, M. L. Chen, C. X. Liu, L. Y. Dong, Zongyuan Wang, M. Y. Dong, C. D. Fu, C. X. Lin, M. Fritsch, Gang Zhao, Haiping Peng, C. Q. Feng, X. R. Chen, M. Kavatsyuk, Z. Y. Deng, Z. L. Dou, W. P. Wang, H. B. Liu, Ke Liu, W. J. Zheng, F. Nerling, Xingguo Li, J. H. Zou, Q. Ouyang, Z. H. Qin, B. X. Zhang, S. S. Sun, S. S. Fang, W. G. Li, X. S. Qin, C. F. Redmer, C. Schnier, Y. B. Liu, Y. K. Sun, Dan Wang, X. T. Huang, R. E. Mitchell, S. Spataro, X. P. Xu, Lei Li, G. F. Cao, Z. T. Sun, Z. A. Liu, Y. Ban, P. Weidenkaff, F. H. Heinsius, S. P. Wen, X. R. Zhou, Cheng Li, X. K. Chu, J. F. Hu, Zhiyong Zhang, J. L. Zhang, M. H. Gu, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, H. J. Lu, J. G. Lu, F. E. Maas, T. Hu, O. Bakina, P. X. Shen, Z. Wu, Zhiqing Zhang, X. Liu, H. R. Qi, Serkant Ali Cetin, S. Qian, Jialun Ping, K. Zhang, X. Y. Zhang, M. Lara, J. B. Liu, Y. J. Sun, Yifan Yang, E. Boger, D. Y. Liu, J. B. Jiao, X. L. Gao, C. Dong, S. Sosio, Joachim Pettersson, Yunlong Zhang, H. L. Liu, D. Bettoni, R. Poling, Jianping Zheng, S. Zhu, M. Destefanis, X. Tang, F. Cossio, Research unit Nuclear & Hadron Physics, and İstanbul Arel Üniversitesi
Subjects: Particle physics, Nuclear and High Energy Physics, Meson, charm mesons, Electron–positron annihilation, 01 natural sciences, Resonance (particle physics), BESIII/BEPCII, law.invention, High Energy Physics - Experiment, NO, law, 0103 physical sciences, ddc:530, 010306 general physics, Collider, Instrumentation, DECAY LIBRARY TAUOLA, Physics, Luminosity (scattering theory), Annihilation, 010308 nuclear & particles physics, Sigma, cross sections, Astronomy and Astrophysics, High Energy Physics::Experiment, Bar (unit)
Abstract: Chinese physics / C High energy physics and nuclear physics C 42(8), 083001 (2018). doi:10.1088/1674-1137/42/8/083001, We report new measurements of the cross sections for the production of D Dbar final states at the psi(3770) resonance. Our data sample consists of an integrated luminosity of 2.93/fb of e+e- annihilation data produced by the BEPCII collider and collected and analyzed with the BESIII detector. We exclusively reconstruct three D0 and six D+ hadronic decay modes and use the ratio of the yield of fully reconstructed D Dbar events ('double tags') to the yield of all reconstructed D or Dbar mesons ('single tags') to determine the number of D0 D0bar and D+D- events, benefiting from the cancellation of many systematic uncertainties. Combining these yields with an independent determination of the integrated luminosity of the data sample, we find the cross sections to be \sigma(e+e- --> D0 D0bar)=(3.615 +- 0.010 +- 0.038) nb and \sigma(e+e- --> D+D-)=(2.830 +- 0.011 +- 0.026) nb, where the uncertainties are statistical and systematic, respectively., Published by IOP Publ., Bristol [u.a.]
Published: 2018

231. Test beam results with prototypes for the new Cylindrical GEM Inner Tracker of the BESIII experiment

Author: L. Lavezzi, M. Alexeev, A. Amoroso, R. Baldini Ferroli, M. Bertani, D. Bettoni, F. Bianchi, A. Calcaterra, N. Canale, M. Capodiferro, V. Carassiti, S. Cerioni, JY. Chai, S. Chiozzi, G. Cibinetto, F. Cossio, A. Cotta Ramusino, F. De Mori, M.Destefanis, J. Dong, F. Evangelisti, R. Farinelli, L. Fava, G. Felici, E. Fioravanti, I. Garzia, M. Gatta, M. Greco, CY. Leng, H. Li, M. Maggiora, and R. Malaguti
Published: 2018
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232. Test of new eco-gas mixtures for the multigap resistive plate chambers of the EEE project

Author: M. Panareo, F. L. Fabbri, M. Taiuti, A. Scribano, M. C. Vistoli, G. Gemme, Marco Schioppa, Francesco Noferini, W. Park, L. G. Batignani, S. Grazzi, Despina Hatzifotiadou, C. Gustavino, S. Miozzi, G. Sartorelli, Fabrizio Giulio Luca Pilo, Luca Baldini, S. Squarcia, Riccardo Paoletti, G. Terreni, G. Piragino, S. Pisano, M. Garbini, Marcello Abbrescia, E. Scapparone, D. De Gruttola, M. P. Panetta, M. C. S. Williams, M. Rizzi, F. Coccetti, M. Battaglieri, S. Serci, Francesco Riggi, L. Perasso, M. N. Mazziotta, G. Maron, M. Trimarchi, Giuseppe Mandaglio, F. Carnesecchi, E. Coccia, O. Maragoto Rodriguez, S. Boi, Antonino Zichichi, R. Baldini Ferroli, F. Nozzoli, A. Trifirò, C. Ripoli, E. Bossini, F. Palmonari, L. Votano, C. Pellegrino, A. Corvaglia, R. Zuyeuski, C. Cicalò, P. Galeotti, P. La Rocca, Rosario Nania, L. Galante, C. Avanzini, M. Selvi, A. Chiavassa, Giancarlo C. Righini, I. Gnesi, L. Zheng, Vladimir Frolov, L. Cifarelli, S. De Pasquale, Trimarchi M., Abbrescia M., Avanzini C., Baldini L., Ferroli R.B., Batignani L.G., Battaglieri M., Boi S., Bossini E., Carnesecchi F., Chiavassa A., Cicalo C., Cifarelli L., Coccetti F., Coccia E., Corvaglia A., De Gruttola D., De Pasquale S., Fabbri F., Frolov V., Galante L., Galeotti P., Garbini M., Gemme G., Gnesi I., Grazzi S., Gustavino C., Hatzifotiadou D., Rocca P.L., Mandaglio G., Rodriguez O.M., Maron G., Mazziotta M.N., Miozzi S., Nania R., Noferini F., Nozzoli F., Palmonari F., Panareo M., Panetta M.P., Paoletti R., Park W., Pellegrino C., Perasso L., Pilo F., Piragino G., Pisano S., Riggi F., Righini G.C., Ripoli C., Rizzi M., Sartorelli G., Scapparone E., Schioppa M., Scribano A., Selvi M., Serci S., Squarcia S., Taiuti M., Terreni G., Trifiro A., Vistoli M.C., Votano L., Williams M.C.S., Zheng L., Zichichi A., Zuyeuski R., Trimarchi, M., Abbrescia, M., Avanzini, C., Baldini, L., Ferroli, R. Baldini, Batignani, L. G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, D., De Pasquale, S., Fabbri, F., Frolov, V., Galante, L., Galeotti, P., Garbini, M., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., Rocca, P. La, Mandaglio, G., Rodriguez, O. Maragoto, Maron, G., Mazziotta, M. N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M. P., Paoletti, R., Park, W., Pellegrino, C., Perasso, L., Pilo, F., Piragino, G., Pisano, S., Riggi, F., Righini, G. C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Vistoli, M. C., Votano, L., Williams, M. C. S., Zheng, L., Zichichi, A., and Zuyeuski, R.
Subjects: Physics, Nuclear and High Energy Physics, Resistive touchscreen, Muon, Large Hadron Collider, Cosmic ray, Eco gas testing, Multigap resistive plate chambers, Instrumentation, Sulfur hexafluoride, Nuclear physics, chemistry.chemical_compound, chemistry, Stack (abstract data type), Eco gas testing, Multigap resistive plate chambers, Nuclear and High Energy Physics, Instrumentation, Multigap resistive plate chambers, Eco gas testing, Fermi Gamma-ray Space Telescope
Abstract: The Extreme Energy Events (EEE) experiment is a project by Centro Fermi (Museo Storico della Fisica e Centro Studi e Ricerche “Enrico Fermi”) in collaboration with INFN, CERN and MIUR, designed to study cosmic rays via a network of muon telescopes, based on the Multigap Resistive Plate Chambers (MRPC) technology. Due to its wide coverage over the Italian territory (more than 10 ° in latitude and longitude, covering more than 3 x 1 0 5 k m 2 ), the EEE network is the largest MRPC – based system for cosmic rays detection. Each MRPC has 6 gas gaps obtained by a stack of glass plate, spaced 250 μ m each, and is equipped with 24 copper strips. Since its beginning, the EEE MRPCs were filled with a gas mixture of 98% of tetrafluoroethane and 2% of sulfur hexafluoride, but recent restrictions on greenhouse gases have prompted the study of their performance with new gas mixtures. To this aim, extensive tests of tetrafluoropropene and carbon dioxide or sulfur hexafluoride gas mixtures have been carried out.
Published: 2019

233. Performance of the multigap resistive plate chambers of the extreme energy events project

Author: Corrado Cicalo, Rosario Nania, C. Avanzini, L. Fabbri, Luca Baldini, M. Selvi, A. Chiavassa, C. Gustavino, Fabrizio Giulio Luca Pilo, M. Rizzi, M. C. S. Williams, L. Galante, Giancarlo C. Righini, F. Coccetti, A. Scribano, S. De Pasquale, G. Piragino, Antonio Trifiro, G. Maron, Giuseppe Mandaglio, S. Pisano, F. Nozzoli, S. Serci, G. Gemme, M. N. Mazziotta, M. C. Vistoli, S. Grazzi, Antonino Zichichi, Riccardo Paoletti, R. Baldini Ferroli, G. Terreni, I. Gnesi, C. Ripoli, L. Votano, A. Corvaglia, P. La Rocca, Eugenio Scapparone, D. De Gruttola, F. Carnesecchi, E. Coccia, L. Perasso, M. Panareo, W. Park, L. G. Batignani, G. Sartorelli, S. Miozzi, M. Garbini, M. Battaglieri, E. Bossini, F. Palmonari, Despina Hatzifotiadou, Luisa Cifarelli, C. Pellegrino, L. Zheng, Vladimir Frolov, M. Trimarchi, O. Maragoto Rodriguez, S. Boi, M. Taiuti, Marco Schioppa, S. Squarcia, Francesco Noferini, M. P. Panetta, P. Galeotti, M. Abbrescia, R. Zuyeuski, Francesco Riggi, Garbini, M., Abbrescia, M., Avanzini, C., Baldini, L., Baldini Ferroli, R., Batignani, L. G., Battaglieri, M., Boi, S., Bossini, E., Carnesecchi, F., Chiavassa, A., Cicalo, C., Cifarelli, L., Coccetti, F., Coccia, E., Corvaglia, A., De Gruttola, D., De Pasquale, S., Fabbri, L., Frolov, V., Galante, L., Galeotti, P., Gemme, G., Gnesi, I., Grazzi, S., Gustavino, C., Hatzifotiadou, D., La Rocca, P., Mandaglio, G., Maragoto Rodriguez, O., Maron, G., Mazziotta, M. N., Miozzi, S., Nania, R., Noferini, F., Nozzoli, F., Palmonari, F., Panareo, M., Panetta, M. P., Paoletti, R., Pellegrino, C., Park, W., Perasso, L., Pilo, F., Piragino, G., Pisano, S., Riggi, F., Righini, G. C., Ripoli, C., Rizzi, M., Sartorelli, G., Scapparone, E., Schioppa, M., Scribano, A., Selvi, M., Serci, S., Squarcia, S., Taiuti, M., Terreni, G., Trifirò, A., Trimarchi, M., Vistoli, M. C., Votano, L., Williams, M. C. S., Zheng, L., Zichichi, A., Zuyeuski, R., Gruttola, D. De, Ferroli, R. Baldini, Batignani, G., Pasquale, S. De, Fabbri, F. L., Rocca, P. La, and Rodriguez, O. Maragoto
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Resistive plate chamber, Performance of High Energy Physics Detector, FOS: Physical sciences, Cosmic ray, Tracking (particle physics), Timing detectors, 01 natural sciences, Cosmic rays, Multi gap resistive plate chambers, Tracking detectors, Nuclear and High Energy Physics, Instrumentation, 030218 nuclear medicine & medical imaging, Tracking detectors, 03 medical and health sciences, 0302 clinical medicine, Muon spectrometer, Particle tracking detectors, 0103 physical sciences, Detectors and Experimental Techniques, Aerospace engineering, physics.ins-det, Cosmic rays, Instrumentation, Mathematical Physics, Performance of High Energy Physics Detectors, Resistive-plate chambers, Physics, Resistive touchscreen, 010308 nuclear & particles physics, business.industry, Tracking detectors, Cosmic rays, Multi gap resistive plate chambers, Detector, Time resolution, Instrumentation and Detectors (physics.ins-det), Particle tracking detector, Multi gap resistive plate chambers, Global Positioning System, business, Energy (signal processing)
Abstract: The muon telescopes of the Extreme Energy Events (EEE) Project are made of three Multigap Resistive Plate Chambers (MRPC). The EEE array is composed, so far, of 59 telescopes and is organized in clusters and single telescope stations distributed all over the Italian territory. They are installed in High Schools with the aim to join research and teaching activities, by involving researchers, teachers and students in the construction, maintenance, data taking and data analysis. The unconventional working sites, mainly school buildings with non-controlled environmental parameters and heterogeneous maintenance conditions, are a unique test field for checking the robustness, the low-ageing features and the long-lasting performance of the MRPC technology for particle tracking and timing purposes. The measurements performed with the EEE array require excellent performance in terms of time and spatial resolution, efficiency, tracking capability and stability. The data from two recent coordinated data taking periods, named Run 2 and Run 3, have been used to measure these quantities and the results are described, together with a comparison with expectations and with the results from a beam test performed in 2006 at CERN., 6 pages, 4 figures, conference RPC 2018
Published: 2019

234. Study of J/ψ and ψ(3686) decays to π+π−η′

Author: A. G. Denig, C. L. Luo, C. C. Zhang, B. Zhong, L. B. Guo, Jin Li, R. Kliemt, P. L. Li, J. Pellegrino, M. Maggiora, J. Zhu, H. Muramatsu, Ulrich Wiedner, Ling Zhao, Kai Liu, Z. X. Meng, X. A. Xiong, Lei Zhao, Z. L. Hou, T. Ma, Jie Yu, Klaus Peters, S. J. Chen, Z. H. Wang, M. G. Zhao, R. P. Guo, Y. H. Xie, W. G. Li, Y. H. Zheng, Cong-Feng Qiao, T. J. Min, K. J. Zhu, Y. K. Sun, J. C. Li, L. Zhang, Y. Nefedov, M. Richter, Z. Ning, P. Musiol, C. F. Redmer, C. Schnier, Bibo Ke, W. B. Yan, Q. P. Ji, Y. Ding, G. Cibinetto, Yunlong Zhang, G. Felici, S. Spataro, X. P. Xu, J. Zhuang, X. T. Huang, A. A. Zafar, G. Rong, V. Prasad, S. Han, L. H. Wu, M. Savrie, Yi Jin, L. Xia, Y. J. Xiao, N. Yu. Muchnoi, X. S. Kang, Y. Y. Liu, H. J. Lu, J. G. Lu, M. X. Luo, Yaquan Fang, D. Y. Liu, J. B. Jiao, B. J. Liu, J. M. Bian, S. J. Zhao, M. H. Gu, Y. H. Zhang, M. N. Achasov, D. Bettoni, C. Z. Yuan, D. V. Dedovich, S. Pacetti, Lei Li, H. M. Liu, J. L. Zhang, R. Poling, Cui Li, M. Kuhlmann, H. Y. Sheng, S. Q. Zhang, Y. X. Xia, S. H. Zhu, Q. J. Xu, X. L. Ji, G. A. Chelkov, W. Kühn, Jianping Zheng, S. L. Niu, C. X. Yu, G. F. Cao, P. L. Wang, F. De Mori, Ke Wang, Z. Y. You, S. Zhu, R. Farinelli, Z. Y. Wang, J. C. Chen, H. J. Li, F. E. Maas, Z. A. Zhu, Talib Hussain, F. Y. Li, Bingxuan Liu, X. Q. Li, Y. F. Long, M. Greco, Ke Li, A. Q. Guo, Nasser Kalantar-Nayestanaki, B. Zheng, R. G. Ping, A. Calcaterra, Z. G. Zhao, S. Fegan, Guangshun Huang, C. Morales Morales, Q. L. Xiu, Z. T. Sun, Z. A. Liu, H. L. Ma, T. Hu, S. Gu, X. Y. Zhou, F. Feldbauer, G. Li, L. Yan, D. M. Li, P. F. Duan, Z. G. Wang, H. H. Zhang, H. Y. Zhang, Z. J. Sun, C. P. Shen, M. Destefanis, Y. Ban, P. Weidenkaff, F. H. Heinsius, K. Schoenning, Q. Y. Li, B. S. Zou, G. R. Liao, L. J. Wu, A. Yuncu, X. K. Zhou, X. L. Luo, H. Leithoff, K. Y. Liu, Z. B. Li, W. Ikegami Andersson, G. Y. Tang, S. Qian, Jialun Ping, Jie Zhao, K. Zhang, G. F. Chen, X. Y. Zhang, C. D. Fu, Z. J. Xiao, Gianfranco Morello, Fenfen An, L. Zotti, S. P. Wen, M. Pelizaeus, X. S. Qin, F. Li, Y. G. Xie, C. Hu, Y. J. Mo, X. F. Wang, F. C. Ma, Niklaus Berger, G. Mezzadri, W. P. Wang, Y. B. Liu, Fang Liu, Q. M. Ma, O. Bakina, I. Denysenko, B. L. Wang, J. Y. Zhang, Y. F. Wang, D. X. Lin, B. Q. Wang, W. C. Yan, H. M. Hu, M. Lara, Z. H. Qin, J. B. Liu, X. R. Zhou, C. Q. Feng, A. Mustafa, X. R. Chen, Cheng Li, Z. Y. Deng, S. Ahmed, X. Tang, Y. X. Yang, Y. J. Sun, E. Boger, F. Bianchi, X. Q. He, S. X. Du, X. Y. Niu, Y. P. Lu, Z. L. Dou, B. Y. Zhang, X. Y. Ma, W. X. Gong, Jia-Jia Qin, J. W. Zhang, T. C. Zhao, Y. Yuan, Y. S. Zhu, Yu Zhang, Y. K. Heng, Xingguo Li, Xiaozhong Huang, M. Rolo, H. S. Chen, T. Weber, J. F. Qiu, Q. Liu, X. K. Chu, P. X. Shen, M. Y. Dong, J. Z. Bai, F. A. Harris, Q. Zhao, Y. Z. Sun, L. Koch, M. Kuemmel, X. H. Sun, M. Tiemens, Z. Wu, X. D. Ruan, L. L. Ma, L. Gong, L. Fava, A. Amoroso, J. H. Zou, I. Uman, Andrzej Kupsc, Xiang Zhou, Zhiqing Liu, M. L. Chen, Liqing Xu, X. Y. Shen, A. Khoukaz, Gang Zhao, L. P. Zhou, Y. M. Ma, R. Baldini Ferroli, P. Kiese, S. L. Olsen, R. A. Briere, Zhiqing Zhang, P. Larin, T. Johansson, J. F. Chang, S. S. Sun, X. Liu, H. R. Qi, Q. Ouyang, T. Holtmann, X. B. Ji, A. Dbeyssi, M. Kornicer, K. J. Li, S. S. Fang, Xiao-Rui Lyu, Y. G. Gao, G. S. Varner, X. S. Jiang, A. Julin, J. Y. Liu, Serkant Ali Cetin, R. E. Mitchell, X. L. Gao, P. Patteri, Z. P. Mao, Q. A. Malik, Dan Wang, Peilian Liu, X. N. Li, O. B. Kolcu, X. Cai, L. Lavezzi, J. F. Sun, Y. J. Mao, H. X. Yang, I. Garzia, C. Dong, C. Leng, O. Cakir, S. Sosio, Q. Gao, Y. N. Gao, Zhiyong Zhang, Haiping Peng, X. C. Lou, X. Q. Hao, Magnus Wolke, Huihui Liu, J. P. Liu, S. Marcello, Y. Zeng, Y. F. Liang, D. P. Jin, J. Fang, Tao Li, Joachim Pettersson, J. Q. Zhang, J. G. Messchendorp, B. X. Yu, Zhi Zeng, J. P. Dai, Dayong Wang, N. Qin, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, Y. H. Yang, Qiunan Xu, J. J. Song, Z. Gao, L. Sun, X. H. Mo, L. S. Wang, H. L. Dai, Igor Boyko, Ch. Rosner, M. H. Ye, H. Liang, I. B. Nikolaev, L. L. Wang, H. Cai, Ke Liu, J. H. Yin, K. H. Rashid, M. Shao, Y. T. Gu, E. Fioravanti, H. B. Liu, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, L. D. Liu, L. Y. Dong, W. J. Zheng, F. Nerling, X. N. Ma, Y. T. Liang, M. Fritsch, M. Kavatsyuk, O. Dorjkhaidav, B. X. Zhang, M. Bertani, L. Yang, J. J. Xu, Yao Wang, T. Khan, J. S. Huang, X. Fang, Z. L. Huang, Feng Liu, C. X. Liu, M. Ablikim, W. Gradl, M. Ripka, D. Y. Wang, J. Min, B. Kopf, K. L. He, Jun-Yi Zhang, Y. P. Guo, Z. P. Zhang, M. Z. Wang, Jimin Zhao, D. W. Bennett, Zujian Wang, Y. Bai, M. Qi, G. F. Xu, H. J. Yang, S. Jin, C. Sowa, Y. B. Zhao, W. Shan, J. Dong, S. B. Liu, Y. Q. Wang, S. Nisar, C. J. Tang, Y. Hu, X. Y. Song, D. Xiao, X. Y. Jiang, M. M. Ma, Zahra Haddadi, Y. Pan, J. Chai, G. X. Sun, J. V. Bennett, K. Goetzen, Z. Jiao, Fu-Hu Liu, D. H. Zhang, Y. Zhang, Q. An, Y. X. Zhou, A. Zhemchugov, I. Tapan, Y. H. Yan, J. W. Zhao, Y. C. Zhu, H. Xiao, T. Held, M. Albrecht, W. D. Li, B. T. Tsednee, and H. B. Li
Subjects: Physics, Particle physics, Annihilation, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Partial wave analysis, Analytical chemistry, Sigma, Lambda, 01 natural sciences, 0103 physical sciences, Pi, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: Using the data samples of 1.31 x 10(9) J/psi events and 4.48 x 10(8) psi(3686) events collected with the BESIII detector, partial wave analyses on the decays J/psi and psi(3686) pthornp -> pi(+)pi(-)eta' are performed with a relativistic covariant tensor amplitude approach. The dominant contribution is found to be J/psi and psi(3686) decays to rho eta' In the J/psi decay, the branching fraction B(J/psi -> rho eta') is determined to be (7.90 +/- 0.19(stat) +/- 0.49(sys)) x 10(-5). Two solutions are found in the psi(3686) decay, and the corresponding branching fraction B(psi(3686) -> rho eta') is (1.02 +/- 0.11(stat) +/- 0.24(sys)) x 10(-5) for the case of destructive interference, and (5.69 +/- 1.28(stat) +/- 2.36(sys)) x 10(-6) for constructive interference. As a consequence, the ratios of branching fractions between psi(3686) and J/psi decays to rho eta' are calculated to be (12.9 +/- 1.4(stat) +/- 3.1(sys))% and (7.2 +/- 1.6(stat) +/- 3.0(sys))%, respectively. We also determine the inclusive branching fractions of J/psi and psi(3686) decays to pi(+)pi(-)eta' to be (1.36 +/- 0.02(stat) +/- 0.08(sys)) x 10(-4) and (1.51 +/- 0.14(stat)) +/- 0.23(sys)) x 10(-5), respectively.
Published: 2017

235. Observation of the helicity-selection-rule suppressed decay of the χc2 charmonium state

Author: Y. Ding, H. R. Qi, X. N. Ma, B. J. Liu, I. Tapan, P. L. Wang, Y. P. Guo, Y. H. Yan, Q. Liu, Tristan Weber, Serkant Ali Cetin, J. Min, M. Savri, L. L. Ma, J. W. Zhao, L. Gong, L. G. Xia, A. Amoroso, B. Wang, M. Fritsch, Z. Y. You, Z. A. Zhu, F. A. Harris, Z. P. Zhang, H. Leithoff, Manuel Lara, H. B. Liu, Jie Zhao, D. X. Lin, X. L. Ji, Y. C. Zhu, C. Leng, M. Kavatsyuk, Y. J. Mao, H. X. Yang, Alexey Zhemchugov, H. M. Hu, I. Garzia, Ke Wang, H. Liang, Q. P. Ji, F. H. Liu, Nicolas Berger, C. P. Shen, H. Xiao, Z. Y. Zhang, A. Dbeyssi, R. Farinelli, H. L. Ma, B. Kopf, K. L. He, B. X. Zhang, Y. H. Guan, S. B. Liu, Y. Nefedov, J. W. Zhang, I. B. Nikolaev, J. H. Yin, M. Kornicer, D. M. Li, Zhiqing Liu, T. Held, H. Muramatsu, S. W. Han, L. H. Wu, A. Julin, Q. Ouyang, F. De Mori, R. Poling, P. F. Duan, F. H. Heinsius, W. Khn, Y. G. Xie, M. Shao, Y. T. Gu, P. Kiese, J. F. Sun, Fenfen An, Jimin Zhao, J. P. Liu, X. Y. Zhou, S. S. Fang, J. F. Chang, B. L. Wang, Z. L. Dou, L. J. Wu, S. Marcello, Y. Zeng, R. A. Briere, Zhe Sun, X. Q. Hao, F. Li, Y. F. Wang, E. H. Thorndike, F. C. Ma, S. Qian, Q. An, Jialun Ping, Jiaxi Liu, L. D. Liu, D. J. Ambrose, X. S. Jiang, E. Fioravanti, J. G. Messchendorp, Y. B. Liu, C. F. Redmer, T. C. Zhao, O. B. Kolcu, K. Zhang, Y. J. Mo, X. H. Liu, L. Q. Qin, M. Bertani, X. Cai, Xiao-Rui Lyu, P. Larin, Yao Wang, X. Y. Zhang, Q. A. Malik, G. Mezzadri, W. C. Yan, Qiunan Xu, Y. B. Zhao, H. B. Li, B. Kloss, C. L. Luo, Z. Haddadi, X. F. Wang, J. P. Dai, M. Pelizaeus, W. Shan, Q. M. Ma, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, Q. W. Zhao, L. Yang, O. Cakir, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, G. S. Varner, S. Z. Chen, J. Q. Zhang, J. B. Liu, X. C. Chen, J. J. Xu, Z. H. Wang, M. N. Achasov, X. L. Gao, L. P. Zhou, R. Baldini Ferroli, X. Y. Niu, Y. Yuan, Y. S. Zhu, M. Albrecht, Y. J. Sun, E. Boger, C. C. Zhang, B. Zhong, L. B. Guo, Y. M. Ma, S. Ahmed, Y. X. Yang, Magnus Wolke, J. F. Qiu, W. G. Li, A. G. Denig, P. Musiol, Z. Ning, Xiaocong Ai, Z. P. Mao, J. Dong, Y. F. Liang, X. Fang, J. S. Huang, C. Schnier, Y. Q. Wang, W. D. Li, Krisztian Peters, Yu Zhang, Y. P. Lu, X. L. Luo, M. Z. Wang, M. H. Ye, Lei Li, T. Hussain, F. Feldbauer, X. Y. Ma, J. Fang, Tao Li, L. Fava, D. P. Jin, Z. L. Huang, Feng Liu, C. X. Liu, S. Spataro, X. T. Huang, S. Q. Zhang, Bibo Ke, W. Gradl, W. X. Gong, G. Rong, M. Ablikim, H. J. Lu, J. G. Lu, Y. Y. Liu, Cui Li, X. N. Li, I. R. Boyko, X. Y. Jiang, D. Y. Wang, C. Dong, Ch. Rosner, X. K. Zhou, A. Hafner, Q. Zhao, Haiping Peng, F. Nerling, J. B. Jiao, W. B. Yan, Y. Z. Sun, S. Sosio, S. Nisar, L. Y. Dong, C. J. Tang, Y. Hu, T. Ma, Liqing Xu, X. Y. Shen, A. A. Zafar, Yaquan Fang, M. Greco, X. H. Sun, M. Qi, H. H. Liu, Walter Ikegami Andersson, H. M. Liu, Y. X. Xia, H. J. Yang, N. Qin, K. Goetzen, Shou-hua Zhu, W. P. Wang, W. J. Zheng, F. Bianchi, F. E. Maas, J. C. Li, Y. H. Zheng, Tao Luo, Z. Gao, S. L. Niu, K. H. Rashid, Cong-Feng Qiao, O. Albayrak, G. F. Cao, Gang Zhao, I. Uman, X. Q. Li, Y. F. Long, T. Hu, J. Zhuang, N. Yu. Muchnoi, X. S. Kang, B. X. Yu, Zhi Zeng, M. X. Luo, Q. Y. Li, B. S. Zou, Y. T. Liang, Joachim Pettersson, Y. N. Guo, S. J. Chen, Y. H. Zhang, A. Q. Guo, L. Zotti, T. Holtmann, X. L. Li, D. V. Dedovich, O. Bakina, S. L. Olsen, K. J. Li, D. Xiao, W. M. Song, Z. Y. Wang, J. Y. Liu, Yunlong Zhang, F. Y. Li, H. S. Chen, Alperen Yuncu, Z. J. Xiao, X. H. Mo, Jin Li, D. Bettoni, H. L. Dai, K. Y. Liu, L. S. Wang, Z. B. Li, J. L. Zhang, S. Pacetti, Tord Johansson, Jianping Zheng, Z. H. Qin, S. Zhu, D. Y. Liu, Q. Gao, G. F. Xu, S. Jin, Y. N. Gao, L. L. Wang, H. Cai, Y. Zhang, G. S. Huang, P. X. Shen, Z. Wu, L. W. Jiang, S. X. Du, Xiaozhong Huang, J. Z. Fan, A. Calcaterra, Z. G. Zhao, Zhiqing Zhang, Jun-Yi Zhang, J. J. Zhang, M. Destefanis, X. Y. Song, H. H. Zhang, Z. J. Sun, H. Loehner, Andrzej Kupsc, C. Hu, X. Tang, Dan Wang, M. L. Chen, G. Felici, K. J. Zhu, D. W. Bennett, G. R. Liao, Zujian Wang, M. Y. Dong, H. J. Li, Q. L. Xiu, J. H. Zou, M. M. Ma, S. S. Sun, R. E. Mitchell, Fang Liu, U. Wiedner, I. Denysenko, J. Chai, G. X. Sun, J. V. Bennett, Li Yan, B. Y. Zhang, Z. Jiao, D. H. Zhang, J. Z. Bai, X. P. Xu, X. B. Ji, M. Tiemens, Y. H. Xie, M. Maggiora, Ling Zhao, Lei Zhao, Z. L. Hou, X. K. Chu, Z. G. Wang, H. Y. Zhang, P. Patteri, G. F. Chen, C. Z. Yuan, J. Y. Zhang, Peilian Liu, Lingxuan Zhang, Y. K. Heng, G. A. Chelkov, Karin Schönning, G. Li, Xichao Ruan, Yang Li, C. D. Fu, C. Q. Feng, X. R. Chen, M. G. Zhao, R. P. Guo, M. H. Gu, Z. Y. Deng, M. Ripka, H. Y. Sheng, Y. N. Zhang, J. M. Bian, S. J. Zhao, Q. J. Xu, C. X. Yu, J. C. Chen, Xuanhong Lou, Nasser Kalantar-Nayestanaki, C. Morales Morales, Yue Pan, R. Kliemt, Jie Yu, T. J. Min, B. Zheng, R. G. Ping, G. Cibinetto, Z. A. Liu, V. Prasad, Y. Ban, P. Weidenkaff, S. P. Wen, X. S. Qin, X. R. Zhou, and Cheng Li
Subjects: Physics, Particle physics, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, 01 natural sciences, Helicity, Pseudoscalar meson, Nuclear magnetic resonance, Isospin, 0103 physical sciences, Pi, Intermediate state, Vector meson, 010306 general physics
Abstract: The decays of chi(c2) -> K+K- pi(0), KSK +/-pi(-/+), and pi(+)pi(-)pi(0) are studied with the psi(3686) data samples collected with the Beijing Spectrometer ( BESIII). For the first time, the br ...
Published: 2017

236. Improved measurements of two-photon widths of the χcJ states and helicity analysis for χc2→γγ

Author: X. Y. Zhou, M. Bertani, L. J. Wu, L. Yang, Y. J. Mo, X. F. Wang, A. Yuncu, K. Goetzen, X. K. Zhou, D. Liu, Q. M. Ma, A. Mustafa, W. B. Yan, W. Gradl, M. Ripka, D. Bettoni, X. Y. Niu, C. Sowa, J. L. Zhang, Y. Yuan, Y. S. Zhu, I. Uman, T. Weber, D. Y. Wang, Yu Zhang, M. Kuemmel, W. Shan, S. Zhu, Q. P. Ji, Y. Q. Wang, M. L. Chen, S. Nisar, C. J. Tang, Y. Hu, Liqing Xu, G. Chelkov, P. L. Li, M. H. Gu, Y. P. Lu, L. Yan, Y. J. Mao, P. Larin, H. X. Yang, K. J. Zhu, X. Y. Shen, I. Garzia, D. Xiao, L. Koch, C. Leng, Kai Liu, M. Destefanis, M. Qi, A. Khoukaz, H. J. Yang, Z. G. Zhao, W. P. Wang, Q. Liu, X. D. Ruan, L. L. Ma, L. Gong, G. S. Huang, A. Amoroso, L. Zhang, Y. J. Sun, A. Dbeyssi, G. F. Xu, M. Kornicer, Y. Pan, R. Baldini Ferroli, A. Julin, S. Jin, R. Kliemt, J. B. Jiao, Huihui Liu, J. P. Liu, M. Albrecht, X. Y. Jiang, Dan Wang, H. Y. Sheng, S. B. Liu, Y. K. Heng, J. Q. Zhang, Y. Nefedov, M. M. Ma, Bibo Ke, C. Hu, X. Tang, Y. Ding, X. L. Gao, J. G. Messchendorp, W. D. Li, M. N. Achasov, B. J. Liu, Zahra Haddadi, C. X. Yu, V. Prasad, Y. X. Xia, S. H. Zhu, B. T. Tsednee, X. N. Ma, Zhenan Liu, Y. T. Liang, X. Y. Song, M. Rolo, Y. T. Zhang, J. P. Dai, S. Q. Zhang, Y. H. Zhang, S. Pacetti, Q. Ouyang, J. C. Li, Jie Yu, Talib Hussain, J. F. Sun, H. J. Lu, Cui Li, Q. An, B. Zheng, R. G. Ping, Qiunan Xu, J. J. Xu, Y. X. Zhou, X. S. Jiang, L. S. Wang, J. Chai, W. Kühn, G. X. Sun, J. V. Bennett, Ming Shao, X. R. Zhou, Z. Y. You, Z. A. Zhu, S. Marcello, F. E. Maas, M. Fritsch, D. P. Jin, I. Tapan, J. Pellegrino, Y. Zeng, X. K. Chu, W. G. Li, J. S. Huang, M. X. Luo, C. X. Liu, D. V. Dedovich, Ke Li, S. Han, Y. H. Yan, Sen Qian, S. Gu, O. Bakina, M. Kavatsyuk, Z. Jiao, Fu-Hu Liu, D. H. Zhang, L. L. Wang, H. Cai, G. F. Chen, G. Y. Tang, H. L. Dai, M. Maggiora, J. Zhu, Ling Zhao, R. Poling, P. F. Duan, J. Y. Zhang, M. H. Ye, Q. A. Malik, S. Spataro, X. P. Xu, Gianfranco Morello, L. Zhou, Y. Y. Liu, P. X. Shen, Jie Zhao, D. X. Lin, C. Dong, H. M. Hu, J. B. Liu, A. Zhemchugov, S. Sosio, Fenfen An, B. L. Wang, C. P. Shen, Fang Liu, O. Dorjkhaidav, B. Kopf, B. Y. Zhang, I. Denysenko, Xiaozhong Huang, Jun-Yi Zhang, Y. P. Guo, K. L. He, S. X. Du, Xiaofeng Zhu, J. Z. Zhang, Y. H. Yang, T. J. Min, T. C. Zhao, Z. P. Zhang, L. D. Liu, B. X. Zhang, Zhiqing Zhang, L. H. Wu, H. Xiao, Lei Zhao, Z. L. Hou, J. J. Song, G. Cibinetto, Z. L. Dou, L. Sun, X. Liu, H. R. Qi, Lei Li, Y. K. Sun, H. M. Liu, L. Y. Dong, Joachim Pettersson, Yunpeng Lu, Z. Gao, M. Z. Wang, Zhiyong Zhang, T. Held, G. Felici, K. J. Li, Z. H. Qin, J. Min, D. W. Bennett, Z. G. Wang, Xiao-Rui Lyu, W. J. Zheng, Z. Wu, Y. Bai, Serkant Ali Cetin, F. Nerling, M. Savrie, A. Calcaterra, Yi Jin, S. Fegan, Z. T. Sun, E. Boger, G. F. Cao, H. Y. Zhang, I. B. Nikolaev, Y. G. Gao, C. Z. Yuan, M. Kuhlmann, H. H. Zhang, J. P. Zheng, H. B. Liu, Y. Ban, P. Weidenkaff, F. H. Heinsius, Yao Wang, Jialun Ping, J. H. Zou, T. Khan, J. H. Yin, K. H. Rashid, K. Zhang, G. S. Varner, Y. T. Gu, Jin Li, B. X. Yu, X. Y. Zhang, H. B. Li, X. Cai, J. G. Lu, A. G. Denig, C. L. Luo, S. P. Wen, G. R. Liao, S. S. Sun, Y. J. Xiao, A. Q. Guo, H. S. Chen, C. C. Zhang, M. Lara, B. Zhong, L. B. Guo, Bingxuan Liu, X. S. Qin, B. Q. Wang, E. Fioravanti, Igor Boyko, H. Muramatsu, G. Li, Ulrich Wiedner, S. L. Niu, M. Y. Dong, J. Zhuang, T. Ma, X. C. Lou, O. B. Kolcu, R. E. Mitchell, C. Q. Feng, T. Hu, Y. B. Chen, Z. L. Huang, Feng Liu, Jia-Jia Qin, C. D. Fu, X. L. Kang, L. Xia, D. H. Wei, P. R. Li, M. Ablikim, J. S. Lange, X. R. Chen, Z. Y. Deng, X. H. Mo, Xingguo Li, Y. C. Zhu, M. G. Zhao, J. Z. Bai, R. P. Guo, Y. H. Xie, Andrzej Kupsc, X. B. Ji, M. Tiemens, P. Patteri, P. Musiol, C. F. Redmer, Y. G. Xie, J. M. Bian, C. Schnier, X. T. Huang, A. A. Zafar, S. J. Zhao, G. Rong, Z. X. Meng, X. A. Xiong, Q. J. Xu, J. C. Chen, W. X. Gong, Zhiqing Liu, Nasser Kalantar-Nayestanaki, C. Morales Morales, S. J. Chen, T. Johansson, F. C. Ma, Y. B. Zhao, Z. H. Wang, J. F. Qiu, L. Fava, S. Ahmed, Y. X. Yang, H. J. Li, Q. Zhao, Y. Z. Sun, J. Fang, Xiang Zhou, L. Lavezzi, X. L. Luo, Z. Zeng, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, Gang Zhao, T. Holtmann, X. Q. Hao, M. Ye, M. Richter, Y. F. Wang, H. P. Peng, P. L. Wang, J. Y. Liu, K. Y. Liu, Z. B. Li, Jing Dong, W. Ikegami Andersson, Q. Gao, Y. N. Gao, Y. Zhang, P. Kiese, S. L. Olsen, R. A. Briere, J. Z. Fan, X. Fang, Z. J. Xiao, P. L. Liu, H. Liang, L. Zotti, X. L. Ji, F. Bianchi, O. Cakir, X. Y. Ma, R. Farinelli, H. Leithoff, F. A. Harris, Q. L. Xiu, J. Z. Zhao, H. L. Ma, D. M. Li, M. Pelizaeus, J. W. Zhang, A. Sarantsev, X. H. Sun, Z. Wang, J. F. Chang, Magnus Wolke, Y. F. Liang, S. S. Fang, Dayong Wang, N. Qin, Y. B. Liu, Y. H. Zheng, Cong-Feng Qiao, N. Yu. Muchnoi, X. S. Kang, Z. Y. Wang, F. Feldbauer, Ke Wang, Ke Liu, X. N. Li, Yaquan Fang, K. Peters, J. W. Zhao, K. Schoenning, Q. Y. Li, B. S. Zou, Niklaus Berger, G. Mezzadri, F. Li, Cheng Li, X. Q. He, W. C. Yan, Y. M. Ma, Z. P. Mao, Tao Li, Z. J. Sun, Ch. Rosner, Zhe Ning, and F. De Mori
Subjects: Physics, Annihilation, 010308 nuclear & particles physics, 0103 physical sciences, Analytical chemistry, 010306 general physics, 01 natural sciences, Helicity, Gamma gamma
Abstract: Based on 448.1 x 10(6) Psi(3686) events collected with the BESIII detector, the decays Psi(3686) -> gamma chi(cJ), chi(cJ) -> gamma gamma(J = 0, 1, 2) are studied. The decay branching fractions of chi(c0,2) -> gamma gamma are measured to be B(chi(c0) -> gamma gamma) = (1.93 +/- 0.08 +/- 0.05 +/- 0.05) x 10(-4) and B(chi(c2) -> gamma gamma) = (3.10 +/- 0.09 +/- 0.07 +/- 0.11) x 10(-4) which correspond to two-photon decay widths of Gamma(gamma gamma)(chi(c0)) = 2.03 +/- 0.08 +/- 0.06 +/- 0.13 keV and Gamma(gamma gamma)(chi(c2)) = 0.60 +/- 0.02 +/- 0.01 +/- 0.04 keV with a ratio of R = Gamma(gamma gamma)(chi(c2))/Gamma(gamma gamma)(chi(c0)) = 0.295 +/- 0.014 +/- 0.007 +/- 0.027, where the uncertainties are statistical, systematic and associated with the uncertainties of B(Psi(3686) -> gamma chi(c0,2)) and the total widths Gamma(chi(c0,2)), respectively. For the forbidden decay of chi(c1) -> gamma gamma, no signal is observed, and an upper limit on the two-photon width is obtained to be Gamma(gamma gamma)(chi(c1)) gamma gamma is also measured to be f(0/2) = Gamma(lambda=0)(gamma gamma) (chi(c2))/Gamma(lambda=2)(gamma gamma) (chi(c2)) = (0.0 +/- 0.6 +/- 1.2) x 10(-2), where the uncertainties are statistical and systematic, respectively.
Published: 2017

237. Measurement of branching fractions for ψ(3686)→γη′ , γη , and γπ0

Author: A. Calcaterra, A. Q. Guo, G. Rong, R. Farinelli, H. L. Ma, R. Kliemt, D. M. Li, Zongyuan Wang, H. Muramatsu, X. Liu, M. Kuemmel, C. Leng, W. P. Wang, X. L. Ji, C. Sowa, A. Guskov, Y. B. Zhao, M. Pelizaeus, J. Libby, H. R. Qi, W. Shan, Z. H. Qin, L. J. Wu, J. Dong, Y. Q. Wang, Yaquan Fang, L. Koch, A. Khoukaz, Talib Hussain, S. Nisar, C. J. Tang, Y. Hu, X. Y. Shan, Jie Yu, J. Pellegrino, Y. P. Lu, Kai Liu, Z. A. Liu, Guo-Ming Chen, A. Pitka, Q. Ouyang, S. S. Fang, J. Zhu, Ling Zhao, W. M. Song, D. Xiao, Serkant Ali Cetin, Y. J. Mo, Jun-Yi Zhang, Yanwei Wang, Y. P. Guo, L. Zhang, Y. Nefedov, Z. G. Wang, M. H. Ye, Z. P. Zhang, Y. B. Liu, H. B. Li, X. Y. Jiang, M. M. Ma, J. C. Chen, Zahra Haddadi, Y. Pan, J. Chai, G. X. Sun, Z. Jiao, Fu-Hu Liu, D. H. Zhang, K. J. Zhu, D. Y. Liu, Dan Wang, R. Baldini Ferroli, D. W. Bennett, Zujian Wang, X. K. Zhou, Fang Liu, I. Denysenko, T. Holtmann, J. Y. Liu, C. L. Luo, A. Yuncu, Y. G. Xie, Zhiyong Zhang, K. Schoenning, Q. Y. Li, B. S. Zou, Niklaus Berger, Lei Zhao, Z. L. Hou, Y. J. Mao, H. X. Yang, I. Garzia, H. Y. Zhang, Haiwen Liu, Y. Bai, J. B. Jiao, Huanhuan Liu, G. Felici, W. C. Yan, J. Z. Bai, C. C. Zhang, Yuekun Heng, H. S. Chen, H. J. Lu, J. G. Lu, B. Zhong, H. Liang, I. B. Nikolaev, B. Garillon, Huihui Liu, S. X. Du, X. N. Li, J. Y. Zhang, Shun-Jia Huang, S. Q. Zhang, Z. L. Dou, B. Y. Zhang, J. F. Sun, F. Li, J. Q. Zhang, S. L. Niu, F. Y. Li, S. Marcello, Y. Zeng, Haiping Peng, F. E. Maas, T. Hu, Ulrich Wiedner, Cui Li, K. Goetzen, F. C. Ma, Q. Gao, Y. N. Gao, J. G. Messchendorp, M. Fritsch, J. H. Wei, L. D. Liu, M. Qi, Jianhao Zhang, A. Zhemchugov, L. Y. Dong, H. J. Li, Q. L. Xiu, Q. P. Ji, T. Ma, H. J. Yang, K. J. Li, Xiao-Rui Lyu, S. Gu, Liqing Xu, O. Bakina, Qiunan Xu, Bingxuan Liu, X. Q. Li, Y. F. Long, C. Z. Yuan, M. Greco, F. Bianchi, M. Kuhlmann, Jin Li, X. Y. Shen, S. Ahmed, Y. X. Yang, Kang Li, M. H. Gu, Y. G. Gao, W. J. Zheng, J. F. Qiu, Ke Liu, S. Qian, Jialun Ping, A. Amoroso, Yao Wang, Bibo Ke, W. B. Yan, W. G. Li, Y. K. Sun, P. L. Li, S. Spataro, X. P. Xu, Z. Y. Deng, K. Zhang, X. Y. Zhang, X. R. Chen, L. Fava, Xiaofeng Zhu, J. Z. Zhang, Y. H. Yang, J. J. Song, L. Sun, G. S. Varner, P. X. Shen, Y. Ding, Z. Wu, Gueorgui Chelkov, B. X. Yu, H. Y. Sheng, S. Pacetti, M. Lara, Q. Zhao, Dmitri Dedovich, Y. Z. Sun, Lei Li, P. L. Wang, B. J. Liu, D. Bettoni, Y. H. Zheng, F. Nerling, W. D. Li, Q. Liu, Cong-Feng Qiao, Yunlong Zhang, Zhiqing Zhang, K. Y. Liu, G. Mezzadri, Zhi Zeng, Yang Zhang, Xiang Zhou, Gang Zhao, Z. B. Li, W. Ikegami Andersson, H. Cai, X. Q. He, X. L. Luo, Y. J. Sun, B. T. Tsednee, M. G. Zhao, R. P. Guo, Y. H. Xie, J. P. Dai, Z. G. Zhao, S. Fegan, S. Jin, N. Yu. Muchnoi, Yao Zhang, G. Li, M. Ablikim, Sai-Juan Chen, Guangshun Huang, W. Kühn, Z. Y. You, Z. A. Zhu, C. D. Fu, T. Khan, L. Yan, M. Albrecht, Ke Li, C. Q. Feng, G. R. Liao, C. X. Yu, L. P. Zhou, X. S. Kang, M. Maggiora, J. H. Yin, K. H. Rashid, Y. M. Ma, J. L. Zhang, M. Shao, Y. T. Gu, Y. H. Zhang, J. J. Xu, I. Tapan, T. Weber, H. H. Zhang, Y. H. Yan, B. Q. Wang, S. J. Zhao, M. Y. Dong, Z. P. Mao, Y. F. Wang, L. L. Ma, J. W. Zhao, L. Gong, J. V. Bennett, C. P. Shen, Z. J. Sun, Y. C. Zhu, B. Zheng, R. G. Ping, Z. T. Sun, F. Feldbauer, Jianping Zheng, S. Zhu, M. Tiemens, Y. Zhang, H. B. Liu, J. S. Huang, Z. Y. Wang, J. Fang, Yi Chen, Z. L. Huang, Feng Liu, E. Fioravanti, Z. X. Meng, X. K. Chu, C. X. Liu, X. A. Xiong, Igor Boyko, Q. J. Xu, E. Boger, Z. Gao, X. Y. Ma, J. H. Zou, Xuanhong Lou, W. X. Gong, T. Held, J. C. Li, Xingguo Li, Nasser Kalantar-Nayestanaki, Ch. Rosner, X. Cai, S. B. Liu, G. F. Xu, A. Dbeyssi, S. S. Sun, C. Morales Morales, J. Zhuang, A. Sarantsev, G. F. Cao, D. H. Wei, P. R. Li, Ke Wang, J. S. Lange, A. Denig, M. X. Luo, X. H. Sun, X. S. Qin, X. N. Ma, Y. T. Liang, H. Leithoff, P. Weidenkaff, F. H. Heinsius, Klaus Peters, X. Y. Song, L. Yang, Orhan Cakir, P. Kiese, P. F. Duan, J. B. Liu, S. L. Olsen, R. E. Mitchell, Y. Ban, Gianfranco Morello, M. L. Chen, S. P. Wen, B. L. Wang, M. Kavatsyuk, T. C. Zhao, M. N. Achasov, X. S. Jiang, X. R. Zhou, O. Dorjkhaidav, Cheng Li, X. L. Gao, B. X. Zhang, M. Kornicer, M. Destefanis, Y. T. Tan, Q. A. Malik, X. B. Ji, W. Gradl, R. A. Briere, A. Julin, C. Dong, P. Patteri, S. Sosio, M. Ripka, X. H. Mo, L. S. Wang, F. De Mori, D. Y. Wang, Joachim Pettersson, J. Min, X. Y. Zhou, C. F. Redmer, B. Kopf, J. F. Hu, X. Tang, K. L. He, L. L. Wang, C. Schnier, R. Poling, M. Rolo, M. Z. Wang, Jimin Zhao, F. Cossio, X. T. Huang, Yu Zhang, A. A. Zafar, X. F. Wang, Q. M. Ma, V. Prasad, S. Han, A. Mustafa, X. Y. Niu, L. H. Wu, Y. Yuan, Y. S. Zhu, M. Bertani, M. Savrie, Yi Jin, L. Xia, Y. J. Xiao, T. Y. Qi, Y. X. Xia, S. H. Zhu, G. Cibinetto, I. Uman, P. Larin, G. Y. Tang, H. L. Dai, X. H. Xie, Jie Zhao, D. X. Lin, H. M. Hu, Q An, M. Alekseev, J. F. Chang, Magnus Wolke, Y. F. Liang, D. P. Jin, F. A. Harris, Zhiqing Liu, T. Johansson, Dayong Wang, N. Qin, O. B. Kolcu, Xiaozhong Huang, L. Lavezzi, X. Q. Hao, M. Richter, Z. Ning, Andrzej Kupsc, Michael Papenbrock, Z. J. Xiao, and F. F. An
Subjects: Physics, Electromagnetic calorimeter, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, High Energy Physics::Experiment, 010306 general physics, Branching (polymer chemistry), 01 natural sciences, Astrophysics::Galaxy Astrophysics
Abstract: Using a data sample of 448 x 10(6) psi(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays psi(3686) -> gamma eta and psi(3686) -> gamma pi(0) are observed with a statistical significance of 7.3 sigma and 6.7 sigma, respectively. The branching fractions are measured to be B(psi(3686) -> gamma eta) = (0.85 +/- 0.18 +/- 0.05) x 10(-6) and B(psi(3686) ->gamma pi(0)) = (0.95 +/- 0.16 +/- 0.05) x 10(-6). In addition, we measure the branching fraction of psi(3686) -> gamma eta' to be B(psi(3686) -> gamma eta') = (125.1 +/- 2.2 +/- 6.2)x10(-6), which represents an improvement of precision over previous results.
Published: 2017

238. Evidence for e+e−→γηc(1S) at center-of-mass energies between 4.01 and 4.60 GeV

Author: Y. F. Wang, J. V. Bennett, X. Y. Ma, W. X. Gong, X. H. Sun, P. Larin, H. J. Lu, J. G. Lu, Yaquan Fang, Kai Liu, M. Kuemmel, F. E. Maas, Orhan Cakir, P. Kiese, S. L. Olsen, X. S. Jiang, R. Farinelli, S. L. Niu, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, X. N. Ma, T. Hu, K. Y. Liu, Z. B. Li, W. Ikegami Andersson, J. F. Chang, L. Zhang, S. Gu, D. Y. Liu, Y. Nefedov, J. B. Jiao, Y. T. Liang, H. L. Ma, D. M. Li, O. Bakina, Magnus Wolke, Yuekun Heng, Y. H. Zheng, K. J. Li, H. Muramatsu, Cong-Feng Qiao, Y. F. Liang, Xiao-Rui Lyu, K. Schoenning, Q. Y. Li, B. S. Zou, D. P. Jin, N. Yu. Muchnoi, X. S. Kang, Y. H. Zhang, Dan Wang, R. Kliemt, Cui Li, Z. Y. Wang, Yi Chen, P. X. Shen, X. K. Chu, Niklaus Berger, M. Pelizaeus, Dayong Wang, N. Qin, Z. Wu, J. Z. Bai, F. Feldbauer, G. Y. Tang, H. L. Dai, X. H. Xie, Gueorgui Chelkov, J. Pellegrino, Michael Papenbrock, Jie Zhao, D. X. Lin, H. M. Hu, J. Zhu, Ling Zhao, S. Q. Zhang, M. Albrecht, W. M. Song, M. Rolo, G. R. Liao, Lei Zhao, Y. G. Gao, Y. Ban, Z. L. Hou, Q An, Zhiqing Zhang, T. Holtmann, M. Fritsch, Q. Ouyang, M. Alekseev, B. Q. Wang, J. Y. Liu, Z. J. Xiao, T. Y. Qi, G. S. Varner, Jie Yu, Y. X. Xia, S. H. Zhu, J. F. Sun, J. Min, M. Kavatsyuk, C. Z. Yuan, H. B. Li, F. F. An, M. Kuhlmann, S. S. Fang, G. Cibinetto, A. Dbeyssi, S. Marcello, Guo-Ming Chen, Y. Zeng, C. L. Luo, M. N. Achasov, Q. Gao, Y. N. Gao, Ke Wang, B. Kopf, Jin Li, Y. Zhang, Xiaofeng Zhu, J. Z. Zhang, Y. H. Yang, J. J. Song, L. Sun, K. L. He, P. L. Li, A. Zhemchugov, Y. B. Liu, C. C. Zhang, O. Dorjkhaidav, X. L. Gao, T. J. Min, K. J. Zhu, M. Z. Wang, B. Zhong, L. B. Guo, M. G. Zhao, Jimin Zhao, S. Ahmed, Y. X. Yang, P. F. Duan, R. P. Guo, Y. H. Xie, Guangshun Huang, Gianfranco Morello, B. X. Zhang, L. Yan, A. Pitka, Q. A. Malik, Ulrich Wiedner, B. L. Wang, M. R. Shepherd, H. Liang, C. Dong, S. Sosio, Q. Zhao, Dmitri Dedovich, Y. Z. Sun, G. Felici, X. L. Ji, Xiang Zhou, T. C. Zhao, I. B. Nikolaev, Xiaozhong Huang, Gang Zhao, T. Ma, M. H. Ye, Andrzej Kupsc, Talib Hussain, Z. Y. Deng, A. Calcaterra, S. Qian, C. Leng, Jialun Ping, A. Amoroso, A. Q. Guo, G. Rong, J. P. Dai, K. Zhang, J. Q. Zhang, Z. G. Zhao, J. M. Bian, S. J. Zhao, Yanwei Wang, X. Y. Zhang, S. Fegan, A. Yuncu, Jianhao Zhang, X. B. Ji, Y. G. Xie, H. J. Li, M. Qi, J. H. Wei, S. X. Du, M. Lara, Ke Liu, H. H. Zhang, B. X. Yu, Z. L. Dou, H. J. Yang, Q. L. Xiu, P. Patteri, Q. J. Xu, X. Y. Jiang, Zhi Zeng, L. D. Liu, Joachim Pettersson, Z. J. Sun, Xuanhong Lou, M. M. Ma, J. C. Chen, H. Cai, Nasser Kalantar-Nayestanaki, L. Y. Dong, C. Morales Morales, Y. J. Sun, Z. G. Wang, F. Bianchi, H. Y. Zhang, Y. P. Lu, M. H. Gu, J. C. Li, Haiwen Liu, S. B. Liu, J. Y. Zhang, Zahra Haddadi, J. Zhuang, H. Y. Sheng, A. Denig, M. X. Luo, Y. Ding, L. Yang, Igor Boyko, M. Y. Dong, J. B. Liu, B. J. Liu, C. X. Yu, M. Tiemens, H. B. Liu, Y. Pan, Yao Wang, D. Bettoni, J. H. Zou, M. Destefanis, X. Cai, S. S. Sun, W. Gradl, W. Kühn, M. Ripka, X. S. Qin, J. Chai, D. Y. Wang, M. L. Chen, G. Mezzadri, Z. Y. You, W. J. Zheng, L. Koch, A. Khoukaz, B. Zheng, R. E. Mitchell, X. Q. He, Yu Zhang, Z. A. Zhu, G. X. Sun, R. G. Ping, Z. T. Sun, F. De Mori, L. P. Zhou, Y. M. Ma, Bingxuan Liu, S. Jin, R. Baldini Ferroli, Z. P. Mao, G. Li, C. P. Shen, M. Ablikim, Sai-Juan Chen, J. Fang, Tao Li, Z. Jiao, Fu-Hu Liu, D. H. Zhang, C. D. Fu, C. Q. Feng, Z. Gao, Ch. Rosner, F. Nerling, P. Weidenkaff, F. H. Heinsius, X. Y. Zhou, T. Khan, Xingguo Li, S. P. Wen, X. R. Zhou, R. Poling, Cheng Li, C. Sowa, Y. B. Zhao, W. Shan, X. N. Li, X. Fang, J. Dong, Peilian Liu, Zhiyong Zhang, X. F. Wang, Haiping Peng, Y. Q. Wang, S. Nisar, Z. L. Huang, Feng Liu, P. L. Wang, Q. M. Ma, C. J. Tang, X. L. Luo, Y. Hu, A. Mustafa, Z. A. Liu, X. H. Mo, L. S. Wang, Yunlong Zhang, D. Xiao, L. L. Wang, J. L. Zhang, Jianping Zheng, S. Zhu, X. Y. Niu, Jun-Yi Zhang, Y. P. Guo, Z. P. Zhang, J. H. Yin, K. H. Rashid, Y. Yuan, M. Shao, Y. T. Gu, Y. S. Zhu, M. Bertani, E. Fioravanti, D. W. Bennett, C. Hu, X. L. Kang, X. Tang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, Zujian Wang, Y. Bai, X. Liu, L. J. Wu, Y. J. Mo, Z. H. Wang, H. R. Qi, H. S. Chen, T. Weber, Shun-Jia Huang, Q. P. Ji, Serkant Ali Cetin, Liqing Xu, X. Y. Shen, C. F. Redmer, C. Schnier, X. K. Zhou, Fang Liu, I. Denysenko, W. C. Yan, X. T. Huang, Q. Liu, K. Goetzen, B. Y. Zhang, A. A. Zafar, L. L. Ma, L. Gong, M. Kornicer, R. A. Briere, A. Julin, Bibo Ke, W. B. Yan, S. Pacetti, G. F. Xu, M. Maggiora, G. F. Cao, Ke Li, X. Y. Song, J. J. Xu, H. Leithoff, J. S. Huang, C. X. Liu, X. R. Chen, W. D. Li, B. T. Tsednee, Zhiqing Liu, T. Johansson, O. B. Kolcu, F. Li, L. Lavezzi, X. Q. Hao, I. Tapan, F. C. Ma, F. A. Harris, Y. H. Yan, M. Richter, Z. Ning, J. W. Zhao, V. Prasad, S. Han, Y. C. Zhu, W. P. Wang, H. Xiao, J. F. Qiu, E. Boger, T. Held, L. Fava, L. H. Wu, Z. H. Qin, M. Savrie, Yi Jin, W. G. Li, Y. K. Sun, L. Xia, Y. J. Xiao, S. Spataro, X. P. Xu, Lei Li, Y. J. Mao, H. X. Yang, I. Garzia, Z. X. Meng, X. A. Xiong, B. Garillon, Huihui Liu, J. G. Messchendorp, Klaus Peters, Qiunan Xu, and I. Uman
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Sigma, 01 natural sciences, Nuclear physics, Cross section (physics), 0103 physical sciences, High Energy Physics::Experiment, Center of mass, Born approximation, Nuclear Experiment, 010306 general physics
Abstract: We present first evidence for the process e(+)e(-) -> gamma eta(c)(1S) at six center-of-mass energies between 4.01 and 4.60 GeV using data collected by the BESIII experiment operating at BEPCII. We measure the Born cross section at each energy using a combination of twelve eta(c)(1S) decay channels. We also combine all six energies under various assumptions for the energy-dependence of the cross section. If the process is assumed to proceed via the Y(4260), we measure a peak Born cross section sigma(peak)(e(+)e(-) -> gamma eta(c)(1S)) = 2.11 +/- 0.49 (stat.) +/- 0.36 (syst.) pb with a statistical significance of 4.2 sigma.
Published: 2017

239. Measurement of e+e−→π+π−ψ(3686) from 4.008 to 4.600 GeV and observation of a charged structure in the π±ψ(3686) mass spectrum

Author: D. J. Ambrose, X. L. Ji, J. F. Sun, J. C. Li, J. Zhuang, M. X. Luo, R. Farinelli, M. Albrecht, G. A. Chelkov, Talib Hussain, K. Goetzen, S. Marcello, Y. Zeng, M. Y. Dong, A. Q. Guo, G. Rong, W. D. Li, X. Fang, H. B. Liu, J. H. Zou, D. V. Dedovich, H. L. Ma, D. M. Li, H. Muramatsu, L. Zotti, I. Uman, W. M. Song, Y. Ding, Y. X. Xia, Yanwei Wang, A. Yuncu, Z. T. Sun, Z. L. Huang, Feng Liu, Y. B. Chen, M. Pelizaeus, Xiaofeng Zhu, J. Z. Zhang, P. L. Wang, S. S. Sun, P. Larin, J. M. Bian, S. J. Zhao, B. J. Liu, M. Ablikim, M. H. Ye, S. Qian, Jialun Ping, K. Zhang, Jie Zhao, D. X. Lin, H. M. Hu, E. H. Thorndike, Y. G. Xie, X. Y. Zhang, V. Prasad, Q. Liu, X. D. Ruan, W. P. Wang, I. Tapan, P. Kiese, Y. Ban, P. Weidenkaff, F. H. Heinsius, C. Leng, T. Holtmann, F. A. Harris, L. Q. Qin, R. E. Mitchell, S. X. Du, Z. L. Dou, L. D. Liu, M. Lara, J. B. Liu, Z. H. Qin, S. P. Wen, Y. J. Sun, E. Boger, L. L. Ma, L. Gong, Y. H. Yan, J. W. Zhao, W. Kühn, S. L. Olsen, R. A. Briere, L. Y. Dong, X. S. Qin, X. R. Zhou, Z. Y. You, Z. A. Zhu, Cheng Li, L. G. Xia, Q. J. Xu, F. Feldbauer, J. C. Chen, X. K. Zhou, Fang Liu, J. Y. Liu, J. P. Dai, Y. H. Guan, S. Jin, Zhiqing Liu, Y. P. Lu, A. Amoroso, Y. C. Zhu, Y. J. Mao, Yao Zhang, G. Li, X. S. Jiang, H. X. Yang, I. Garzia, I. Denysenko, Xuanhong Lou, Nasser Kalantar-Nayestanaki, Guangshun Huang, H. B. Li, X. C. Chen, A. G. Denig, Q. Gao, Y. N. Gao, C. L. Luo, Xiao-Rui Lyu, L. Yan, Kai Liu, W. J. Zheng, X. K. Chu, H. Leithoff, F. Li, T. Johansson, J. F. Chang, A. Dbeyssi, M. Kornicer, C. D. Fu, F. Nerling, G. F. Xu, S. Z. Chen, B. Y. Zhang, C. Morales Morales, C. P. Shen, Q. An, J. Q. Zhang, C. Q. Feng, X. R. Chen, Yao Wang, F. C. Ma, G. S. Varner, O. B. Kolcu, H. Xiao, T. Held, A. Julin, F. De Mori, Z. Y. Deng, Y. Nefedov, O. Cakir, Huihui Liu, J. P. Liu, C. C. Zhang, Y. Guo, J. Z. Fan, A. Zhemchugov, X. Cai, J. H. Yin, K. H. Rashid, Peilian Liu, X. Y. Zhou, Xingguo Li, L. J. Wu, J. G. Messchendorp, S. L. Niu, M. Shao, Y. T. Gu, Lingxuan Zhang, F. Y. Li, Qiunan Xu, X. Y. Song, X. Q. Li, Y. F. Long, S. Ahmed, Y. X. Yang, Zhiyong Zhang, J. Z. Bai, Kang Li, X. Q. Hao, H. J. Lu, J. G. Lu, B. Zhong, L. B. Guo, X. N. Ma, Y. T. Liang, Bibo Ke, X. Liu, H. R. Qi, Z. Ning, J. F. Qiu, Y. J. Mo, E. Fioravanti, M. Greco, W. G. Li, J. J. Xu, W. B. Yan, M. N. Achasov, Giulietto Felici, F. E. Maas, L. Fava, T. Hu, M. Fritsch, S. Pacetti, Serkant Ali Cetin, Cui Li, X. F. Wang, Q. M. Ma, X. L. Kang, A. Sarantsev, Ulrich Wiedner, Q. P. Ji, S. Spataro, T. Weber, Y. H. Zheng, Cong-Feng Qiao, O. Albayrak, N. Yu. Muchnoi, M. H. Gu, Y. B. Li, X. P. Xu, Y. Y. Liu, J. S. Huang, M. Maggiora, M. Kavatsyuk, Klaus Peters, A. Hafner, Q. Zhao, X. B. Ji, M. Tiemens, H. Y. Sheng, Y. Z. Sun, D. H. Wei, J. S. Lange, Q. W. Zhao, T. Ma, O. Bakina, Ke Li, Ling Zhao, D. Y. Liu, J. B. Jiao, C. X. Liu, B. Kloss, X. Y. Niu, Y. Yuan, K. Y. Liu, P. Patteri, Y. S. Zhu, Z. B. Li, W. Ikegami Andersson, Lei Li, X. S. Kang, Y. H. Zhang, Lei Zhao, Xiang Zhou, Z. L. Hou, C. X. Yu, Gang Zhao, Yang Zhang, B. X. Zhang, P. X. Shen, Yuekun Heng, Z. Wu, S. H. Zhu, R. Kliemt, Y. F. Wang, Liqing Xu, X. Y. Shen, Z. Y. Wang, G. F. Cao, Jie Yu, S. J. Chen, B. Zheng, R. G. Ping, L. W. Jiang, X. H. Mo, L. S. Wang, S. Q. Zhang, Zhiqing Zhang, G. R. Liao, X. Y. Ma, W. X. Gong, A. Calcaterra, Z. G. Zhao, T. J. Min, K. J. Zhu, C. Z. Yuan, L. L. Wang, H. Cai, G. Cibinetto, Jun-Yi Zhang, Y. P. Guo, H. H. Zhang, X. H. Sun, Z. J. Sun, H. Loehner, S. Han, Z. P. Zhang, D. W. Bennett, Zujian Wang, L. H. Wu, M. Savrie, X. Y. Jiang, M. M. Ma, P. R. Li, Y. Pan, Z. H. Wang, J. Chai, G. X. Sun, J. V. Bennett, Z. Jiao, Fu-Hu Liu, D. H. Zhang, Y. B. Zhao, W. Shan, J. Dong, Y. Q. Wang, S. Nisar, P. Musiol, C. J. Tang, Y. Hu, C. F. Redmer, Xiaocong Ai, Z. A. Liu, C. Schnier, B. Wang, D. Xiao, X. T. Huang, A. A. Zafar, Xiaozhong Huang, Andrzej Kupsc, M. L. Chen, Magnus Wolke, Y. F. Liang, D. P. Jin, Dayong Wang, N. Qin, Xian Gao, Michael Papenbrock, Z. J. Xiao, Q. A. Malik, C. Dong, S. Sosio, Joachim Pettersson, Yunlong Zhang, D. Bettoni, J. L. Zhang, Jianping Zheng, S. Zhu, J. J. Zhang, M. Destefanis, C. Hu, X. Tang, M. Qi, H. J. Yang, S. B. Liu, J. Min, B. Kopf, K. L. He, M. Z. Wang, Jimin Zhao, X. L. Luo, F. Bianchi, Huanhuan Liu, M. Bertani, Z. Haddadi, L. Yang, H. J. Li, Q. L. Xiu, Zongyuan Wang, Q. Ouyang, S. S. Fang, Y. B. Liu, W. Gradl, M. Ripka, D. Y. Wang, R. Baldini Ferroli, X. N. Li, Haiping Peng, Tao Luo, B. X. Yu, Zhi Zeng, H. Liang, I. B. Nikolaev, H. S. Chen, H. L. Dai, Igor Boyko, J. H. Liu, Ke Wang, Jianhao Zhang, R. Poling, P. F. Duan, Fenfen An, B. L. Wang, Yaquan Fang, T. C. Zhao, K. Schoenning, Q. Y. Li, B. S. Zou, Niklaus Berger, G. Mezzadri, W. C. Yan, Yu Zhang, L. P. Zhou, Y. M. Ma, Z. P. Mao, J. Fang, Tao Li, Z. Gao, Ch. Rosner, Z. G. Wang, H. Y. Zhang, Haiwen Liu, L. Xia, G. F. Chen, J. Y. Zhang, Jin Li, M. G. Zhao, R. P. Guo, Y. H. Xie, and Y. N. Zhang
Subjects: Particle physics, Photon, Meson, Electron–positron annihilation, General Physics and Astronomy, Dalitz plot, 01 natural sciences, Resonance (particle physics), law.invention, Momentum, Nuclear physics, law, 0103 physical sciences, Pi, Intermediate state, Invariant mass, Born approximation, Nuclear Experiment, 010306 general physics, Collider, Quantum chromodynamics, Physics, Luminosity (scattering theory), Linear polarization, 010308 nuclear & particles physics, Sigma, Magnetic field, Antimatter, Isospin, Mass spectrum, High Energy Physics::Experiment, Atomic physics
Abstract: We study the process e(+)e(-) -> p(+)p(-)psi(3686) using 5.1 fb(-1) of data collected at 16 center-of-mass energy (root s) points from 4.008 to 4.600 GeV by the BESIII detector operating at the BEPCII collider. The measured Born cross sections for e(+)e(-) -> p(+)p(-)psi(3686) are consistent with previous results, but with much improved precision. A fit to the cross section shows contributions from two structures: the first has M = 4209.5 +/- 7.4 +/- 1.4 MeV/c(2) and Gamma = 80.1 +/- 24.6 +/- 2.9 MeV, and the second has M = 4383.8 +/- 4.2 +/- 0.8 MeV/c(2) and Gamma = 84.2 +/- 12.5 +/- 2.1 MeV, where the first errors are statistical and the second systematic. The lower-mass resonance is observed in the process e(+)e(-) -> p(+)p(-)psi(3686) for the first time with a statistical significance of 5.8 sigma. A charged charmoniumlike structure is observed in the pi(+/-)psi(3686) invariant mass spectrum for data at root s = 4.416 GeV. A fit with an S-wave Breit-Wigner function yields a mass M = 4032.1 +/- 2.4 MeV/c(2), where the errors are statistical only. However, there are still unresolved discrepancies between the fit model and data. The width of the intermediate state varies in a wide range for different kinematic regions within the data set. Therefore, no simple interpretation of the data has been found, and a future data sample with larger statistics and more theoretical input will be required to better understand this issue.
Published: 2017

240. Determination of the Spin and Parity of the Zc(3900)

Author: H. B. Li, A. G. Denig, C. L. Luo, C. C. Zhang, Guangshun Huang, L. Yan, A. A. Zafar, L. J. Wu, Y. J. Mo, B. Zhong, L. B. Guo, H. Muramatsu, Ulrich Wiedner, M. Kornicer, T. Ma, Y. F. Wang, H. S. Chen, T. Weber, Y. J. Mao, H. X. Yang, I. Garzia, M. Y. Dong, M. Tiemens, X. L. Gao, F. Li, F. C. Ma, K. H. Rashid, Jin Li, T. Hussain, X. Y. Ma, Q. P. Ji, Huihui Liu, H. B. Liu, J. H. Zou, M. Ullrich, Z. J. Xiao, G. Felici, G. A. Chelkov, S. J. Chen, M. G. Zhao, R. P. Guo, W. X. Gong, Liqing Xu, X. Y. Shen, J. P. Liu, J. G. Messchendorp, S. S. Sun, C. Dong, S. Sosio, J. F. Qiu, L. Fava, F. Nerling, Y. H. Guan, Kai Liu, P. L. Wang, F. A. Harris, A. Calcaterra, Z. G. Zhao, H. H. Zhang, Y. Ding, B. J. Liu, J. P. Dai, Qiunan Xu, M. Shi, R. E. Mitchell, Y. N. Zhang, Jie Zhao, D. X. Lin, Z. J. Sun, H. Loehner, H. J. Li, X. H. Sun, R. Kliemt, Z. A. Zhu, D. Y. Liu, J. B. Jiao, A. Q. Guo, M. Bertani, E. H. Thorndike, L. Q. Qin, Joachim Pettersson, Y. Nefedov, J. Y. Liu, I. B. Nikolaev, J. H. Yin, X. N. Ma, Y. T. Liang, A. Zallo, X. K. Chu, J. C. Li, Z. G. Wang, H. Y. Zhang, J. Zhuang, M. X. Luo, Orhan Cakir, P. Kiese, Alexey Zhemchugov, H. M. Hu, R. Baldini Ferroli, M. Maggiora, W. M. Song, Ling Zhao, Lei Zhao, Z. L. Hou, M. Shao, Y. T. Gu, Q. L. Xiu, X. L. Ji, D. J. Ambrose, J. J. Liang, S. L. Olsen, L. Yang, Yaquan Fang, Jie Yu, G. F. Xu, F. Feldbauer, X. C. Chen, X. Y. Jiang, Q. Gao, Y. N. Gao, Z. H. Wang, E. Fioravanti, Bibo Ke, Y. Zhang, Q. An, R. A. Briere, Jian Wei, Yucheng Huang, D. V. Dedovich, G. F. Chen, C. P. Shen, J. Y. Zhang, W. B. Yan, M. M. Ma, X. N. Li, M. Fritsch, W. P. Wang, Xiaozhong Huang, X. S. Jiang, M. N. Achasov, C. F. Redmer, Xiaocong Ai, C. Leng, S. Jin, Yanwei Wang, Haiping Peng, S. Q. Zhang, Z. H. Qin, W. G. Li, M. Kavatsyuk, J. Z. Fan, J. W. Zhang, S. Pacetti, Zahra Haddadi, X. M. Li, Tao Luo, B. X. Yu, W. Gradl, M. Ripka, Zhi Zeng, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, Peilian Liu, Lingxuan Zhang, Zhiyong Zhang, S. Spataro, X. P. Xu, Q. W. Zhao, D. Y. Wang, Y. Pan, Cui Li, Y. G. Xie, Q. Liu, X. T. Huang, G. Rong, M. H. Ye, C. Z. Yuan, B. X. Zhang, Y. K. Heng, J. M. Bian, S. J. Zhao, G. X. Sun, J. V. Bennett, Lei Li, K. J. Zhu, G. Cibinetto, H. M. Liu, Andrzej Kupsc, W. L. Yuan, L. D. Liu, K. Li, S. Han, M. L. Chen, X. K. Zhou, Fang Liu, Q. Ouyang, L. Y. Dong, I. Denysenko, Q. J. Xu, Y. Guo, X. D. Ruan, J. C. Chen, Xuanhong Lou, Z. Jiao, Fu-Hu Liu, S. X. Du, J. Min, Z. L. Dou, R. Farinelli, S. L. Niu, F. Y. Li, X. Q. Li, G. F. Cao, Shan Wang, Xiao-Rui Lyu, D. H. Zhang, M. Greco, S. S. Fang, Y. H. Zheng, Cong-Feng Qiao, O. Albayrak, Z. T. Sun, Z. A. Liu, K. Schoenning, Q. Y. Li, B. S. Zou, B. Kopf, Nasser Kalantar-Nayestanaki, C. Morales Morales, H. L. Dai, Igor Boyko, J. Q. Zhang, K. L. He, L. L. Ma, L. Gong, Y. B. Liu, Bingxuan Liu, X. Y. Song, N. Yu. Muchnoi, B. Y. Zhang, H. L. Ma, X. S. Kang, V. Prasad, S. Schumann, W. J. Zheng, S. Qian, Jialun Ping, Yao Wang, Jun-Yi Zhang, J. H. Liu, L. G. Xia, D. M. Li, A. Amoroso, Y. P. Guo, Y. H. Zhang, G. S. Varner, Magnus Wolke, K. Zhang, X. Y. Zhang, Y. Ban, P. Weidenkaff, Y. F. Liang, M. Z. Wang, H. J. Lu, Jimin Zhao, J. G. Lu, K. Goetzen, Z. P. Zhang, W. Kuehn, Ke Wang, A. Dbeyssi, M. Albrecht, X. L. Luo, D. P. Jin, W. D. Li, S. P. Wen, M. Pelizaeus, G. Li, K. Y. Liu, M. Lara, J. B. Liu, F. E. Maas, X. S. Qin, X. R. Zhou, T. Hu, Z. B. Li, H. Liang, Y. X. Yang, Z. Y. Wang, Cheng Li, Dayong Wang, N. Qin, Y. J. Sun, P. F. Duan, M. Qi, H. J. Yang, Y. P. Lu, D. W. Bennett, Zujian Wang, A. Julin, F. Bianchi, Y. X. Xia, S. H. Zhu, C. D. Fu, X. Fang, C. Q. Feng, X. R. Chen, P. X. Shen, Z. Wu, F. De Mori, L. W. Jiang, Z. Y. Deng, Fenfen An, Z. L. Huang, Feng Liu, A. Hafner, B. L. Wang, Zhiqing Zhang, M. H. Gu, X. Y. Zhou, Q. Zhao, Y. Z. Sun, M. Ablikim, Y. B. Zhao, Xingguo Li, H. Y. Sheng, X. H. Mo, W. Shan, Xiang Zhou, L. S. Wang, X. Liu, H. R. Qi, J. Dong, C. X. Yu, T. C. Zhao, X. F. Wang, W. C. Yan, O. Fedorov, Y. Q. Wang, Gang Zhao, S. Nisar, J. J. Xu, B. Zheng, R. G. Ping, Q. M. Ma, J. Z. Bai, I. Tapan, S. B. Liu, C. J. Tang, Y. Hu, Serkant Ali Cetin, B. Kloss, Y. B. Li, X. Y. Niu, L. L. Wang, Y. H. Yan, J. W. Zhao, Y. Yuan, J. S. Huang, Y. S. Zhu, Yu Zhang, B. Wang, D. Xiao, L. P. Zhou, C. X. Liu, Y. M. Ma, Y. C. Zhu, H. Cai, I. Uman, Z. P. Mao, H. P. Cheng, H. Xiao, E. Boger, J. Fang, Tao Li, T. Held, Z. Gao, P. Larin, Ch. Rosner, X. B. Ji, S. Z. Chen, P. Patteri, Krisztian Peters, C. Hu, X. Tang, A. Yuncu, Yunlong Zhang, D. Bettoni, J. L. Zhang, R. Poling, Jianping Zheng, G. R. Liao, S. Zhu, J. F. Hu, J. J. Zhang, M. Destefanis, J. F. Sun, S. Marcello, Y. Zeng, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, Zhiqing Liu, T. Johansson, J. F. Chang, O. B. Kolcu, X. Cai, X. Q. Hao, Z. Ning, Chi Zhang, L. Zotti, L. H. Wu, M. Savrie, X. Y. Gao, and L. Xia
Subjects: Physics, 010308 nuclear & particles physics, Electron–positron annihilation, Partial wave analysis, Analytical chemistry, General Physics and Astronomy, Parity (physics), Quantum number, 01 natural sciences, Nuclear magnetic resonance, 0103 physical sciences, Pi, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract: The spin and parity of the Z(c)(3900)(+/-) state are determined to be J(P) = 1(+) with a statistical significance larger than 7 sigma over other quantum numbers in a partial wave analysis of the process e(+)e(-) -> pi(+)pi(-) J/psi We use a data sample of 1.92 fb(-1) accumulated at root s = 4.23 and 4.26 GeV with the BESIII experiment. When parametrizing the Z(c)(3900)(+/-) with a Flatte-like formula, we determine its pole mass M-pole = (3881.2 +/- 4.2(stat) +/- 52.7(syst)) MeV/c(2) and pole width Gamma(pole) = (51.8 +/- 4.6(stat) +/- 36.0(syst)) MeV. We also measure cross sections for the process e(+)e(-) -> Z(c)(3900)(+)pi(-) + c.c. -> J/psi pi(+)pi(-) and determine an upper limit at the 90% confidence level for the process e(+)e(-) -> Z(c)(4020)(+)pi(-) + c.c. -> J/psi pi(+)pi(-).
Published: 2017

241. Branching fraction measurements of ψ(3686)→γχcJ

Author: P. L. Wang, X. L. Luo, Q. Liu, Tristan Weber, L. L. Ma, A. Q. Guo, X. Q. Hao, L. Gong, L. G. Xia, Andrzej Kupsc, M. L. Chen, Y. H. Xie, J. Pellegrino, P. Larin, Zhiqing Liu, W. P. Wang, A. Dbeyssi, L. J. Wu, M. Kornicer, M. Kuemmel, Y. F. Wang, D. Y. Liu, G. Li, Y. J. Mo, Ling Zhao, A. Julin, Lei Zhao, T. Johansson, J. F. Chang, H. J. Lu, J. G. Lu, Z. H. Qin, H. H. Liu, T. Hussain, X. Y. Ma, G. Y. Tang, O. B. Kolcu, W. X. Gong, Jia-Jia Qin, I. Uman, C. D. Fu, Z. J. Xiao, Q. P. Ji, I. R. Boyko, Manuel Lara, Jie Zhao, D. X. Lin, Alexey Zhemchugov, H. M. Hu, Z. L. Hou, J. C. Li, J. Zhuang, X. Cai, L. Lavezzi, F. E. Maas, T. Hu, I. Tapan, Y. H. Yan, R. Farinelli, H. L. Ma, D. M. Li, Liqing Xu, C. H. Li, X. H. Sun, F. H. Liu, Nicolas Berger, J. W. Zhang, Dan Wang, S. Gu, J. F. Sun, C. Q. Feng, X. R. Chen, Z. Y. Deng, M. Ripka, Y. J. Mao, H. X. Yang, I. Garzia, Magnus Wolke, Y. F. Liang, X. Y. Shen, D. P. Jin, J. Min, P. Kiese, Dayong Wang, N. Qin, H. B. Liu, M. Richter, Z. Ning, J. W. Zhao, Y. C. Zhu, O. Bakina, H. Liang, M. X. Luo, H. Muramatsu, M. Pelizaeus, Tao Luo, X. L. Gao, S. Marcello, Y. Zeng, Zhe Sun, R. A. Briere, T. Holtmann, F. Li, F. C. Ma, B. Kopf, J. P. Liu, Bibo Ke, D. V. Dedovich, Xingguo Li, C. Z. Yuan, H. R. Qi, J. G. Messchendorp, F. De Mori, Z. A. Liu, Q. Ouyang, G. S. Huang, X. S. Jiang, K. L. He, S. S. Fang, Y. Ding, B. J. Liu, S. B. Liu, J. Y. Liu, P. X. Shen, Z. Wu, X. Y. Zhou, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, X. K. Zhou, S. W. Han, Y. Nefedov, C. Dong, Y. B. Liu, Qiunan Xu, K. Goetzen, M. Kuhlmann, S. Sosio, Y. P. Guo, B. X. Yu, Zhi Zeng, J. J. Song, V. Prasad, W. Kühn, Xiao-Rui Lyu, W. B. Yan, H. Xiao, Zhiqing Zhang, S. Pacetti, Jimin Zhao, Q. Gao, Y. N. Gao, Y. X. Xia, Y. Zhang, P. L. Li, W. G. Li, A. G. Denig, T. Held, G. Felici, Y. K. Sun, Mario Greco, Z. Y. You, O. Cakir, S. Spataro, Y. X. Zhou, Y. Y. Liu, Serkant Ali Cetin, J. F. Qiu, X. F. Wang, J. Z. Bai, C. F. Redmer, Z. A. Zhu, Q. M. Ma, A. Mustafa, L. Fava, M. Bertani, Ke Liu, F. Y. Li, H. S. Chen, Q. A. Malik, G. Mezzadri, W. C. Yan, Alperen Yuncu, Jin Li, Z. Haddadi, L. Yang, Joachim Pettersson, G. S. Varner, H. M. Liu, F. Nerling, X. Y. Niu, Z. Gao, S. L. Niu, Y. Ban, P. Weidenkaff, H. J. Li, Y. Yuan, Y. S. Zhu, X. Q. Li, Yu Zhang, C. P. Shen, X. Q. He, H. L. Dai, Y. G. Gao, Q. L. Xiu, G. F. Cao, M. N. Achasov, L. P. Zhou, L. D. Liu, Y. F. Long, L. Zotti, Fang Liu, M. G. Zhao, Y. H. Yang, R. P. Guo, U. Wiedner, I. Denysenko, G. R. Liao, X. P. Xu, X. B. Ji, M. Tiemens, Y. M. Ma, B. Q. Wang, M. Maggiora, S. Ahmed, Y. X. Yang, M. Destefanis, C. Hu, A. Calcaterra, Z. G. Zhao, S. Fegan, Z. P. Mao, X. Tang, Ke Wang, C. Leng, P. Patteri, W. Gradl, S. P. Wen, J. Fang, Tao Li, J. J. Xu, K. Y. Liu, J. B. Jiao, H. H. Zhang, B. Y. Zhang, Z. J. Sun, G. A. Chelkov, D. Y. Wang, S. Q. Zhang, M. Qi, R. Kliemt, Z. B. Li, W. Ikegami Andersson, Q. Zhao, X. S. Qin, Y. Z. Sun, H. J. Yang, R. Poling, P. F. Duan, F. H. Heinsius, Z. G. Wang, Gianfranco Morello, Ch. Rosner, X. R. Zhou, X. L. Ji, Fenfen An, B. L. Wang, M. Y. Dong, Jie Yu, J. S. Huang, Cheng Li, C. X. Liu, T. C. Zhao, Yaquan Fang, Shou-hua Zhu, M. Albrecht, H. Y. Zhang, W. D. Li, T. J. Min, K. J. Zhu, Gang Zhao, J. H. Zou, Z. Y. Zhang, F. A. Harris, L. Koch, H. B. Li, S. S. Sun, H. Leithoff, G. Cibinetto, R. Baldini Ferroli, C. L. Luo, K. Schoenning, Q. Y. Li, B. S. Zou, J. Q. Zhang, Y. H. Zheng, Krisztian Peters, X. K. Chu, M. Z. Wang, Y. G. Xie, C. C. Zhang, B. T. Tsednee, B. Zhong, L. B. Guo, Yunlong Zhang, G. F. Chen, R. E. Mitchell, D. Bettoni, X. N. Li, J. Y. Zhang, Lei Li, J. L. Zhang, Haiping Peng, Z. L. Dou, Jianping Zheng, Cong-Feng Qiao, T. Ma, S. Zhu, N. Yu. Muchnoi, G. F. Xu, S. X. Du, S. Jin, Peilian Liu, Lingxuan Zhang, X. S. Kang, Y. H. Zhang, S. L. Olsen, Xichao Ruan, F. Bianchi, M. H. Gu, S. Qian, H. Y. Sheng, Q. An, Jialun Ping, A. Amoroso, C. X. Yu, Y. K. Heng, J. M. Bian, B. Zheng, R. G. Ping, X. Y. Song, Z. Y. Wang, K. Zhang, X. Y. Zhang, S. J. Zhao, J. B. Liu, Y. J. Sun, X. H. Liu, E. Boger, Y. P. Lu, Q. J. Xu, J. C. Chen, J. P. Dai, Xuanhong Lou, Nasser Kalantar-Nayestanaki, C. Morales Morales, Yue Pan, Yao Wang, T. Khan, X. Fang, F. Feldbauer, Z. L. Huang, Feng Liu, M. Ablikim, X. Y. Jiang, X. N. Ma, M. H. Ye, M. Fritsch, L. Y. Dong, M. Kavatsyuk, W. J. Zheng, I. B. Nikolaev, J. H. Yin, O. Dorjkhaidav, M. Shao, Y. T. Gu, B. X. Zhang, E. Fioravanti, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, X. H. Mo, L. S. Wang, L. L. Wang, H. Cai, L. H. Wu, M. Savrie, Y. J. Xiao, Z. H. Wang, P. Musiol, C. Schnier, Y. Q. Wang, X. T. Huang, G. Rong, X. A. Xiong, A. A. Zafar, C. Sowa, Y. B. Zhao, W. Shan, K. H. Rashid, J. Dong, Y. T. Liang, S. J. Chen, S. Nisar, K. J. Li, C. J. Tang, Y. Hu, D. Xiao, M. M. Ma, J. Chai, G. X. Sun, J. V. Bennett, Li Yan, Z. Jiao, D. H. Zhang, Jun-Yi Zhang, Z. P. Zhang, D. W. Bennett, Zujian Wang, and Xiaozhong Huang
Subjects: Physics, Nuclear magnetic resonance, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences
Abstract: Using a sample of 106 million psi(3686) decays, the branching fractions of psi(3686) -> gamma chi(c0), psi(3686) -> gamma chi(c1), and psi(3686) -> gamma chi(c2) are measured with improved precision to be (9.389 +/- 0.014 +/- 0.332) %, (9.905 +/- 0.011 +/- 0.353) %, and (9.621 +/- 0.013 +/- 0.272) %, respectively, where the first uncertainties are statistical and the second ones are systematic. The product branching fractions of (psi 3686) -> gamma chi(c1), chi(c1) -> gamma J/psi (3686) -> gamma chi(c2), chi(c2) -> gamma J/psi and the branching fractions of chi(c1) -> gamma J/psi and chi(c2) -> gamma J/psi are also presented.
Published: 2017

242. Observation of e+e−→ηhc at center-of-mass energies from 4.085 to 4.600 GeV

Author: Y. J. Mao, H. X. Yang, I. Garzia, Y. H. Zheng, L. D. Liu, Cong-Feng Qiao, O. Albayrak, X. L. Gao, N. Yu. Muchnoi, X. S. Kang, Y. H. Zhang, J. P. Liu, J. G. Messchendorp, J. P. Dai, Qiunan Xu, S. L. Olsen, Yao Wang, Z. Y. Wang, A. Q. Guo, W. M. Song, F. De Mori, W. P. Wang, Z. H. Qin, F. Li, E. H. Thorndike, H. B. Li, C. Dong, X. Y. Zhou, X. H. Liu, L. Q. Qin, J. J. Xu, I. Tapan, Y. H. Yan, Y. H. Guan, F. C. Ma, X. C. Chen, Y. B. Zhao, Z. A. Liu, S. Sosio, B. Kloss, T. Holtmann, J. Y. Liu, C. L. Luo, X. F. Wang, Magnus Wolke, Y. F. Liang, D. P. Jin, V. Prasad, G. Li, X. Fang, Q. M. Ma, J. M. Bian, S. J. Zhao, B. J. Liu, F. Feldbauer, Z. L. Huang, Feng Liu, L. J. Wu, Y. Ban, P. Weidenkaff, X. Y. Niu, Y. Yuan, Y. S. Zhu, S. P. Wen, X. Y. Jiang, W. G. Li, A. G. Denig, S. B. Liu, S. Spataro, J. S. Huang, C. X. Liu, C. C. Zhang, J. W. Zhao, Yu Zhang, Y. C. Zhu, W. Shan, J. Dong, L. H. Wu, M. Savrie, B. Zhong, L. B. Guo, X. S. Qin, X. L. Ji, G. A. Chelkov, Y. F. Wang, X. R. Zhou, Y. J. Mo, Y. Nefedov, Q. Liu, X. N. Ma, Y. Y. Liu, H. M. Liu, G. F. Cao, S. Nisar, C. J. Tang, Y. Hu, G. Felici, Lei Li, Joachim Pettersson, Tristan Weber, M. H. Ye, Y. P. Lu, Cheng Li, C. D. Fu, N. Qin, M. Qi, Q. J. Xu, Y. H. Xie, G. F. Xu, Q. Gao, Y. N. Gao, L. L. Ma, D. Xiao, J. F. Qiu, M. Papenbrock, J. C. Chen, Y. Zhang, Q. An, H. J. Lu, J. G. Lu, Z. Y. Zhang, S. Jin, L. Gong, L. Fava, Fang Liu, M. Fritsch, Xuanhong Lou, U. Wiedner, I. Denysenko, M. Kavatsyuk, H. Xiao, L. G. Xia, M. Maggiora, Ling Zhao, A. A. Zafar, C. Q. Feng, T. Hussain, T. Held, X. R. Chen, Mario Greco, A. Amoroso, I. Uman, Jun-Yi Zhang, H. J. Yang, Nasser Kalantar-Nayestanaki, J. Z. Fan, Z. Y. Deng, M. Ripka, X. Y. Ma, K. H. Rashid, X. K. Chu, Y. Guo, Y. T. Liang, Lei Zhao, F. E. Maas, L. Y. Dong, T. Hu, W. X. Gong, L. Zotti, B. X. Zhang, C. Morales Morales, Yue Pan, Z. L. Hou, F. Nerling, A. Dbeyssi, D. J. Ambrose, Yunlong Zhang, S. J. Chen, T. Ma, K. J. Li, Z. P. Zhang, D. W. Bennett, Zujian Wang, H. J. Li, Q. P. Ji, H. R. Qi, Z. G. Wang, H. Y. Zhang, Xingguo Li, W. J. Zheng, Xiaocong Ai, M. Kornicer, D. Bettoni, Q. L. Xiu, B. Y. Zhang, Z. H. Wang, R. Farinelli, J. L. Zhang, X. Y. Song, P. Musiol, O. Bakina, Y. G. Xie, A. Calcaterra, Z. G. Zhao, P. L. Wang, C. Schnier, Y. Q. Wang, Liqing Xu, Y. P. Guo, X. Y. Shen, Jianping Zheng, M. M. Ma, X. T. Huang, M. Ablikim, G. Rong, H. L. Ma, A. Julin, J. Z. Bai, G. F. Chen, X. L. Luo, M. Albrecht, D. M. Li, H. Muramatsu, S. Zhu, H. H. Zhang, Dan Wang, P. X. Shen, W. D. Li, Z. L. Dou, Serkant Ali Cetin, M. Pelizaeus, C. Z. Yuan, Z. J. Sun, H. Loehner, J. Chai, Y. Ding, J. Y. Zhang, Z. Wu, L. W. Jiang, X. H. Mo, G. X. Sun, J. V. Bennett, Li Yan, Bibo Ke, L. S. Wang, F. Bianchi, S. Ahmed, S. X. Du, Y. X. Yang, W. B. Yan, K. Y. Liu, C. H. Li, Peilian Liu, X. H. Sun, J. F. Sun, Z. Jiao, D. H. Zhang, Z. J. Xiao, Zhiqing Zhang, Lingxuan Zhang, M. N. Achasov, L. L. Wang, H. Cai, S. Q. Zhang, J. B. Jiao, J. J. Zhang, Z. Gao, M. Destefanis, K. Goetzen, H. H. Liu, J. C. Li, I. B. Nikolaev, S. Marcello, F. A. Harris, A. Hafner, Q. Zhao, Y. Z. Sun, S. Pacetti, S. L. Niu, Zhiqing Liu, Y. Zeng, C. Hu, Xiao-Rui Lyu, X. P. Xu, X. B. Ji, M. Tiemens, J. H. Yin, J. Zhuang, C. Leng, D. Y. Liu, W. Kühn, Zhe Sun, M. Shao, Y. T. Gu, Z. Y. You, Z. A. Zhu, X. Tang, H. Leithoff, X. Q. Li, Y. F. Long, R. Baldini Ferroli, M. X. Luo, E. Fioravanti, Gang Zhao, D. V. Dedovich, M. Y. Dong, P. Patteri, M. Bertani, Z. Haddadi, Jiaxi Liu, Krisztian Peters, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, T. Johansson, J. F. Chang, J. S. Lange, Q. W. Zhao, Xichao Ruan, Yang Li, L. Yang, M. Z. Wang, G. S. Varner, Y. K. Heng, C. P. Shen, Y. B. Chen, J. H. Zou, J. Q. Zhang, Xiaofeng Zhu, J. Z. Zhang, Q. Ouyang, Xiaozhong Huang, K. J. Zhu, S. S. Sun, S. S. Fang, M. H. Gu, Z. B. Li, X. N. Li, O. B. Kolcu, W. Ikegami Andersson, Y. B. Liu, S. Qian, Jialun Ping, K. Zhang, H. Y. Sheng, R. Kliemt, C. X. Yu, P. Kiese, Andrzej Kupsc, R. E. Mitchell, X. Cai, X. Y. Zhang, Haiping Peng, J. B. Liu, M. L. Chen, R. A. Briere, G. S. Huang, Y. J. Sun, E. Boger, X. S. Jiang, B. Zheng, R. G. Ping, Jie Yu, W. Gradl, G. R. Liao, B. Q. Wang, O. Cakir, T. J. Min, Z. Ning, D. Y. Wang, M. G. Zhao, R. P. Guo, G. Cibinetto, Y. N. Zhang, Ke Wang, J. Min, H. B. Liu, B. Kopf, K. L. He, X. K. Zhou, S. W. Han, Jimin Zhao, C. F. Redmer, R. Poling, P. F. Duan, F. H. Heinsius, Fenfen An, B. L. Wang, T. C. Zhao, Tao Luo, Yaquan Fang, Shou-hua Zhu, B. X. Yu, Zhi Zeng, F. Y. Li, H. S. Chen, Alperen Yuncu, Jin Li, H. L. Dai, Igor Boyko, K. Schoenning, Q. Y. Li, B. S. Zou, Niklaus Berger, Q. A. Malik, G. Mezzadri, W. C. Yan, L. P. Zhou, Y. M. Ma, Z. P. Mao, J. Fang, Tao Li, Ch. Rosner, H. Liang, Manuel Lara, Jie Zhao, D. X. Lin, Alexey Zhemchugov, H. M. Hu, F. H. Liu, J. W. Zhang, Y. X. Xia, X. Q. Hao, P. Larin, and S. Z. Chen
Subjects: Physics, Nuclear physics, Cross section (physics), Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Center of mass, 010306 general physics, 01 natural sciences
Abstract: We observe for the first time the process e(+) e(-) -> eta h(c) with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy root s = 4.226 GeV, and the Born cross section is measured to be (9.5(-2.0)(+2.2)) pb. Evidence for eta h(c) is observed at root s = 4.358 GeV with a Born cross section of (10.0(-2.7)(+3.1)) pb, and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.
Published: 2017

243. Observation of ψ(3686)→e+e−χcJ and χcJ→e+e−J/ψ

Author: M. Kuemmel, Matthew Glenn Kurth, M. M. Ma, X. F. Cui, C. X. Liu, Y. X. Zhao, Y. H. Xie, G. S. Huang, E. M. Gersabeck, W. J. Zhu, I. Uman, Fang Liu, U. Wiedner, I. Denysenko, Shuai Liu, Cheng Li, M. G. Zhao, X. X. Ma, R. P. Guo, J. Zhu, Guangyi Zhang, M. Maggiora, Ling Zhao, S. Ahmed, Y. X. Yang, Bibo Ke, W. B. Yan, H. B. Liu, F. Li, F. C. Ma, X. L. Luo, X. D. Shi, Dan Wang, Z. X. Meng, A. A. Zafar, Christoph Herold, F. De Mori, R. Kappert, G. X. Sun, Li Yan, Z. Jiao, Lei Zhao, Z. L. Hou, S. Pacetti, B. Kopf, W. Y. Han, X. D. Zhang, Shan Wang, Xiao-Rui Lyu, K. H. Rashid, L. J. Wu, X. Wu, W. G. Li, A. G. Denig, G. Y. Tang, X. H. Xie, P. T. Ge, Z. J. Xiao, X. Y. Zhou, H. Y. Zhang, G. F. Xu, R. E. de Boer, M. Q. Jing, Y. H. Zheng, Cong-Feng Qiao, Y. H. Tan, Ke Li, K. Begzsuren, W. P. Wang, F. Bianchi, S. L. Yang, Jie Zhao, K. L. He, Alexey Zhemchugov, H. M. Hu, Ziyi Wang, G. F. Chen, J. Y. Zhang, J. Q. Li, Wen-Zhao Liu, J. Libby, Y. T. Liang, M. R. An, S. J. Chen, S. Spataro, A. Calcaterra, Z. G. Zhao, Y. B. Zhao, M. Albrecht, S. Jin, Q. Zhao, M. Y. Dong, Ke Wang, Lei Li, A. Lavania, Z. Ning, S. Y. Xiao, J. H. Zou, Y. Z. Sun, H. M. Liu, Xujin Yuan, F. H. Liu, S. Y. Li, Y. K. Heng, Yaquan Fang, M. Greco, S. S. Sun, M. Z. Wang, J. F. Hu, Jimin Zhao, W. Shan, W. Y. Sun, L. Z. Liao, J. Dong, I. B. Nikolaev, S. B. Liu, G. R. Liao, C. Z. Yuan, T. T. Han, X. Sun, N. Cao, W. D. Li, X. F. Wang, Nicolas Berger, Li Yuan, Y. Y. Wang, J. B. Zhao, Shou-hua Zhu, R. E. Mitchell, S. J. Zhao, Q. P. Ji, I. R. Boyko, G. Wilkinson, N. Yu. Muchnoi, C. H. Heinz, X. S. Kang, Z. A. Liu, Yu Bai, L. Zhang, H. H. Zhang, J. Bloms, Y. Nefedov, I. K. Keshk, G. F. Cao, D. Y. Liu, J. H. Yin, R. Poling, J. W. Zhang, R. Aliberti, F. H. Heinsius, N. Hüsken, X D Shi, T. Liu, L. H. Wu, Ayut Limphirat, Q. J. Xu, A. Bortone, Xuanhong Lou, S. Nisar, John Jake Lane, Viktor Thorén, M. Shao, Y. T. Gu, Q. M. Ma, Y. J. Mao, Guoqiang Yu, S. H. Zhang, X. Y. Shen, C. J. Tang, Y. Hu, Huanhuan Liu, J. F. Qiu, Nasser Kalantar-Nayestanaki, M. Lellmann, S. Maldaner, C. X. Lin, Alexander Leon Gilman, M. Rump, Gang Zhao, W. S. Cheng, Yao Zhang, Y. H. Zhang, K. Schoenning, S. L. Olsen, G. Li, C. F. Redmer, M. Qi, C. J. Xu, K. H. Qi, Yue Pan, X. L. Ji, Y. P. Lu, H. J. Li, X. K. Zhou, H. X. Yang, L. Koch, A. Khoukaz, J. F. Sun, I. Garzia, I. Balossino, B. S. Zou, C. X. Yue, H. B. Li, V. Prasad, C. L. Luo, Q. Zhou, Yi Jin, G. Felici, Y. Ding, H. J. Wang, L. Fava, Zhi Yang, M. Kuessner, R. Baldini Ferroli, X. L. Wang, B. J. Liu, Y. C. Xu, Krisztian Peters, S. Malde, S. Marcello, Y. Zeng, B. Zhong, L. B. Guo, Y. Yuan, K. Goetzen, X. Q. Hao, H. J. Yang, Y. T. Tian, T. Y. Xing, K. Ravindran, Z. Y. Wang, D. Y. Chen, Jinfei Wu, J. L. Liu, Zhe Sun, B. Wang, F. Nerling, Z. Y. Zhang, J. X. Teng, H. Liang, M. Scodeggio, S. Janchiv, Huihui Liu, A. N. Zhu, Haiping Peng, S. Nakhoul, M. Fritsch, S. Jaeger, Y. Ban, Tao Luo, Tao Sun, X. Dong, W. Kühn, Y. B. Chen, B. X. Yu, Teresa Lenz, Andrzej Kupsc, Yanping Huang, Y. C. Zhu, M. Kavatsyuk, C. Zhong, J. Z. Zhang, C. D. Fu, C. Q. Feng, H. C. Shi, X. R. Chen, Y. G. Xie, H. S. Sang, J. J. Song, L. Sun, Xu Yan, Q. Liu, P. Larin, Shulei Zhang, H. S. Chen, Jin Li, R. Farinelli, G. A. Chelkov, Xu Shan, J. G. Messchendorp, R. S. Shi, Y. B. Liu, H. L. Dai, W. Imoehl, Y. Y. Ji, M. X. Luo, Dylan Jaide White, X. H. Liu, L. Q. Qin, R. T. Ma, Jianyu Zhang, Jie Feng, A. Q. Zhang, H. Xiao, Z. Y. Deng, D. V. Dedovich, H. L. Ma, Ke Liu, Hai-Tian Wang, J. D. Lu, Z. Y. You, Z. A. Zhu, Q. A. Malik, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, D. M. Li, J. P. Dai, C. Schnier, Y. Q. Wang, Zujian Wang, G. Mezzadri, S. F. Zhang, Lei Zhang, W. C. Yan, A. Q. Guo, X. L. Lu, C. W. Wang, B. X. Zhang, L. L. Ma, Zhiqiang Liu, Libo Zhang, X. H. Li, L. Gong, L. Wollenberg, C. P. Shen, X. T. Huang, Tong Zhu, H. Muramatsu, T. Lin, S. P. Wen, G. Rong, H. F. Shen, L. M. Gu, M. N. Achasov, J. F. Shangguan, Meng Wang, M. L. Chen, T. Y. Qi, L. P. Zhou, W. M. Song, Muhammad Irshad, L. G. Xia, M. Himmelreich, M. Pelizaeus, Z. P. Mao, C. Geng, Xingchao Dai, A. Amoroso, W. H. Wang, T. Yu, T. Johansson, J. F. Chang, J. Fang, Y. F. Wang, Y. L. Fan, O. B. Kolcu, H. R. Qi, T. Holtmann, R. Kliemt, P. P. Su, X. Cai, L. Lavezzi, A. Dbeyssi, D. C. Shan, A. Mangoni, F. A. Harris, J. Y. Liu, W. L. Chang, Yan Zhang, Ch. Rosner, Wenbin Qian, K. Y. Liu, X. S. Qin, X. R. Zhou, M. Bertani, X. H. Mo, F. X. Lu, Z. H. Qin, M. H. Ye, Y. G. Gao, A. Guskov, Jie Yu, Angelo Rivetti, H. Leithoff, L. Yang, Y. N. Gao, L. L. Wang, H. Cai, Y. Zhang, L. Q. Huang, Zongyuan Wang, Feng Yan, H. B. Jiang, Jiawei Zhang, S. Q. Qu, F. Feldbauer, W. Gradl, T. J. Min, Y. X. Song, K. J. Zhu, L. Y. Dong, Z. H. Lei, F. Weidner, W. Ikegami Andersson, Q. Ouyang, G. Cibinetto, Z. L. Huang, Feng Liu, P. W. Luo, X. H. Bai, S. S. Fang, C. Y. Guan, Zhang Li, M. Ablikim, Xiaoyu Li, Magnus Wolke, Y. F. Liang, V. Rodin, P. Kiese, X. P. Xu, X. B. Ji, P. Patteri, Yuan Hou, R. A. Briere, X. S. Jiang, Yao Wang, S. Pogodin, Wei Xu, F. F. Sui, P. Adlarson, M. H. Gu, R. Kiuchi, Z. J. Chen, K. X. Su, T. Hussain, X. Y. Ma, W. X. Gong, C. X. Yu, A. Pathak, C. H. Li, W. H. Tian, B. Zheng, R. G. Ping, Xiangcheng Pan, Zhenxiong Yuan, Peilian Liu, Y. X. Tan, X. P. Qin, J. Q. Zhang, H. J. Lu, J. G. Lu, F. E. Maas, T. Hu, X. L. Li, O. Bakina, P. X. Shen, Z. Wu, Y. Schelhaas, Y. P. Guo, Serkant Ali Cetin, J. B. Jiao, H. K. Sun, S. Qian, Q. An, Jialun Ping, X. Y. Zhang, J. B. Liu, Y. J. Sun, Yifan Yang, J. L. Li, M. Rolo, F. Cossio, Ruiting Ma, Z. Qian, J. Tang, Yunlong Zhang, M. H. Liu, D. Bettoni, J. L. Zhang, Jianping Zheng, S. X. Du, M. Destefanis, G. Y. Hou, C. Dong, S. Sosio, X. Zeng Zeng, Joachim Pettersson, and L. D. Liu
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, General Physics and Astronomy, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, 010306 general physics, 01 natural sciences, Mathematical physics
Abstract: Using 4.479 x 10(8) psi(3686) events collected with the BESIII detector, we search for the decays psi(3686) -> e(+)e(-)chi(cJ) and chi(cJ) -> e(+)e(-)J/psi, where J = 0, 1, 2. The decays psi(3686) -> e(+)e(-)chi(cJ) and chi(cJ) -> e(+)e(-)J/psi are observed for the first time. The measured branching fractions are B(psi(3686) -> e(+)e(-)chi(cJ)) = (11.7 +/- 2.5 +/- 1.0) x 10(-4), (8.6 +/- 0.3 +/- 0.6) x 10(-4), (6.9 +/- 0.5 +/- 0.6) x 10(-4) for J = 0, 1, 2, and B(chi(cJ) -> e(+)e(-)J/psi) = (1.51 +/- 0.30 +/- 0.13)x10(-4), (3.73 +/- 0.09 +/- 0.25)x10(-3), (2.48 +/- 0.08 +/- 0.16)x10(-3) for J = 0, 1, 2, respectively. The ratios of the branching fractions B(psi(3686) -> e(+)e(-)chi(cJ))/B(psi(3686) -> gamma chi(cJ)) and B(chi(cJ) -> e(+)e(-)J/psi)/B(chi(cJ) -> gamma J/psi) are also reported. Also, the alpha values of helicity angular distributions of the e(+)e(-) pair are determined for psi(3686) -> e(+)e(-)chi(c1,2) and chi(c1,2) -> e(+)e(-)J/psi.
Published: 2017

244. Improved measurements of branching fractions for ηc→ϕϕ and ωϕ

Author: X. Y. Jiang, M. M. Ma, Bibo Ke, W. B. Yan, Zahra Haddadi, M. N. Achasov, J. M. Bian, S. Pacetti, H. B. Li, Y. Pan, A. G. Denig, C. L. Luo, S. J. Zhao, C. C. Zhang, B. Zhong, L. B. Guo, G. X. Sun, J. V. Bennett, Ke Li, M. Qi, Z. Jiao, Fu-Hu Liu, D. H. Zhang, H. Muramatsu, Ulrich Wiedner, Q. J. Xu, H. J. Yang, J. C. Chen, Xuanhong Lou, T. Ma, Nasser Kalantar-Nayestanaki, J. F. Sun, X. L. Ji, G. A. Chelkov, Xiaozhong Huang, C. Morales Morales, F. Li, X. K. Zhou, Y. B. Liu, Fang Liu, P. L. Wang, F. C. Ma, Talib Hussain, I. Denysenko, I. Tapan, I. Uman, Y. H. Yan, W. C. Yan, B. Y. Zhang, Andrzej Kupsc, W. L. Yuan, J. W. Zhao, M. L. Chen, X. L. Luo, J. F. Qiu, Y. C. Zhu, L. P. Zhou, S. Marcello, Y. Zeng, S. B. Liu, L. Fava, Magnus Wolke, M. Y. Dong, Y. M. Ma, Y. F. Liang, D. P. Jin, F. Nerling, J. C. Li, Dayong Wang, N. Qin, M. Tiemens, Q. Liu, Jun-Yi Zhang, Yanwei Wang, Y. P. Guo, Jin Li, H. Xiao, Z. P. Mao, J. Zhuang, M. Ullrich, Z. J. Xiao, A. Yuncu, W. G. Li, J. H. Zou, Y. H. Zheng, M. X. Luo, H. P. Cheng, J. Fang, Tao Li, Cong-Feng Qiao, J. Min, S. S. Sun, O. Albayrak, S. L. Niu, T. Held, Y. H. Guan, Yucheng Huang, D. V. Dedovich, Z. P. Zhang, Y. G. Xie, X. D. Ruan, F. Y. Li, X. Q. Li, Z. Ning, Y. B. Chen, Z. Gao, P. Larin, W. P. Wang, Kai Liu, S. X. Du, H. J. Lu, J. G. Lu, B. Kopf, N. Yu. Muchnoi, Xiaofeng Zhu, J. Z. Zhang, M. Greco, Ch. Rosner, G. F. Xu, R. E. Mitchell, F. Bianchi, M. G. Zhao, R. P. Guo, X. S. Kang, L. L. Ma, L. Gong, K. L. He, Klaus Peters, D. W. Bennett, Zujian Wang, Z. L. Dou, A. Calcaterra, Z. G. Zhao, F. E. Maas, Y. H. Zhang, Z. T. Sun, S. Z. Chen, T. Hu, M. Z. Wang, D. J. Ambrose, S. Jin, L. G. Xia, Y. N. Zhang, Jimin Zhao, A. Amoroso, R. Baldini Ferroli, Y. Nefedov, H. H. Zhang, S. J. Chen, Z. J. Sun, H. Loehner, S. Spataro, X. P. Xu, Z. G. Wang, Z. Y. Wang, H. Y. Zhang, R. Kliemt, Y. Guo, H. Liang, I. B. Nikolaev, Xiao-Rui Lyu, A. Dbeyssi, Q. P. Ji, Y. B. Zhao, P. X. Shen, Z. Wu, M. Bertani, L. Yang, M. Albrecht, K. Y. Liu, Z. B. Li, Z. A. Liu, H. Y. Chen, G. F. Chen, Zhiqing Liu, W. D. Li, L. W. Jiang, W. Shan, M. Kornicer, J. Dong, Zhiqing Zhang, X. Y. Song, X. N. Li, Y. X. Xia, S. H. Zhu, E. H. Thorndike, P. Kiese, J. Y. Zhang, Lei Li, Cui Li, H. M. Liu, T. Johansson, J. F. Chang, Haiping Peng, Y. Q. Wang, A. Julin, J. H. Liu, Jie Yu, C. Leng, Ke Wang, G. S. Varner, L. Q. Qin, S. L. Olsen, R. A. Briere, Z. H. Wang, S. Nisar, C. J. Tang, W. Gradl, K. Goetzen, Chi Zhang, O. B. Kolcu, X. Cai, Y. Hu, M. Ripka, F. De Mori, F. Feldbauer, X. S. Jiang, Y. P. Lu, G. F. Cao, Y. K. Heng, D. Y. Wang, C. F. Redmer, Xiaocong Ai, V. Prasad, J. Q. Zhang, P. F. Duan, Fenfen An, X. Q. Hao, X. Y. Zhou, B. Wang, X. C. Chen, B. L. Wang, T. C. Zhao, X. T. Huang, Yu Zhang, A. A. Zafar, D. Xiao, G. Rong, O. Cakir, O. Fedorov, T. J. Min, Tao Luo, Q. Ouyang, X. F. Wang, L. Zotti, S. Han, Yunlong Zhang, B. X. Yu, Zhi Zeng, K. J. Zhu, S. S. Fang, Q. M. Ma, Jie Zhao, D. X. Lin, D. Bettoni, S. Qian, Jialun Ping, B. Kloss, Y. F. Wang, A. Q. Guo, F. A. Harris, H. M. Hu, Yaquan Fang, L. H. Wu, G. R. Liao, X. Y. Niu, Y. Ban, P. Weidenkaff, Y. Yuan, Y. S. Zhu, J. F. Hu, G. Cibinetto, W. M. Song, J. L. Zhang, M. Savrie, H. L. Dai, Igor Boyko, J. W. Zhang, X. Y. Ma, W. X. Gong, G. Felici, X. Y. Gao, L. Xia, K. Zhang, R. Poling, Z. H. Qin, Jianping Zheng, Y. J. Mao, H. X. Yang, X. H. Sun, H. J. Li, S. Zhu, I. Garzia, J. Z. Bai, Q. L. Xiu, Huihui Liu, J. P. Liu, J. G. Messchendorp, J. P. Dai, Qiunan Xu, M. Shi, X. Y. Zhang, K. Schoenning, Q. Y. Li, B. S. Zou, J. J. Xu, S. P. Wen, J. J. Zhang, M. Destefanis, Y. B. Li, X. S. Qin, X. R. Zhou, X. B. Ji, X. L. Gao, P. Patteri, Cheng Li, J. S. Huang, Bingxuan Liu, C. Dong, S. Sosio, M. Lara, G. Li, J. B. Liu, C. D. Fu, C. Q. Feng, Joachim Pettersson, X. R. Chen, Z. Y. Deng, C. X. Liu, C. Hu, Xingguo Li, X. Tang, Y. J. Sun, E. Boger, M. H. Gu, H. Y. Sheng, S. Schumann, Yao Wang, C. X. Yu, X. Liu, H. R. Qi, B. Zheng, R. G. Ping, X. K. Chu, X. N. Ma, Y. T. Liang, A. Zallo, Serkant Ali Cetin, Peilian Liu, D. Y. Liu, J. B. Jiao, M. Fritsch, Lingxuan Zhang, Zhiyong Zhang, Y. Ding, B. J. Liu, M. Kavatsyuk, W. Kühn, S. Q. Zhang, R. Farinelli, Z. A. Zhu, H. L. Ma, D. M. Li, B. X. Zhang, C. P. Shen, L. J. Wu, X. Fang, Z. L. Huang, M. Pelizaeus, Feng Liu, Y. J. Mo, M. Ablikim, Y. X. Yang, J. H. Yin, K. H. Rashid, M. Shao, Y. T. Gu, H. S. Chen, T. Weber, E. Fioravanti, H. B. Liu, A. Hafner, Q. Zhao, Y. Z. Sun, X. L. Kang, A. Sarantsev, Xiang Zhou, D. H. Wei, P. R. Li, J. S. Lange, Q. W. Zhao, Liqing Xu, X. Y. Shen, M. H. Ye, Gang Zhao, L. D. Liu, L. Y. Dong, J. Y. Liu, W. J. Zheng, Q. Gao, Y. N. Gao, Y. Zhang, Q. An, J. Z. Fan, A. Zhemchugov, X. H. Mo, L. S. Wang, L. L. Wang, H. Cai, Guangshun Huang, L. Yan, M. Maggiora, Ling Zhao, Lei Zhao, Z. L. Hou, and C. Z. Yuan
Subjects: Physics, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Analytical chemistry, Branching (polymer chemistry), 01 natural sciences, Omega, 0103 physical sciences, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract: Using (223.7 +/- 1.4) x 10(6) J / Psi events accumulated with the BESIII detector, we study eta(c) decays to phi phi and omega phi final states. The branching fraction of n(c) -> phi phi is measured to be Br(eta(c) -> phi phi) = (2.5 +/- 0(-0.7)(+0.3) +/- 0.6) X 10(-3,) where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of Br(J / Psi -> gamma eta(C)). No significant signal for the double Okubo-Zweig-Iizuka suppressed decay of eta(c) -> omega phi is observed, and the upper limit on the branching fraction is determined to be Br(eta(c) -> omega phi) < 2.5 x 10(-4) at the 90% confidence level.
Published: 2017

245. Search for the radiative leptonic decay D+→γe+νe

Author: L. Q. Qin, F. Feldbauer, J. Min, X. C. Chen, J. Z. Bai, T. Holtmann, B. Kopf, J. J. Xu, J. Y. Liu, L. J. Wu, K. L. He, Xiaozhong Huang, Y. J. Mo, Q. Gao, Q. Liu, X. D. Ruan, Y. N. Gao, M. H. Gu, Y. Zhang, Q. An, Y. B. Li, M. Z. Wang, L. L. Ma, L. Gong, H. Y. Sheng, Yao Wang, L. G. Xia, A. Amoroso, J. S. Huang, J. Z. Fan, A. Zhemchugov, Jimin Zhao, C. X. Liu, X. B. Ji, M. Tiemens, Andrzej Kupsc, A. Dbeyssi, C. Hu, T. Weber, X. Tang, X. H. Mo, L. S. Wang, C. Leng, C. X. Yu, P. Patteri, M. H. Ye, M. Kornicer, M. L. Chen, X. L. Ji, A. Julin, S. Ahmed, Y. X. Yang, Q. P. Ji, Z. H. Wang, M. Y. Dong, B. Zheng, R. G. Ping, L. L. Wang, H. Cai, G. A. Chelkov, A. Calcaterra, Z. G. Zhao, S. Fegan, Liqing Xu, X. Y. Shen, Q. Ouyang, Talib Hussain, K. J. Zhu, K. Goetzen, J. Q. Zhang, D. J. Ambrose, P. Musiol, C. F. Redmer, C. Schnier, A. Hafner, Y. X. Xia, S. H. Zhu, Q. Zhao, F. De Mori, Y. J. Mao, Z. T. Sun, Xiaocong Ai, H. B. Liu, S. S. Fang, X. Y. Zhou, Y. Z. Sun, Xiang Zhou, H. X. Yang, I. Garzia, L. D. Liu, Y. Ding, J. H. Zou, M. Albrecht, X. T. Huang, M. Ablikim, A. A. Zafar, B. J. Liu, V. Prasad, Y. B. Liu, W. D. Li, P. Kiese, S. Han, H. J. Lu, Yunlong Zhang, J. G. Lu, H. H. Zhang, L. Y. Dong, Y. Ban, P. Weidenkaff, F. H. Heinsius, R. Kliemt, Magnus Wolke, Y. F. Liang, D. P. Jin, X. F. Wang, Gang Zhao, W. Kühn, Jun-Yi Zhang, F. Li, D. Bettoni, Y. H. Zheng, Cong-Feng Qiao, Y. P. Guo, J. L. Zhang, R. Poling, M. Maggiora, Yanwei Wang, Jianping Zheng, L. H. Wu, F. E. Maas, Huihui Liu, T. Hu, Z. P. Zhang, S. L. Olsen, R. A. Briere, Y. H. Guan, O. Albayrak, W. J. Zheng, S. S. Sun, Ling Zhao, Q. M. Ma, A. Yuncu, X. Liu, S. Zhu, J. P. Liu, B. Kloss, X. Fang, Z. Y. You, Dayong Wang, X. Y. Niu, Jin Li, N. Yu. Muchnoi, M. Savrie, Jie Yu, Z. A. Zhu, F. Nerling, P. L. Li, Y. G. Xie, S. P. Wen, H. R. Qi, Z. J. Sun, Kai Liu, X. S. Kang, X. S. Qin, H. Loehner, X. R. Zhou, Y. H. Zhang, I. Tapan, Y. H. Yan, X. S. Jiang, Z. L. Huang, Feng Liu, N. Qin, Y. Yuan, Y. S. Zhu, Xian Gao, Michael Papenbrock, D. W. Bennett, Zujian Wang, J. W. Zhao, J. J. Zhang, O. Bakina, J. G. Messchendorp, M. Destefanis, Z. Ning, Cheng Li, Y. C. Zhu, Lei Zhao, R. E. Mitchell, Z. L. Hou, J. H. Yin, K. H. Rashid, C. P. Shen, M. Shao, Y. T. Gu, R. Farinelli, Q. A. Malik, G. F. Xu, S. Z. Chen, J. P. Dai, M. G. Zhao, S. X. Du, Qiunan Xu, H. Xiao, Z. Y. Wang, T. Held, K. Li, P. X. Shen, Y. Nefedov, C. Dong, S. Sosio, X. K. Zhou, R. P. Guo, Y. H. Xie, X. N. Ma, Y. T. Liang, X. Y. Jiang, Z. J. Xiao, E. Fioravanti, F. C. Ma, Fang Liu, Z. L. Dou, Z. Wu, H. L. Ma, M. M. Ma, P. R. Li, M. Bertani, Z. Haddadi, Y. N. Zhang, T. J. Min, X. K. Chu, L. W. Jiang, H. J. Li, I. Denysenko, L. Yang, H. B. Li, Joachim Pettersson, D. M. Li, A. G. Denig, M. Fritsch, C. L. Luo, Q. L. Xiu, Serkant Ali Cetin, X. L. Kang, A. Sarantsev, D. H. Wei, Y. Guo, J. S. Lange, Q. W. Zhao, Y. Pan, Klaus Peters, Zhiqing Zhang, W. G. Li, S. J. Chen, O. Cakir, Cui Li, J. M. Bian, M. Kavatsyuk, J. Chai, G. X. Sun, J. V. Bennett, S. J. Zhao, P. L. Wang, B. Y. Zhang, M. Pelizaeus, X. Y. Song, C. C. Zhang, B. Zhong, L. B. Guo, G. Cibinetto, Y. F. Wang, Z. Jiao, Fu-Hu Liu, B. X. Zhang, D. H. Zhang, C. Z. Yuan, X. L. Luo, Xiao-Rui Lyu, S. Spataro, X. P. Xu, Y. Y. Liu, Y. B. Zhao, W. Shan, J. Dong, H. Muramatsu, Ulrich Wiedner, Q. J. Xu, Y. Q. Wang, Peilian Liu, S. Nisar, J. C. Chen, Xuanhong Lou, C. J. Tang, W. P. Wang, Y. Hu, Y. P. Lu, F. Bianchi, Z. A. Liu, Lingxuan Zhang, G. S. Varner, T. Ma, Bibo Ke, B. Wang, X. Y. Ma, Nasser Kalantar-Nayestanaki, W. B. Yan, W. X. Gong, D. Xiao, S. Qian, Jialun Ping, K. Zhang, J. F. Qiu, X. Y. Zhang, Guangshun Huang, L. Yan, M. N. Achasov, Lei Li, C. Morales Morales, J. C. Li, Zhiyong Zhang, Giulietto Felici, Z. G. Wang, S. Pacetti, L. Fava, J. Zhuang, M. X. Luo, H. Y. Zhang, Haiwen Liu, D. V. Dedovich, L. Xia, G. F. Chen, W. Gradl, M. Ripka, J. Y. Zhang, X. H. Sun, Bingxuan Liu, D. Y. Wang, M. Qi, G. R. Liao, S. L. Niu, F. Y. Li, X. Q. Li, Y. F. Long, M. Greco, H. J. Yang, J. F. Sun, G. F. Cao, S. Marcello, Y. Zeng, M. Lara, J. B. Liu, L. Zotti, Y. J. Sun, E. Boger, S. Jin, G. Li, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, K. Y. Liu, Z. B. Li, W. Ikegami Andersson, A. Q. Guo, G. Rong, H. Leithoff, W. M. Song, F. A. Harris, C. D. Fu, C. Q. Feng, X. R. Chen, S. B. Liu, Z. H. Qin, Z. Y. Deng, Zhiqing Liu, D. Y. Liu, J. B. Jiao, Yuekun Heng, Xingguo Li, T. Johansson, J. F. Chang, S. Q. Zhang, O. B. Kolcu, X. Cai, X. Q. Hao, Tao Luo, B. X. Yu, Zhi Zeng, H. S. Chen, H. L. Dai, Igor Boyko, R. Baldini Ferroli, X. N. Li, Haiping Peng, J. H. Liu, Ke Wang, G. Mezzadri, W. C. Yan, P. F. Duan, Gianfranco Morello, Yu Zhang, Fenfen An, B. L. Wang, T. C. Zhao, L. P. Zhou, Y. M. Ma, Z. P. Mao, J. Fang, Tao Li, Z. Gao, Ch. Rosner, Yaquan Fang, K. Schoenning, Q. Y. Li, B. S. Zou, Niklaus Berger, H. Liang, I. B. Nikolaev, Jianhao Zhang, Jie Zhao, D. X. Lin, H. M. Hu, I. Uman, P. Larin, E. H. Thorndike, and İstanbul Arel Üniversitesi
Subjects: Physics, Photon, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Photon energy, 01 natural sciences, Nuclear physics, Factorization, 0103 physical sciences, Radiative transfer, High Energy Physics::Experiment, 010306 general physics, Energy (signal processing)
Abstract: Using an electron-positron collision data sample of 2.93 fb(-1) collected at a center-of-mass energy of root s = 3.773 GeV with the BESIII detector, we present the first search for the radiative leptonic decay D+ -> gamma e(+)nu(e). The analysis is performed with a double-tag method. We do not observe a significant D+ -> gamma e(+)nu(e) signal, and obtain an upper limit on the branching fraction of D+ -> gamma e(+)nu(e) decay with the energy of radiative photon larger than 10 MeV of 3.0 x 10(-5) at the 90% confidence level.
Published: 2017

246. Amplitude analysis of D0→K−π+π+π−

Author: M. Qi, H. J. Yang, J. F. Sun, Q. A. Malik, G. Mezzadri, W. C. Yan, H. J. Lu, J. G. Lu, S. Marcello, Y. Zeng, Zhe Sun, F. E. Maas, T. Hu, W. G. Li, A. G. Denig, Z. Gao, S. L. Niu, M. N. Achasov, X. L. Li, X. M. Li, L. P. Zhou, X. Q. Li, S. Spataro, F. De Mori, G. A. Chelkov, Y. M. Ma, Y. Y. Liu, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, Z. P. Mao, Z. Ning, P. L. Wang, P. X. Shen, J. M. Bian, S. J. Zhao, X. Y. Zhou, R. Baldini Ferroli, Z. Wu, X. K. Zhou, H. P. Cheng, J. Fang, Tao Li, H. M. Liu, Y. H. Guan, B. J. Liu, Zhiqing Liu, I. B. Nikolaev, J. H. Yin, L. W. Jiang, T. Johansson, J. F. Chang, K. Y. Liu, Y. F. Wang, O. B. Kolcu, X. Cai, H. B. Li, J. F. Hu, J. B. Jiao, Z. B. Li, Krisztian Peters, M. Z. Wang, Fang Liu, B. Kloss, Xiaozhong Huang, C. L. Luo, L. Zotti, M. Shao, Y. T. Gu, Zhiqing Zhang, L. J. Wu, F. A. Harris, G. F. Cao, Q. J. Xu, X. N. Li, Ch. Rosner, M. Bertani, S. B. Liu, U. Wiedner, I. Denysenko, X. F. Wang, Manuel Lara, Z. Haddadi, C. C. Zhang, Z. P. Zhang, H. Leithoff, Y. H. Zheng, M. Maggiora, Ling Zhao, J. C. Chen, Xuanhong Lou, D. J. Ambrose, Q. M. Ma, T. Hussain, Cong-Feng Qiao, O. Albayrak, E. Fioravanti, M. M. Ma, L. Yang, Jie Zhao, D. X. Lin, Haiping Peng, X. Y. Ma, B. Zhong, L. B. Guo, Y. Nefedov, T. Holtmann, Andrzej Kupsc, A. Q. Guo, Z. H. Wang, Lei Li, W. X. Gong, Alexey Zhemchugov, H. M. Hu, J. J. Liang, Lei Zhao, Z. L. Hou, Y. J. Mo, Nasser Kalantar-Nayestanaki, N. Yu. Muchnoi, Ke Wang, F. H. Liu, J. Y. Liu, C. Morales Morales, X. S. Kang, F. Li, B. Y. Zhang, F. C. Ma, X. Y. Niu, W. M. Song, P. Musiol, Yaquan Fang, M. Greco, Nicolas Berger, Shou-hua Zhu, C. Leng, Xiaocong Ai, Yue Pan, Y. Yuan, Y. S. Zhu, X. L. Kang, A. Sarantsev, Y. H. Zhang, M. L. Chen, G. R. Liao, D. H. Wei, P. R. Li, Yunlong Zhang, J. S. Lange, Q. W. Zhao, S. L. Olsen, C. Schnier, Y. Q. Wang, Yu Zhang, M. Albrecht, X. H. Sun, Q. Gao, T. Ma, G. F. Xu, Y. N. Gao, Yanping Huang, J. W. Zhang, W. Gradl, Y. Zhang, X. T. Huang, H. S. Chen, Jiaxi Liu, Shan Wang, Xiao-Rui Lyu, M. H. Ye, R. Poling, P. F. Duan, F. H. Heinsius, Fenfen An, S. Jin, G. Rong, W. P. Wang, B. L. Wang, Z. H. Qin, J. F. Qiu, Cen Zhang, Karin Schönning, J. Z. Fan, W. D. Li, C. Z. Yuan, J. Q. Zhang, X. N. Ma, D. Bettoni, Z. Y. Wang, P. Kiese, L. Y. Dong, D. Y. Wang, J. Min, S. Qian, Q. An, Jialun Ping, K. Zhang, L. Fava, T. C. Zhao, A. A. Zafar, G. X. Sun, J. V. Bennett, Li Yan, Q. P. Ji, Y. J. Mao, F. Nerling, Q. Liu, Tristan Weber, X. Y. Zhang, I. R. Boyko, H. B. Liu, H. X. Yang, I. Garzia, Z. Jiao, E. H. Thorndike, R. A. Briere, Q. Y. Li, B. S. Zou, Cui Li, A. Zallo, B. Kopf, O. Fedorov, X. S. Jiang, X. H. Liu, L. Q. Qin, J. B. Liu, M. G. Zhao, D. H. Zhang, L. L. Ma, R. Farinelli, Bibo Ke, L. Gong, A. Calcaterra, Z. G. Zhao, Y. J. Sun, K. H. Rashid, X. L. Luo, L. G. Xia, J. L. Zhang, I. Uman, W. J. Zheng, Jianping Zheng, I. Tapan, R. P. Guo, Tao Luo, K. L. He, S. W. Han, Y. N. Zhang, E. Boger, B. X. Yu, Y. P. Lu, H. L. Ma, Y. X. Xia, B. Wang, Liqing Xu, X. Y. Shen, A. Amoroso, J. P. Liu, A. Dbeyssi, Y. H. Yan, W. B. Yan, J. W. Zhao, Z. G. Wang, Zhi Zeng, Jimin Zhao, H. Y. Zhang, M. Fritsch, J. G. Messchendorp, J. P. Dai, G. S. Varner, Y. T. Liang, H. H. Zhang, S. Zhu, Z. J. Sun, H. Loehner, Y. Ding, S. Pacetti, G. S. Huang, D. M. Li, H. Muramatsu, X. C. Chen, Qiunan Xu, M. Shi, O. Cakir, Jun-Yi Zhang, M. Kornicer, Y. C. Zhu, G. F. Chen, Z. J. Xiao, C. F. Redmer, S. J. Chen, F. Y. Li, Alperen Yuncu, Jin Li, J. Y. Zhang, K. J. Li, F. Bianchi, M. Pelizaeus, X. Y. Song, S. Ahmed, M. Kavatsyuk, Y. X. Yang, Jean Pettersson, A. Julin, H. Liang, Dan Wang, H. L. Dai, H. R. Qi, S. X. Du, D. W. Bennett, Zujian Wang, H. H. Liu, J. C. Li, H. Xiao, T. Held, X. H. Mo, L. S. Wang, D. Y. Liu, S. Q. Zhang, J. Zhuang, X. Q. Hao, M. Y. Dong, Y. P. Guo, J. J. Zhang, M. Destefanis, Y. K. Heng, L. L. Wang, H. Cai, L. H. Wu, A. Hafner, Q. Zhao, Y. Z. Sun, M. Savrie, M. X. Luo, G. Felici, Jian Wei, Serkant Ali Cetin, B. X. Zhang, D. V. Dedovich, Z. A. Zhu, P. Larin, J. H. Zou, X. L. Ji, S. Z. Chen, C. Hu, Y. B. Zhao, X. Y. Gao, K. Goetzen, S. S. Sun, W. Shan, Gang Zhao, H. J. Li, J. Dong, X. Tang, Q. L. Xiu, C. P. Shen, W. Khn, R. E. Mitchell, Z. Y. Zhang, S. Nisar, C. J. Tang, Y. Hu, Magnus Wolke, W. L. Yuan, S. Schumann, Q. Ouyang, S. S. Fang, Yao Wang, Y. B. Liu, Y. F. Liang, D. P. Jin, D. Xiao, Y. G. Xie, N. Qin, K. J. Zhu, Z. L. Dou, X. L. Gao, X. Fang, F. Feldbauer, L. D. Liu, C. Dong, S. Sosio, Z. L. Huang, Feng Liu, J. J. Xu, M. Ablikim, X. Y. Jiang, J. S. Huang, C. X. Liu, Y. N. Guo, R. Kliemt, Jie Yu, G. Cibinetto, G. Li, C. D. Fu, C. Q. Feng, X. R. Chen, Z. Y. Deng, M. Ripka, J. Z. Bai, X. P. Xu, X. B. Ji, M. Tiemens, P. Patteri, Xichao Ruan, Yang Li, M. H. Gu, H. Y. Sheng, C. X. Yu, B. Zheng, R. G. Ping, X. K. Chu, Peilian Liu, Lingxuan Zhang, Z. A. Liu, V. Prasad, Y. Ban, P. Weidenkaff, S. P. Wen, X. S. Qin, X. R. Zhou, and Cheng Li
Subjects: Physics, Amplitude, 010308 nuclear & particles physics, 0103 physical sciences, Detector, Pi, Resonance, Atomic physics, 010306 general physics, 01 natural sciences
Abstract: We present an amplitude analysis of the decay D-0 -> K- pi(+)pi(+)pi(-) based on a data sample of 2.93 fb(-1) acquired by the BESIII detector at the psi(3770) resonance. With a nearly background ...
Published: 2017

247. Measurement of higher-order multipole amplitudes in ψ(3686)→γχc1,2 with χc1,2→γJ/ψ and search for the transition ηc(2S)→γJ/ψ

Author: J. M. Bian, S. J. Zhao, D. Y. Liu, J. B. Jiao, X. H. Mo, L. S. Wang, M. Maggiora, Ling Zhao, Y. Ding, M. H. Ye, Q. J. Xu, R. Kliemt, X. K. Zhou, Fang Liu, Lei Zhao, Z. L. Hou, H. B. Li, A. G. Denig, B. J. Liu, Jie Yu, G. Felici, Tao Luo, Yunlong Zhang, J. C. Chen, Xuanhong Lou, S. Q. Zhang, K. J. Zhu, C. L. Luo, I. Denysenko, J. Min, G. Cibinetto, L. L. Wang, Nasser Kalantar-Nayestanaki, F. De Mori, Z. T. Sun, H. Cai, C. Morales Morales, Bingxuan Liu, C. C. Zhang, B. X. Yu, B. Zhong, L. B. Guo, D. Bettoni, W. Kühn, G. Li, J. Z. Bai, Jie Zhao, B. Kopf, C. D. Fu, C. Q. Feng, D. X. Lin, X. R. Chen, Y. H. Guan, X. B. Ji, M. Tiemens, Z. Y. Deng, P. Patteri, X. Y. Zhou, Zhi Zeng, H. M. Hu, B. Y. Zhang, Xingguo Li, H. Liang, J. L. Zhang, H. Muramatsu, Ulrich Wiedner, I. B. Nikolaev, Z. A. Liu, K. L. He, C. Z. Yuan, X. N. Ma, Kai Liu, Z. A. Zhu, J. H. Yin, Q. P. Ji, H. J. Li, R. Poling, K. H. Rashid, I. Tapan, Y. H. Yan, S. J. Chen, Z. G. Wang, M. Z. Wang, Y. T. Liang, M. Shao, Y. T. Gu, H. S. Chen, H. Y. Zhang, X. L. Ji, A. Zallo, Jianping Zheng, T. Ma, Q. L. Xiu, S. Zhu, Jimin Zhao, J. W. Zhao, J. W. Zhang, E. H. Thorndike, S. B. Liu, V. Prasad, X. F. Wang, Q. M. Ma, H. L. Dai, Igor Boyko, M. Y. Dong, Y. Ban, P. Weidenkaff, E. Fioravanti, Y. C. Zhu, G. A. Chelkov, Y. Nefedov, G. F. Chen, B. Kloss, X. Liu, C. Leng, H. R. Qi, J. Y. Zhang, Talib Hussain, C. P. Shen, H. Xiao, H. B. Liu, L. Q. Qin, J. J. Liang, M. Bertani, X. Y. Niu, X. L. Kang, A. Sarantsev, A. Calcaterra, Z. G. Zhao, Y. Yuan, Y. S. Zhu, M. Fritsch, Z. H. Wang, S. P. Wen, Z. Haddadi, J. H. Zou, Guangshun Huang, G. Mezzadri, W. C. Yan, L. Yan, D. H. Wei, P. R. Li, J. S. Lange, Q. W. Zhao, T. Held, R. Baldini Ferroli, Yu Zhang, L. J. Wu, L. Yang, J. J. Zhang, M. Kavatsyuk, F. Feldbauer, X. S. Qin, X. R. Zhou, H. H. Zhang, G. F. Xu, S. S. Sun, S. Jin, Y. K. Heng, Y. X. Xia, S. H. Zhu, Y. J. Mo, C. F. Redmer, Xiaocong Ai, Serkant Ali Cetin, Q. Ouyang, M. N. Achasov, L. P. Zhou, M. Destefanis, Y. M. Ma, Z. J. Sun, H. Loehner, D. J. Ambrose, S. S. Fang, Q. Liu, Jin Li, L. D. Liu, Z. P. Mao, A. Yuncu, A. Zhemchugov, Y. B. Liu, Cheng Li, S. Qian, X. T. Huang, A. A. Zafar, Cui Li, L. Y. Dong, R. E. Mitchell, G. Rong, W. Gradl, L. L. Ma, Q. An, Jialun Ping, J. Q. Zhang, B. X. Zhang, K. Zhang, M. Ripka, H. P. Cheng, J. Fang, Tao Li, T. Weber, L. Gong, X. N. Li, Y. G. Xie, X. Y. Zhang, P. L. Wang, J. C. Li, L. G. Xia, A. Amoroso, M. Albrecht, D. Y. Wang, M. Qi, Z. Gao, W. J. Zheng, X. C. Chen, X. L. Luo, M. Lara, J. Zhuang, J. B. Liu, H. J. Yang, S. X. Du, Bibo Ke, H. J. Lu, J. G. Lu, W. B. Yan, M. X. Luo, Y. J. Sun, C. Hu, X. Tang, X. Y. Song, X. Fang, I. Uman, Ch. Rosner, A. Dbeyssi, Jian Wei, Yuyi Wang, Yucheng Huang, Haiping Peng, D. V. Dedovich, E. Boger, S. Han, W. D. Li, Y. P. Lu, Xichao Ruan, Z. L. Dou, W. P. Wang, F. E. Maas, T. Hu, M. H. Gu, Liqing Xu, M. Kornicer, F. Bianchi, X. Y. Shen, Z. L. Huang, Feng Liu, Yaquan Fang, S. Pacetti, H. Y. Sheng, A. Julin, M. G. Zhao, R. P. Guo, M. Ablikim, K. Goetzen, J. H. Liu, Ke Li, P. Larin, C. X. Yu, Y. N. Zhang, S. Z. Chen, L. H. Wu, P. X. Shen, Z. Wu, M. Savrie, L. W. Jiang, Ke Wang, Shan Wang, Xiao-Rui Lyu, B. Zheng, R. G. Ping, Zhiqing Zhang, S. Schumann, X. K. Chu, Yao Wang, K. Schoenning, Q. Y. Li, B. S. Zou, P. F. Duan, Peilian Liu, J. J. Xu, X. Y. Gao, L. Xia, Y. B. Li, Lingxuan Zhang, Y. H. Zheng, Zhiyong Zhang, X. L. Gao, Cong-Feng Qiao, O. Albayrak, J. S. Huang, Fenfen An, C. X. Liu, B. L. Wang, N. Yu. Muchnoi, T. C. Zhao, O. Fedorov, G. S. Varner, Magnus Wolke, Y. F. Liang, X. S. Kang, Y. H. Zhang, D. P. Jin, Y. F. Wang, C. Dong, Krisztian Peters, S. Sosio, Dayong Wang, N. Qin, X. Y. Ma, W. X. Gong, Xiaozhong Huang, Andrzej Kupsc, W. L. Yuan, X. H. Sun, M. L. Chen, S. L. Niu, F. Y. Li, X. Q. Li, M. Greco, Joachim Pettersson, Y. N. Guo, M. Ullrich, Z. J. Xiao, K. Y. Liu, Z. B. Li, Z. Y. Wang, P. Kiese, G. R. Liao, J. F. Hu, S. L. Olsen, R. A. Briere, X. S. Jiang, O. Cakir, J. F. Sun, S. Marcello, Y. Zeng, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, L. Zotti, F. A. Harris, Chi Zhang, Z. Ning, Zhiqing Liu, X. P. Xu, T. Johansson, J. F. Chang, O. B. Kolcu, X. Cai, X. Q. Hao, A. Q. Guo, W. M. Song, H. Leithoff, F. Li, F. C. Ma, Z. H. Qin, Y. J. Mao, H. X. Yang, I. Garzia, J. F. Qiu, Huihui Liu, J. P. Liu, L. Fava, J. G. Messchendorp, J. P. Dai, F. Nerling, Qiunan Xu, M. Shi, W. G. Li, X. M. Li, S. Spataro, Lei Li, H. M. Liu, G. F. Cao, Y. X. Yang, A. Hafner, Q. Zhao, Y. Z. Sun, Xiang Zhou, Gang Zhao, J. Y. Liu, Jun-Yi Zhang, Y. P. Guo, Q. Gao, Y. N. Gao, Z. P. Zhang, Y. Zhang, D. W. Bennett, Zujian Wang, J. Z. Fan, Y. B. Zhao, W. Shan, R. Farinelli, J. Dong, Y. Q. Wang, H. L. Ma, D. M. Li, S. Nisar, C. J. Tang, Y. Hu, M. Pelizaeus, B. Wang, D. Xiao, X. Y. Jiang, M. M. Ma, Y. Pan, G. X. Sun, J. V. Bennett, Z. Jiao, Fu-Hu Liu, and D. H. Zhang
Subjects: Physics, Amplitude, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, High Energy Physics::Experiment, 010306 general physics, Multipole expansion, 01 natural sciences, Gamma gamma
Abstract: Using 106 x 10(6) psi(3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay psi(3686) ->; gamma chi(c1,2) -> gamma gamma J/psi beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole (M2) amplitude for psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi and the normalized electric-dipole amplitudes for psi(3686) -> gamma chi(c2) -> gamma J/psi and determined. The M2 amplitudes for psi(3686) -> gamma chi(c1) and ; chi(c1,2) -> gamma J/psi are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of psi(3686) and J/psi decays to;2,chi(c1,2,) b(2)(1/)b(2)(2) = 1.35 +/- 0.72 and a(2)(1/)a(2)(2) = 0.617 +/- 0.083,,which agree well with theoretical expectations. By considering the multipole contributions of chi(c1,2), we measure the product branching fractions for the cascade decays psi(3686) -> gamma chi(c 0,1,2) -> gamma gamma J/psi and search for the process eta(c)(2s) -> gamma J/psi through psi(3686) -> gamma eta(c)(2s).The product branching fraction for psi(3686) -> gamma chi(c0) -> gamma gamma J/psi is 3 sigma larger than published measurements, while those of psi(3686) -> gamma chi(c1,2) -> gamma gamma J/psi are consistent. No significant signal for the decay psi(3686) -> gamma eta(c) (2s) -> gamma gamma J/psi is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined.
Published: 2017

248. Observation of Λc+→nKS0π+

Author: C. C. Zhang, X. N. Ma, B. Zhong, L. B. Guo, F. Li, S. Qian, M. Fritsch, H. Muramatsu, Ulrich Wiedner, S. L. Niu, F. C. Ma, Jialun Ping, K. Zhang, X. Y. Zhang, M. Kavatsyuk, F. Y. Li, X. Q. Li, M. Kornicer, T. Ma, M. Lara, J. B. Liu, M. Qi, X. L. Ji, M. Greco, J. Z. Bai, Jin Li, Y. J. Sun, B. X. Zhang, Z. J. Xiao, Z. H. Wang, P. Musiol, C. F. Redmer, Xiaocong Ai, Y. P. Lu, C. Schnier, X. T. Huang, Yu Zhang, G. Rong, Y. X. Xia, S. H. Zhu, R. Baldini Ferroli, Y. H. Guan, J. F. Qiu, Q. Liu, X. D. Ruan, Y. J. Mao, H. X. Yang, L. L. Ma, L. Gong, L. Fava, H. J. Yang, Kai Liu, X. B. Ji, X. H. Mo, L. S. Wang, K. Y. Liu, T. Holtmann, I. Garzia, S. Han, L. H. Wu, K. Li, M. Savrie, M. G. Zhao, H. Liang, H. J. Lu, X. K. Zhou, Fang Liu, R. P. Guo, Z. B. Li, M. H. Ye, X. K. Chu, X. N. Li, W. Ikegami Andersson, X. L. Gao, Y. Nefedov, L. G. Xia, A. Amoroso, J. G. Lu, P. Patteri, X. Liu, J. Y. Liu, J. P. Liu, L. Xia, R. Kliemt, Y. N. Zhang, A. A. Zafar, K. H. Rashid, I. Denysenko, J. F. Sun, Y. T. Liang, Yanwei Wang, Yao Wang, Haiping Peng, Tao Luo, Y. G. Xie, S. J. Chen, H. R. Qi, F. E. Maas, A. Dbeyssi, Magnus Wolke, Jie Yu, T. Hu, J. G. Messchendorp, J. P. Dai, D. J. Ambrose, O. Bakina, Y. F. Liang, L. L. Wang, H. Cai, J. M. Bian, S. J. Zhao, A. Calcaterra, Z. G. Zhao, B. X. Yu, Zhi Zeng, B. Y. Zhang, C. Dong, S. Sosio, Peilian Liu, S. Marcello, D. P. Jin, T. J. Min, K. J. Zhu, G. Cibinetto, Q. Gao, Y. N. Gao, Qiunan Xu, Y. Zeng, Y. Zhang, Q. An, Y. F. Wang, P. X. Shen, Z. Wu, Serkant Ali Cetin, Bingxuan Liu, S. X. Du, Z. L. Dou, Lingxuan Zhang, Cui Li, Q.J. Liu, Zhiyong Zhang, H. H. Zhang, A. Julin, Dayong Wang, L. W. Jiang, N. Qin, Jie Zhao, Yuehong Xie, J. Z. Fan, Q. J. Xu, G. Li, Z. J. Sun, H. Loehner, G. Felici, Guangshun Huang, L. Yan, D. X. Lin, Zhiqing Zhang, Y. Ding, Y. B. Chen, Xiaofeng Zhu, J. Z. Zhang, Y. B. Zhao, T. Hussain, H. L. Dai, Igor Boyko, A. Q. Guo, X. Y. Ma, C. D. Fu, C. Q. Feng, X. R. Chen, F. De Mori, Alexey Zhemchugov, H. M. Hu, J. C. Chen, Xuanhong Lou, Z. Y. Deng, D. Y. Liu, J. B. Jiao, Xiaozhong Huang, B. J. Liu, Bibo Ke, Yaquan Fang, W. B. Yan, W. Shan, C. Leng, Nasser Kalantar-Nayestanaki, W. X. Gong, Joachim Pettersson, S. Ahmed, Y. X. Yang, H. H. Liu, Xiao-Rui Lyu, M. H. Gu, M. N. Achasov, Xingguo Li, X. Fang, C. Morales Morales, M. Albrecht, W. M. Song, J. C. Li, J. Dong, X. Y. Zhou, L. D. Liu, Z. G. Wang, L. Y. Dong, S. Pacetti, Krisztian Peters, J. H. Liu, H. Y. Sheng, Andrzej Kupsc, Ke Wang, P. L. Wang, Z. L. Huang, H. Y. Zhang, S. B. Liu, M. L. Chen, Feng Liu, A. Hafner, Q. Zhao, Y. Z. Sun, M. Y. Dong, M. Ablikim, W. D. Li, G. S. Varner, J. Q. Zhang, S. Q. Zhang, Y. Q. Wang, G. R. Liao, J. F. Hu, J. W. Zhang, X. F. Wang, M. Tiemens, G. F. Chen, H. B. Liu, G. A. Chelkov, C. X. Yu, J. Zhuang, P. F. Duan, M. X. Luo, Q. M. Ma, J. Y. Zhang, S. Nisar, W. Kühn, C. J. Tang, Xiang Zhou, Fenfen An, B. L. Wang, Yunlong Zhang, D. Bettoni, T. C. Zhao, J. Min, B. Zheng, R. G. Ping, Z. T. Sun, Z. A. Liu, J. H. Zou, Z. Y. You, Z. A. Zhu, Gang Zhao, S. S. Sun, W. J. Zheng, F. Nerling, X. H. Sun, Y. Hu, B. Kloss, D. V. Dedovich, V. Prasad, K. Schoenning, Q. Y. Li, B. S. Zou, X. Y. Niu, J. L. Zhang, Niklaus Berger, Q. A. Malik, G. Mezzadri, R. Poling, F. A. Harris, I. Uman, Y. Ban, P. Weidenkaff, F. H. Heinsius, Y. Yuan, Y. S. Zhu, R. E. Mitchell, Y. K. Heng, W. C. Yan, R. Farinelli, B. Wang, W. P. Wang, Z. H. Qin, H. J. Li, B. Kopf, S. P. Wen, X. S. Qin, C. P. Shen, H. L. Ma, D. Xiao, M. Maggiora, Jianping Zheng, Ling Zhao, X. R. Zhou, S. Zhu, L. J. Wu, Cheng Li, D. M. Li, Y. J. Mo, I. Tapan, Q. L. Xiu, M. Pelizaeus, Y. H. Yan, K. L. He, Lei Zhao, Z. L. Hou, H. Leithoff, I. B. Nikolaev, J. H. Yin, M. Shao, Y. T. Gu, P. Kiese, S. L. Olsen, R. A. Briere, L. P. Zhou, Y. M. Ma, J. W. Zhao, H. S. Chen, T. Weber, Z. P. Mao, Q. P. Ji, Liqing Xu, J. Fang, Tao Li, Y. C. Zhu, E. Fioravanti, C. Z. Yuan, X. Y. Shen, P. Larin, X. S. Jiang, Jun-Yi Zhang, Z. Gao, M. Z. Wang, Ch. Rosner, W. G. Li, Jimin Zhao, X. L. Luo, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, J. S. Lange, J. J. Zhang, Q. W. Zhao, M. Destefanis, Y. P. Guo, H. Xiao, E. Boger, C. Hu, X. Tang, Z. P. Zhang, S. Z. Chen, A. Yuncu, T. Held, D. W. Bennett, Zujian Wang, O. Cakir, M. Bertani, S. Spataro, X. P. Xu, F. Bianchi, X. Y. Jiang, Y. Y. Liu, M. M. Ma, Zahra Haddadi, L. Yang, Y. Pan, Lei Li, G. X. Sun, J. V. Bennett, Z. Jiao, Fu-Hu Liu, D. H. Zhang, H. M. Liu, G. F. Cao, W. Gradl, M. Ripka, D. Y. Wang, Q. Ouyang, S. S. Fang, Y. B. Liu, L. Zotti, J. J. Xu, Y. B. Li, Zhiqing Liu, J. S. Huang, C. X. Liu, T. Johansson, J. F. Chang, O. B. Kolcu, X. Cai, L. Lavezzi, X. Q. Hao, K. Goetzen, Z. Ning, G. F. Xu, S. Jin, Y. Guo, X. Y. Song, Y. H. Zheng, Cong-Feng Qiao, O. Albayrak, N. Yu. Muchnoi, X. S. Kang, Y. H. Zhang, Z. Y. Wang, E. H. Thorndike, L. Q. Qin, F. Feldbauer, X. C. Chen, H. B. Li, A. G. Denig, and C. L. Luo
Subjects: Physics, Particle physics, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Analytical chemistry, General Physics and Astronomy, Lambda, 01 natural sciences, Baryon, Charmed baryons, Isospin, 0103 physical sciences, Pi, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics
Abstract: We report the first direct measurement of decays of the Lambda(+)(c) baryon involving the neutron. The analysis is performed using 567 pb(-1) of e(+)e(-) collision data collected at root s = 4.599 GeV with the BESIII detector at the BEPCII collider. We observe the decay Lambda(+)(c) -> nK(S)(0)pi(+) and measure the absolute branching fraction to be B(Lambda(+)(c) -> nK(S)(0)pi(+)) = [1.82 +/- 0.23(stat) +/- 0.11(syst)]%. A comparison to B[Lambda(+)(c) -> p( (K) over bar pi)(0)] provides an important test of isospin symmetry and final state interactions.
Published: 2017

249. Precise Measurement of the e+e−→π+π−J/ψ Cross Section at Center-of-Mass Energies from 3.77 to 4.60 GeV

Author: Teng Li, B. S. Zou, D. Y. Liu, J. P. Dai, Jianmin Dong, Yong Ban, Y. D. Wang, J. F. Qiu, S. Q. Zhang, C. F. Qiao, Z. Ning, K. Li, K. Zhang, J. Lange, Q. P. Ji, Lei Li, W. X. Gong, Y. J. Mao, G. Cibinetto, F. C. Ma, M. Maggiora, Wei Li, R. G. Ping, J. V. Bennett, T. Holtmann, J. S. Yu, S. S. Fang, Xuejun Wang, Hongji Yang, Kejun Zhu, Q. J. Xu, Zhiyong Zhang, A. Sarantsev, X. H. Sun, Guangshun Huang, L. Yan, Q. Gao, Lei Zhao, Q. An, H. R. Qi, X. C. Lou, Zhen Wang, Yiming Zhang, F. A. Harris, J. Y. Zhang, Yuehong Xie, A. Dbeyssi, J. Min, Z. J. Xiao, M. H. Gu, X. D. Ruan, L. L. Ma, H. Loehner, L. Gong, Ming-Xing Luo, X. N. Ma, A. Zhemchugov, L. S. Wang, Y. T. Liang, Qi Liu, X. D. Chen, Zhiqing Liu, X. L. Ji, Z. B. Li, M. Kavatsyuk, Bibo Ke, Yuekun Heng, E. H. Thorndike, S. P. Wen, C. D. Fu, G. Rong, Wolfgang Kuhn, Serkant Ali Cetin, H. Leithoff, P. F. Duan, H. H. Zhang, Bingxuan Liu, S. Jin, Xingtao Huang, L. Lavezzi, B. L. Wang, M. N. Achasov, Giulietto Felici, Xiaozhong Huang, X. B. Ji, Mingshui Chen, A. Amoroso, W. M. Song, Sai-Juan Chen, S. Pacetti, Y. H. Zheng, Fang Liu, Y. F. Wang, H. Muramatsu, Hao Liang, M. Wolke, Z. Wu, O. B. Kolcu, Jian Zhuang, Y. B. Li, A. Denig, Jin Li, Qun Ouyang, Jian Fang, S. H. Zhu, X. H. Mo, W. P. Wang, Yingchun Zhu, Orhan Cakir, M. Lara, P. Kiese, Siyuan Sun, M. Shao, A. Q. Guo, Andrzej Kupsc, C. Leng, Xu Zhou, H. B. Li, Shou-hua Zhu, M. Tiemens, X. Q. Hao, R. Kliemt, H. J. Li, M. Ye, L. Zotti, L. Zhang, Jiajun Zheng, Y. T. Gu, Zhi Zeng, N. Yu. Muchnoi, H. Cai, D. X. Lin, Y. H. Guan, R. A. Briere, A. Julin, Kai Wang, Y. Xia, F. Y. Li, S. L. Olsen, Z. Liu, B. Zheng, Zheng Wang, Guo-Ming Chen, J. Z. Bai, F. Feldbauer, Shujun Zhao, H. L. Dai, Z. T. Sun, C. P. Shen, Yong Liu, D. Bettoni, D. Y. Wang, Y. Zeng, R. Farinelli, G. F. Xu, Xuan Zhang, Jie Liu, H. Y. Sheng, Wang Zengqiang, Niu Xiaoyang, Z. Jiao, C. L. Luo, Cen Zhang, S. X. Du, Y. P. Lu, Y. N. Zhang, Fabrizio Bianchi, Zhengguo Zhao, Michela Greco, Guangyu Zhao, J. W. Zhao, Jie Zhao, S. Z. Chen, Changjian Tang, S. Ahmed, Y. X. Yang, Jie Zhang, Jia Xu, H. X. Yang, V. Prasad, L. Y. Dong, M. G. Zhao, Xianglei Zhu, R. Baldini Ferroli, F. H. Heinsius, J. F. Chang, X. K. Zhou, Wenbiao Yan, Ming Qi, Xian Gao, P. Wang, S. Marcello, J.H. Yin, G. F. Cao, A. Yuncu, D. M. Li, Haiwen Liu, J. F. Sun, Yongke Zhao, R. Poling, B. Zhong, L. B. Guo, D. H. Wei, E. Fioravanti, Y. G. Xie, Jia-ju Zhang, Yunpeng Lu, X. P. Xu, K. Schoenning, Q. Y. Li, Jiemin Li, T. Luo, Y. Zhang, B. Wang, Y. Z. Sun, Junguang Lu, X. R. Zhou, Cheng Li, Yuanbo Chen, Jingzhou Fan, T. Held, Niklaus Berger, A. Hafner, J. G. Messchendorp, T. Ma, Dmitri Dedovich, Q. L. Xiu, M. Pelizaeus, G. X. Sun, Z. P. Mao, I. Uman, Xiang Li, A. Calcaterra, L. L. Wang, Xiang Zhou, S. B. Liu, B. Kloss, X. S. Qin, Cunming Liu, Y. Guo, G. R. Liao, X. Y. Shen, Jingzhou Zhao, X. W. Tang, B. Kopf, I. B. Nikolaev, Ding-Xiong Wang, Ye-Fei Yuan, B. X. Zhang, M. Bertani, Minglin Ma, S. L. Niu, M. Kornicer, Z. Y. You, J. S. Huang, Hong Ma, R. E. Mitchell, L. Yang, F. F. An, I. Denysenko, Q. A. Malik, Z. Y. Deng, J. Liu, H. H. Liu, M. Fritsch, C. Dong, Y. H. Yan, O. Albayrak, Zhenyu Zhang, B. J. Liu, L. G. Xia, Tiefu Zhao, S. Sosio, H. Y. Zhang, Wu Li, Jianhao Zhang, Tao Hu, Joachim Pettersson, Meng Wang, Jia Liu, M. Destefanis, X. S. Kang, Chang-Zheng Yuan, Y. J. Mo, Cunfeng Feng, D. H. Zhang, G. Mezzadri, W. C. Yan, F. E. Maas, L. Q. Qin, L. Fava, Zhanwen Zhu, Y. F. Liang, X. L. Li, H. S. Chen, M. Ripka, T. Weber, Y. Ding, N. Qin, P. L. Liu, Chen Hu, Z. L. Hou, X. L. Luo, X. K. Chu, H. J. Lu, B. Y. Zhang, C. Morales Morales, Feng Liu, Ling Zhao, O. Bakina, X. S. Jiang, Kanglin He, Zhao-Long Wang, Z. Gao, Ch. Rosner, I. Garzia, Jianyu Zhang, L. H. Wu, P. X. Shen, Ka-Yuet Liu, P. Musiol, L. W. Jiang, C. F. Redmer, C. Schnier, Zhiqing Zhang, W. Gradl, M. Ablikim, Yu Zhang, A. A. Zafar, J. M. Zhang, S. Han, M. Savrie, J. M. Bian, Y.N. Gao, L. Xia, Jianbei Liu, Lei Xu, W. Shan, Dan Bennett, N. Kalantar-Nayestanaki, Jianguo Zhang, Yi Fang, Y. Q. Wang, K. H. Rashid, U. Wiedner, Qingnian Xu, Qiang Zhao, S. Nisar, Y. Hu, Kai Liu, Xin Fang, H. B. Liu, X. L. Kang, D. Xiao, Q. W. Zhao, M. H. Ye, X. Y. Jiang, Yun-Zhi Zhang, P. Weidenkaff, L. D. Liu, P. R. Li, J. L. Ping, Zahra Haddadi, W. J. Zheng, Y. Nefedov, F. Nerling, Y. Pan, J. Chai, X. Z. Cai, R. P. Guo, W. Ikegami Andersson, Tord Johansson, F. De Mori, Fu-Hu Liu, Y. J. Sun, Z. J. Sun, Y. P. Guo, Y. S. Zhu, Y. B. Liu, Gang Li, G. S. Varner, G. A. Chelkov, Z. H. Qin, Talib Hussain, Yanwei Wang, Li Zhou, Z. L. Dou, D. P. Jin, Xiao-Rui Lyu, X. Y. Ma, M. Y. Dong, Qingming Ma, Kai Zhu, Z. L. Huang, J. C. Chen, S. Qian, Xiang Liu, Xiaoyu Li, Jiaheng Zou, Chunxu Yu, T. J. Min, L. J. Wu, P. Larin, Krisztian Peters, J. F. Hu, Y. Ma, S. Spataro, Jianbin Jiao, B. X. Yu, K. Goetzen, I. Boyko, H. P. Peng, H. M. Hu, I. Tapan, W. F. Wang, H. Xiao, E. Boger, Xinying Song, D. J. Ambrose, Xiaocong Ai, X. R. Chen, M. Albrecht, Cui Li, and P. Patteri
Subjects: Nuclear physics, Physics, Cross section (physics), 010308 nuclear & particles physics, 0103 physical sciences, General Physics and Astronomy, Sigma, Center of mass, 010306 general physics, 01 natural sciences, Resonance (particle physics), Belle experiment, Storage ring
Abstract: The cross section for the process e(+)e(-)-> pi(+) pi(-) J/psi is measured precisely at center-of-mass energies from 3.77 to 4.60 GeV using 9 fb(-1) of data collected with the BESIII detector operating at the BEPCII storage ring. Two resonant structures are observed in a fit to the cross section. The first resonance has a mass of (222.0 +/- 3.1 +/- 1.4) MeV/ c(2) and a width of (44.1 +/- 4.3 +/- 2.0)MeV, while the second one has a mass of (4320.0 +/- 10.4 +/- 7.0)MeV/c(2) and a width of (101.4(- 19.7)(+25.3) +/- 10.2) MeV, where the first errors are statistical and second ones are systematic. The first resonance agrees with the Y(4260) resonance reported by previous experiments. The precision of its resonant parameters is improved significantly. The second resonance is observed in e(+)e(-)-> pi(+) pi(-) J/psi for the first time. The statistical significance of this resonance is estimated to be larger than 7.6 sigma. The mass and width of the second resonance agree with the Y(4360) resonance reported by the BABAR and Belle experiments within errors. Finally, the Y(4008) resonance previously observed by the Belle experiment is not confirmed in the description of the BESIII data.
Published: 2017

250. Evidence of Two Resonant Structures in e+e−→π+π−hc

Author: E. H. Thorndike, P. L. Wang, L. Q. Qin, I. Tapan, Y. H. Yan, J. W. Zhao, X. L. Luo, A. Calcaterra, H. J. Lu, J. G. Lu, X. L. Gao, F. E. Maas, F. De Mori, Y. X. Xia, S. H. Zhu, J. M. Bian, S. J. Zhao, R. Farinelli, L. Zotti, J. Z. Bai, F. Feldbauer, T. Hu, Y. C. Zhu, W. P. Wang, J. F. Chang, A. Q. Guo, W. M. Song, Y. B. Zhao, K. Li, X. K. Zhou, Fang Liu, Q. J. Xu, R. Baldini Ferroli, C. Dong, Tao Luo, S. Sosio, O. Bakina, B. X. Yu, Zhi Zeng, H. Cai, H. L. Ma, D. M. Li, Igor Boyko, G. Cibinetto, Magnus Wolke, Xuanhong Lou, X. C. Chen, H. Xiao, E. Boger, X. B. Ji, W. Shan, J. Dong, I. Denysenko, X. N. Li, Haiping Peng, J. H. Liu, A. Dbeyssi, Y. F. Liang, Ke Wang, Nasser Kalantar-Nayestanaki, H. Liang, X. Y. Zhou, P. F. Duan, B. L. Wang, T. C. Zhao, Guangshun Huang, L. Yan, Yao Wang, L. J. Wu, D. P. Jin, C. Morales Morales, T. Held, P. Patteri, Joachim Pettersson, Y. Q. Wang, Z. H. Qin, Z. Ning, P. X. Shen, R. Poling, M. Pelizaeus, H. L. Dai, Jin Li, F. Li, Y. J. Mo, S. Nisar, C. J. Tang, B. Y. Zhang, Z. Wu, L. W. Jiang, Y. H. Guan, Gueorgui Chelkov, Jie Zhao, D. X. Lin, J. F. Sun, T. Holtmann, R. Kliemt, Alexey Zhemchugov, H. M. Hu, Y. Hu, C. Hu, Y. P. Lu, F. C. Ma, J. Y. Liu, Dayong Wang, N. Qin, M. Qi, X. Tang, Zhiqing Zhang, D. J. Ambrose, M. G. Zhao, W. G. Li, Q An, Jie Yu, A. Yuncu, J. W. Zhang, B. Wang, R. P. Guo, H. J. Yang, Y. N. Zhang, H. S. Chen, T. Weber, Xiaozhong Huang, S. Marcello, Zhiqing Liu, Xiao-Rui Lyu, X. F. Wang, Q. P. Ji, Kai Liu, Y. Zeng, S. Spataro, I. Uman, D. Xiao, Guo-Ming Chen, Q. Gao, Y. N. Gao, T. Johansson, Y. Zhang, X. Y. Jiang, C. Leng, Z. G. Wang, X. P. Xu, Y. Y. Liu, H. Y. Zhang, Q. M. Ma, Q. Ouyang, Lei Li, O. B. Kolcu, Y. H. Zheng, T. J. Min, K. J. Zhu, P. Larin, M. M. Ma, J. C. Chen, Cong-Feng Qiao, O. Albayrak, Yuehong Xie, J. Z. Fan, J. F. Qiu, S. S. Fang, L. Lavezzi, Yaquan Fang, X. Fang, S. Z. Chen, W. D. Li, H. M. Liu, L. Fava, X. Q. Hao, N. Yu. Muchnoi, B. Kloss, Y. B. Liu, Zahra Haddadi, Andrzej Kupsc, Liqing Xu, X. Y. Shen, Z. L. Huang, G. S. Varner, Feng Liu, X. Y. Niu, Bibo Ke, W. B. Yan, X. S. Kang, Y. J. Mao, Y. H. Zhang, Yunlong Zhang, J. Y. Zhang, Y. Pan, G. Felici, S. Ahmed, Y. X. Yang, J. Chai, H. X. Yang, Y. Ding, Y. Yuan, Y. S. Zhu, M. Bertani, Yu Zhang, J. Q. Zhang, I. Garzia, Xiaofeng Zhu, J. Z. Zhang, J. L. Zhang, G. X. Sun, S. Pacetti, Z. Jiao, Fu-Hu Liu, D. H. Zhang, B. J. Liu, D. Bettoni, Bingxuan Liu, K. Schoenning, Q. Y. Li, B. S. Zou, M. Maggiora, Ling Zhao, Jianping Zheng, S. Zhu, Lei Zhao, Z. Y. Wang, A. Hafner, J. P. Liu, Z. L. Hou, H. J. Li, G. Li, X. N. Ma, W. Kühn, Q. Zhao, Dmitri Dedovich, Y. Z. Sun, X. L. Ji, Q. Liu, Y. Nefedov, X. D. Ruan, Niklaus Berger, Q. A. Malik, G. Mezzadri, W. C. Yan, Yi Chen, X. K. Chu, M. Y. Dong, Q. L. Xiu, Xiang Zhou, J. J. Zhang, J. G. Messchendorp, Z. Y. You, Z. A. Zhu, Y. K. Heng, Jun-Yi Zhang, Y. P. Guo, L. L. Ma, M. Tiemens, Z. P. Zhang, H. B. Liu, M. Ablikim, M. Destefanis, J. H. Zou, Z. J. Xiao, Y. Ban, M. Fritsch, L. Gong, Qiunan Xu, Gang Zhao, L. G. Xia, C. D. Fu, D. W. Bennett, Zujian Wang, L. P. Zhou, C. Z. Yuan, M. Kavatsyuk, C. P. Shen, Krisztian Peters, X. Cai, S. S. Sun, Yanwei Wang, S. B. Liu, Y. M. Ma, M. N. Achasov, Z. P. Mao, F. F. An, C. Q. Feng, X. R. Chen, Y. G. Xie, F. A. Harris, J. Fang, Tao Li, L. Yang, B. X. Zhang, H. Leithoff, Z. Gao, M. Albrecht, S. X. Du, R. A. Briere, A. Julin, Z. L. Dou, Ch. Rosner, G. R. Liao, J. F. Hu, Cui Li, Xingguo Li, W. Gradl, R. E. Mitchell, M. Ripka, D. Y. Wang, J. Min, B. Kopf, K. L. He, M. Z. Wang, Jimin Zhao, S. Han, L. H. Wu, M. Savrie, K. Goetzen, L. Xia, Z. H. Wang, J. J. Xu, P. Musiol, C. F. Redmer, Xiaocong Ai, Y. B. Li, C. Schnier, X. T. Huang, J. S. Huang, C. X. Liu, G. Rong, X. Liu, H. R. Qi, A. A. Zafar, Serkant Ali Cetin, K. H. Rashid, G. F. Xu, D. Y. Liu, J. B. Jiao, Y. T. Liang, S. Q. Zhang, S. J. Chen, S. Jin, G. F. Cao, Y. Guo, S. Qian, Jialun Ping, A. Amoroso, K. Zhang, X. Y. Zhang, M. Lara, J. B. Liu, X. Y. Song, Y. J. Sun, J. P. Dai, Peilian Liu, Lingxuan Zhang, Z. G. Zhao, Zhiyong Zhang, I. B. Nikolaev, J. H. Yin, F. Bianchi, M. Shao, Y. T. Gu, H. H. Zhang, M. H. Gu, H. Y. Sheng, C. X. Yu, E. Fioravanti, Z. J. Sun, H. Loehner, B. Zheng, R. G. Ping, Z. T. Sun, X. L. Kang, A. Sarantsev, D. H. Wei, P. R. Li, Z. A. Liu, J. S. Lange, V. Prasad, P. Weidenkaff, Q. W. Zhao, M. H. Ye, F. H. Heinsius, S. P. Wen, X. S. Qin, X. R. Zhou, L. D. Liu, H. B. Li, L. Y. Dong, Cheng Li, C. L. Luo, W. J. Zheng, F. Nerling, C. C. Zhang, B. Zhong, L. B. Guo, X. H. Mo, L. S. Wang, L. L. Wang, H. Muramatsu, Ulrich Wiedner, M. Kornicer, T. Ma, Z. Y. Deng, H. H. Liu, J. C. Li, J. Zhuang, A. Denig, M. X. Luo, M. L. Chen, Y. F. Wang, J. V. Bennett, T. Hussain, X. Y. Ma, W. X. Gong, X. H. Sun, S. L. Niu, F. Y. Li, X. Q. Li, M. Greco, K. Y. Liu, Z. B. Li, W. Ikegami Andersson, Orhan Cakir, P. Kiese, S. L. Olsen, and X. S. Jiang
Subjects: Mass enhancement, Physics, Positron, 010308 nuclear & particles physics, Electron–positron annihilation, 0103 physical sciences, Analytical chemistry, Pi, General Physics and Astronomy, Electron, Atomic physics, 010306 general physics, 01 natural sciences
Abstract: The cross sections of e(+)e(-) -> pi(+) pi(-) hc at center-of-mass energies from 3.896 to 4.600 GeVare measured using data samples collected with the BESIII detector operating at the Beijing Electron Positron Collider. The cross sections are found to be of the same order of magnitude as those of e(+)e(-) -> pi(+) pi(-) J/psi and e(+)e(-) -> pi(+) pi(-) psi (2S), but the line shape is inconsistent with the Y states observed in the latter two modes. Two structures are observed in the e(+)e(-) -> pi(+) pi(-) hc cross sections around 4.22 and 4.39 GeV/c(2), which we call Y(4220)and Y(4390), respectively. A fit with a coherent sum of two Breit-Wigner functions results in a mass of (4218.4(- 4.5)(vertical bar 5.5) +/- 0.9) MeV/ c(2) and a width of (66.0(- 8.3)(vertical bar 12.3) +/- 0.4) MeV for the Y(4220), and a mass of (4391.5(- 6.8)(+6.3) +/- 1.0) MeV/c(2) and a width of (139.5(- 20.6)(+16.2) +/- 0.6) MeV for the Y(4390), where the first uncertainties are statistical and the second ones systematic. The statistical significance of Y(4220) and Y(4390) is 10 sigma over one structure assumption.
Published: 2017

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