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27 results on '"electroproduction [J/psi(3100)]"'

1. Measurement of branching fractions of $J/��$ and $��(3686)$ decays to $��^+$ and $ \bar{\Sigma}^{��}$

Author: Ablikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, X. H., Bai, Y., Bakina, O., Baldini Ferroli, R., Balossino, I., Ban, Y., Begzsuren, K., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Bloms, J., Bortone, A., Boyko, I., Briere, R. A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cao, N., Cetin, S. A., Chang, J. F., Chang, W. L., Chelkov, G., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chen, Z. J., Cheng, W. S., Cibinetto, G., Cossio, F., Cui, X. F., Dai, H. L., Dai, J. P., Dai, X. C., Dbeyssi, A., De Boer, R. E., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, S. X., Fan, Y. L., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Feng, J. H., Fritsch, M., Fu, C. D., Gao, Y., Garzia, I., Ge, P. T., Geng, C., Gersabeck, E. M., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, L. M., Gu, M. H., Gu, Y. T., Guan, C. Y, Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Han, T. T., Han, W. Y., Hao, X. Q., Harris, F. A., He, K. L., Heinsius, F. H., Heinz, C. H., Heng, Y. K., Herold, C., Himmelreich, M., Holtmann, T., Hou, G. Y., Hou, Y. R., Hou, Z. L., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, L. Q., Huang, X. T., Huang, Y. P., Huang, Z., Hussain, T., H��sken, N., Ikegami Andersson, W., Imoehl, W., Irshad, M., Jaeger, S., Janchiv, S., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Ji, Y. Y., Jiang, H. B., Jiang, X. S., Jiao, J. B., Jiao, Z., Jin, S., Jin, Y., Jing, M. Q., Johansson, T., Kalantar-Nayestanaki, N., Kang, X. S., Kappert, R., Kavatsyuk, M., Ke, B. C., Keshk, I. K., Khoukaz, A., Kiese, P., Kiuchi, R., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kuemmel, M., Kuessner, M., Kupsc, A., Kurth, M. G., K��hn, W., Lane, J. J., Lange, J. S., Larin, P., Lavania, A., Lavezzi, L., Lei, Z. H., Leithoff, H., Lellmann, M., Lenz, T., Li, C., Li, C. H., Li, Cheng, Li, D. M., Li, F., Li, G., Li, H., Li, H. B., Li, H. J., Li, J. L., Li, J. Q., Li, J. S., Li, Ke, Li, L. K., Li, Lei, Li, P. R., Li, S. Y., Li, W. D., Li, W. G., Li, X. H., Li, X. L., Li, Xiaoyu, Li, Z. Y., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Limphirat, A., Lin, C. X., Lin, T., 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. L., Liu, J. Y., Liu, K., Liu, K. Y., Liu, L., Liu, M. H., Liu, P. L., Liu, Q., Liu, S. B., Liu, Shuai, Liu, T., Liu, W. M., Liu, X., Liu, Y., Liu, Y. B., Liu, Z. A., Liu, Z. Q., Lou, X. C., Lu, F. X., Lu, H. J., Lu, J. D., Lu, J. G., Lu, X. L., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, P. W., Luo, T., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, R. Q., Ma, R. T., Ma, X. X., Ma, X. Y., Ma, Y., Maas, F. E., Maggiora, M., Maldaner, S., Malde, S., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, T. J., Mitchell, R. E., Mo, X. H., Muchnoi, N. Yu., Muramatsu, H., Nakhoul, S., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, X., Pan, Y., Pathak, A., Patteri, P., Pelizaeus, M., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Pogodin, S., Poling, R., Prasad, V., Qi, H., Qi, H. R., Qi, K. H., Qi, M., Qi, T. Y., Qian, S., Qian, W. B., Qian, Z., Qiao, C. F., Qin, L. Q., Qin, X. P., Qin, X. S., Qin, Z. H., Qiu, J. F., Qu, S. Q., Rashid, K. H., Ravindran, K., Redmer, C. F., Rivetti, A., Rodin, V., Rolo, M., Rong, G., Rosner, Ch., Rump, M., Sang, H. S., Sarantsev, A., Schelhaas, Y., Schnier, C., Schoenning, K., Scodeggio, M., Shan, D. C., Shan, W., Shan, X. Y., Shangguan, J. F., Shao, M., Shen, C. P., Shen, H. F., Shen, P. X., Shen, X. Y., Shi, H. C., Shi, R. S., Shi, X., Shi, X. D, Song, W. M., Song, Y. X., Sosio, S., Spataro, S., Su, K. X., Su, P. P., Sun, G. X., Sun, H. K., Sun, J. F., Sun, L., Sun, S. S., Sun, T., Sun, W. Y., Sun, X., Sun, Y. J., Sun, Y. Z., Sun, Z. T., Tan, Y. H., Tan, Y. X., Tang, C. J., Tang, G. Y., Tang, J., Teng, J. X., Thoren, V., Tian, W. H., Tian, Y. T., Uman, I., Wang, B., Wang, C. W., Wang, D. Y., Wang, H. J., Wang, H. P., Wang, K., Wang, L. L., Wang, M., Wang, M. Z., Wang, Meng, Wang, S., Wang, W., Wang, W. H., Wang, W. P., Wang, X., Wang, X. F., Wang, X. L., Wang, Y., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Y. Y., Wang, Z., Wang, Z. Y., Wang, Ziyi, Wang, Zongyuan, Wei, D. H., Weidner, F., Wen, S. P., White, D. J., Wiedner, U., Wilkinson, G., Wolke, M., Wollenberg, L., Wu, J. F., Wu, L. H., Wu, L. J., Wu, X., Wu, Z., Xia, L., Xiang, T., Xiao, H., Xiao, S. Y., Xiao, Z. J., Xie, X. H., Xie, Y. G., Xie, Y. H., Xing, T. Y., Xu, C. J., Xu, G. F., Xu, Q. J., Xu, W., Xu, X. P., Xu, Y. C., Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yan, Xu, Yang, H. J., Yang, H. X., Yang, L., Yang, S. L., Yang, Y. X., Yang, Yifan, Yang, Zhi, Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, G., Yu, J. S., Yu, T., Yuan, C. Z., Yuan, L., Yuan, X. Q., Yuan, Y., Yuan, Z. Y., Yue, C. X., Zafar, A. A., Zeng Zeng, X., Zeng, Y., Zhang, A. Q., Zhang, B. X., Zhang, G. Y., Zhang, H., Zhang, H. H., Zhang, H. Y., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, Jianyu, Zhang, Jiawei, Zhang, L. M., Zhang, L. Q., Zhang, Lei, Zhang, S., Zhang, S. F., Zhang, Shulei, Zhang, X. D., Zhang, X. Y., Zhang, Y., Zhang, Y. T., Zhang, Y. H., Zhang, Yan, Zhang, Yao, Zhang, Z. Y., Zhao, G., Zhao, J., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, Y. B., Zhao, Y. X., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhong, C., Zhou, L. P., Zhou, Q., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, A. N., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S. H., Zhu, T. J., Zhu, W. J., Zhu, Y. C., Zhu, Z. A., Zou, B. S., and Zou, J. H.
Subjects: BES, +Sigma%2B+Sigma%22">psi(3685) --> Sigma+ Sigma, electroproduction [psi(3685)], branching ratio: measured [psi(3685)], e+-e− Experiments, hadronic decay [J/psi(3100)], annihilation [electron positron], Beijing Stor, QCD, electroproduction [J/psi(3100)], branching ratio: measured [J/psi(3100)], +Sigma%2B+Sigma%22">J/psi(3100) --> Sigma+ Sigma, colliding beams [electron positron], ddc:530, Branching fraction, ratio: measured [branching ratio], hadronic decay [psi(3685)], pair production [Sigma], experimental results
Abstract: Journal of high energy physics 2021(11), 226 (2021). doi:10.1007/JHEP11(2021)226, Published by SISSA, [Trieste]
Published: 2021
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2. Measurement of the cross-section ratio σ ψ(2S) / σ J/ψ(1S) in deep inelastic exclusive ep scattering at HERA

Author: Matthew Wing, P. Roloff, N. Kovalchuk, B. B. Levchenko, F. Corriveau, G. Grzelak, E.G. Boos, I.O. Skillicorn, Takuya Nobe, I. Abt, A. Kotański, T. Tsurugai, W. A. T. Wan Abdullah, F. Januschek, I. Kadenko, R. Brugnera, Sebastian Mergelmeyer, Marco Schioppa, Yu.O. Shyrma, Kerstin Borras, Achim Geiser, Ie. Korol, E. Lobodzinska, N. Z. Jomhari, A. Garfagnini, Marcella Capua, L. M. Shcheglova, W. Hain, Leszek Adamczyk, R. Ciesielski, A. M. Cooper-Sarkar, I. A. Korzhavina, Andrii Gizhko, Ada Solano, U. Karshon, S. Antonelli, Yu. Onishchuk, O. Yu. Lukina, Ganna Dolinska, Thomas Schörner-Sadenius, Y. Yamazaki, Yu. A. Golubkov, D. Szuba, N.S. Pokrovskiy, L. Stanco, S. Limentani, R. Shevchenko, A. Longhin, E. Paul, D.H. Saxon, O. Kononenko, Katsuo Tokushuku, A. Bruni, M. Turcato, I. Singh, E. Lohrmann, F. Mohamad Idris, K. Nagano, O. Turkot, P. Stopa, Janusz Chwastowski, R. Klanner, Enrico Tassi, U. Klein, V. Aushev, O. Zenaiev, B. Foster, S. Dusini, K. Wichmann, M. Adamus, W. Słomiński, Ulf Behrens, H. Kowalski, J. Grebenyuk, D. Lontkovskyi, I. Gregor, Mariusz Przybycien, M. Corradi, O. Viazlo, I. Makarenko, Allen Caldwell, L. K. Gladilin, R. K. Dementiev, Y. Iga, N. Kondrashova, Zainol Abidin Ibrahim, A. Bertolin, R.C.E. Devenish, T. Tymieniecka, S. Kananov, U. Kötz, L. Zawiejski, B. Löhr, V. Myronenko, R. J. Nowak, W. Perlanski, P. Kaur, B.O. Zhautykov, Masaki Ishitsuka, J. Tomaszewska, O. Kuprash, Jan Figiel, J. Ciborowski, N. Stefaniuk, A. Iudin, Manjit Kaur, N. Mohammad Nasir, M. Lisovyi, J. Malka, Roman Walczak, Halina Abramowicz, I. Rubinsky, Ingo Bloch, A. Trofymov, D. Notz, D.S. Zotkin, C. D. Catterall, O. Shkola, N. Zhmak, Gy. Wolf, B. Krupa, J. Szuba, S. Yamada, Marcin Pawel Guzik, U. Schneekloth, M. Kuze, Grzegorz Gach, Olaf Behnke, Vladyslav Libov, J. Sztuk-Dambietz, Ian Brock, D. Hochman, R. Hori, Y. Aushev, E. Gallo, Danuta Kisielewska, N. Zakharchuk, Orel Gueta, Andrii Verbytskyi, Marta Ruspa, Aharon Levy, Aleksander Filip Żarnecki, N. H. Brook, Peter Bussey, A. Stern, and W. B. Schmidke
Subjects: exclusive reaction, Nuclear and High Energy Physics, Particle physics, Photon, Proton, HERA, FOS: Physical sciences, HERA, ZEUS, Deep inelastic scattering, Psi meson production, 01 natural sciences, 7. Clean energy, decay modes, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), deep inelastic scattering, quantum chromodynamics, 0103 physical sciences, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, ddc:530, Nuclear Experiment, 010306 general physics, Physics, ZEUS (particle detector), Luminosity (scattering theory), production [vector meson], 010308 nuclear & particles physics, Scattering, electroproduction [psi(3685)], photon, ZEUS, scattering [electron p], Deep inelastic scattering, electroproduction [J/psi(3100)], DESY HERA Stor, Psi meson production, kinematics, Vertex (curve), lcsh:QC770-798, High Energy Physics::Experiment, ratio [cross section], experimental results
Abstract: The exclusive deep inelastic electroproduction of $\psi(2S)$ and $J/\psi(1S)$ at an $ep$ centre-of-mass energy of 317 GeV has been studied with the ZEUS detector at HERA in the kinematic range $2 < Q^2 < 80$ GeV$^2$, $30 < W < 210$ GeV and $|t| < 1$ GeV$^2$, where $Q^2$ is the photon virtuality, $W$ is the photon-proton centre-of-mass energy and $t$ is the squared four-momentum transfer at the proton vertex. The data for $2 < Q^2 < 5$ GeV$^2$ were taken in the HERA I running period and correspond to an integrated luminosity of 114 pb$^{-1}$. The data for $5 < Q^2 < 80$ GeV$^2$ are from both HERA I and HERA II periods and correspond to an integrated luminosity of 468 pb$^{-1}$. The decay modes analysed were $\mu^+\mu^-$ and $J/\psi(1S) \,\pi^+\pi^-$ for the $\psi(2S)$ and $\mu^+\mu^-$ for the $J/\psi(1S)$. The cross-section ratio $\sigma_{\psi(2S)}/\sigma_{J/\psi(1S)}$ has been measured as a function of $Q^2, W$ and $t$. The results are compared to predictions of QCD-inspired models of exclusive vector-meson production., Comment: 24 pages, 8 figures
Published: 2016
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3. Study of the Dalitz decay $J/\psi \to e^+e^- \eta$

Author: BESIII Collaboration, Ablikim, M., Achasov, M. N., Adlarson, P., Ahmed, S., Albrecht, M., Aliberti, R., Amoroso, A., An, M. R., An, Q., Bai, X. H., Bai, Y., Bakina, O., Ferroli, R. Baldini, Balossino, I., Ban, Y., Begzsuren, K., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Bloms, J., Bortone, A., Boyko, I., Briere, R. A., Brueggemann, A., Cai, H., Cai, X., Calcaterra, A., Cao, G. F., Cao, N., Cetin, S. A., Chang, J. F., Chang, W. L., Chelkov, G., Chen, G., Chen, H. S., Chen, M. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chen, Z. J., Cheng, W. S., Cibinetto, G., Cossio, F., Cui, J. J., Cui, X. F., Dai, H. L., Dai, J. P., Dai, X. C., Dbeyssi, A., de Boer, R. E., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dong, X., Du, S. X., Egorov, P., Fan, Y. L., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Feldbauer, F., Felici, G., Feng, C. Q., Feng, J. H., Fritsch, M., Fu, C. D., Gao, Y. N., Gao, Yang, Garzia, I., Ge, P. T., Geng, C., Gersabeck, E. M., Gilman, A, Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, L. M., Gu, M. H., Guan, C. Y, Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y. P., Guskov, A., Han, T. T., Han, W. Y., Hao, X. Q., Harris, F. A., He, K. K., He, K. L., Heinsius, F. H., Heinz, C. H., Heng, Y. K., Herold, C., Himmelreich, M., Holtmann, T., Hou, G. Y., Hou, Y. R., Hou, Z. L., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, L. Q., Huang, X. T., Huang, Y. P., Huang, Z., Hussain, T., Hüsken, N, Andersson, W. Ikegami, Imoehl, W., Irshad, M., Jaeger, S., Janchiv, S., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Ji, Y. Y., Jiang, H. B., Jiang, X. S., Jiao, J. B., Jiao, Z., Jin, S., Jin, Y., Jing, M. Q., Johansson, T., Kalantar-Nayestanaki, N., Kang, X. S., Kappert, R., Kavatsyuk, M., Ke, B. C., Keshk, I. K., Khoukaz, A., Kiese, P., Kiuchi, R., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kuemmel, M., Kuessner, M., Kupsc, A., Kurth, M. G., Kühn, W., Lane, J. J., Lange, J. S., Larin, P., Lavania, A., Lavezzi, L., Lei, Z. H., Leithoff, H., Lellmann, M., Lenz, T., Li, C., Li, C. H., Li, Cheng, Li, D. M., Li, F., Li, G., Li, H., Li, H. B., Li, H. J., Li, H. N., Li, J. L., Li, J. Q., Li, J. S., Li, Ke, Li, L. K., Li, Lei, Li, P. R., Li, S. Y., Li, T., Li, W. D., Li, W. G., Li, X. H., Li, X. L., Li, Xiaoyu, Li, Z. Y., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Limphirat, A., Lin, C. X., Lin, D. X., Lin, T., Liu, B. J., Liu, C. X., Liu, D., Liu, F. H., Liu, Fang, Liu, Feng, Liu, G. M., Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. L., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L., Liu, M. H., Liu, P. L., Liu, Q., Liu, S. B., Liu, T., Liu, W. M., Liu, X., Liu, Y., Liu, Y. B., Liu, Z. A., Liu, Z. Q., Lou, X. C., Lu, F. X., Lu, H. J., Lu, J. D., Lu, J. G., Lu, X. L., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lyu, X. R., Ma, F. C., Ma, H. L., Ma, L. L., Ma, M. M., Ma, Q. M., Ma, R. Q., Ma, R. T., Ma, X. X., Ma, X. Y., Ma, Y., Maas, F. E., Maggiora, M., Maldaner, S., Malde, S., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, T. J., Mitchell, R. E., Mo, X. H., Muchnoi, N. Yu., Muramatsu, H., Nakhoul, S., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, X., Pan, Y., Pathak, A., Patteri, P., Pelizaeus, M., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Plura, S., Pogodin, S., Poling, R., Prasad, V., Qi, H., Qi, H. R., Qi, M., Qi, T. Y., Qian, S., Qian, W. B., Qian, Z., Qiao, C. F., Qin, J. J., Qin, L. Q., Qin, X. P., Qin, X. S., Qin, Z. H., Qiu, J. F., Qu, S. Q., Rashid, K. H., Ravindran, K., Redmer, C. F., Rivetti, A., Rodin, V., Rolo, M., Rong, G., Rosner, Ch., Rump, M., Sang, H. S., Sarantsev, A., Schelhaas, Y., Schnier, C., Schoenning, K., Scodeggio, M., Shan, W., Shan, X. Y., Shangguan, J. F., Shao, M., Shen, C. P., Shen, H. F., Shen, X. Y., Shi, H. C., Shi, R. S., Shi, X., Shi, X. D, Song, J. J., Song, W. M., Song, Y. X., Sosio, S., Spataro, S., Stieler, F., Su, K. X., Su, P. P., Sun, G. X., Sun, H. K., Sun, J. F., Sun, L., Sun, S. S., Sun, T., Sun, W. Y., Sun, X, Sun, Y. J., Sun, Y. Z., Sun, Z. T., Tan, Y. H., Tan, Y. X., Tang, C. J., Tang, G. Y., Tang, J., Teng, J. X., Thoren, V., Tian, W. H., Tian, Y. T., Uman, I., Wang, B., Wang, C. W., Wang, D. Y., Wang, H. J., Wang, H. P., Wang, K., Wang, L. L., Wang, M., Wang, M. Z., Wang, Meng, Wang, S., Wang, W., Wang, W. H., Wang, W. P., Wang, X., Wang, X. F., Wang, X. L., Wang, Y. D., Wang, Y. F., Wang, Y. Q., Wang, Y. Y., Wang, Ying, Wang, Z., Wang, Z. Y., Wang, Ziyi, Wang, Zongyuan, Wei, D. H., Weidner, F., Wen, S. P., White, D. J., Wiedner, U., Wilkinson, G., Wolke, M., Wollenberg, L., Wu, J. F., Wu, L. H., Wu, L. J., Wu, X., Wu, X. H., Wu, Z., Xia, L., Xiang, T., Xiao, H., Xiao, S. Y., Xiao, Z. J., Xie, X. H., Xie, Y. G., Xie, Y. H., Xing, T. Y., Xu, C. J., Xu, G. F., Xu, Q. J., Xu, S. Y., Xu, W., Xu, X. P., Xu, Y. C., Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yang, H. J., Yang, H. X., Yang, L., Yang, S. L., Yang, Yifan, Yang, Zhi, Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, G., Yu, J. S., Yu, T., Yuan, C. Z., Yuan, L., Yuan, X. Q., Yuan, Y., Yuan, Z. Y., Yue, C. X., Zafar, A. A., Zeng, X. Zeng, Zeng, Y., Zhang, A. Q., Zhang, B. X., Zhang, G. Y., Zhang, H., Zhang, H. H., Zhang, H. Y., Zhang, J. L., Zhang, J. Q., Zhang, J. W., Zhang, J. Y., Zhang, J. Z., Zhang, Jianyu, Zhang, Jiawei, Zhang, L. M., Zhang, L. Q., Zhang, Lei, Zhang, S. F., Zhang, Shulei, Zhang, X. D., Zhang, X. Y., Zhang, Y., Zhang, Y. T., Zhang, Y. H., Zhang, Yan, Zhang, Yao, Zhang, Z. Y., Zhao, G., Zhao, J., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, S. J., Zhao, Y. B., Zhao, Y. X., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhong, C., Zhou, L. P., Zhou, Q., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, A. N., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S. H., Zhu, T. J., Zhu, W. J., Zhu, Y. C., Zhu, Z. A., Zou, B. S., and Zou, J. H.
Subjects: +electron+positron+eta%22">J/psi(3100) --> electron positron eta, hidden sector [gauge boson], branching ratio: upper limit, +2photon%22">eta --> 2photon, +pi%2B+pi-+pi0%22">eta --> pi+ pi- pi0, annihilation [electron positron], 4/3, gauge boson: hidden sector, High Energy Physics - Experiment, electron: pair production, gauge boson: leptonic decay, transition [form factor], Nuclear Experiment, mass: pole, electron positron: colliding beams, Beijing Stor, J/psi(3100): semileptonic decay, (electron positron) [mass spectrum], mass dependence, eta: decay modes, electroproduction [J/psi(3100)], colliding beams [electron positron], photon: pair production, mixing: kinetic, pair production [photon], decay modes [eta], hadronic decay [eta], electron positron: annihilation, radiative decay [eta], mass spectrum: (electron positron), ddc:530, hidden sector [photon], kinetic [mixing], pair production [electron], J/psi(3100): electroproduction, eta: hadronic decay, form factor: transition, photon: hidden sector, eta: radiative decay, BES, semileptonic decay [J/psi(3100)], leptonic decay [gauge boson], electromagnetic, upper limit [branching ratio], High Energy Physics::Experiment, pole [mass], experimental results
Abstract: We report corrected results on a study of the electromagnetic Dalitz decay $J/\psi \to e^+e^- \eta$ and search for di-electron decays of a light dark gauge boson ($\gamma'$) in $J/\psi \to \gamma' \eta$ with the two $\eta$ decay modes $\eta \rightarrow \gamma \gamma$ and $\eta \rightarrow \pi^+\pi^-\pi^0$, using $(1310.6\pm 7.0)\times10^6$ $J/\psi$ events collected with the BESIII detector. In particular we update the measurement of the pole mass of the transition form factor (TFF) of $J/\psi \to e^+e^- \eta$ to be $\Lambda = 2.56 \pm 0.04({\rm stat}) \pm 0.03({\rm syst})$ GeV/$c^2$. The branching fraction of $J/\psi \to e^+e^-\eta$ and the kinetic-mixing strength between the Standard Model photon and $\gamma'$ are also updated after taking the corrected $\Lambda$ value into account. The measured branching fraction of $J/\psi \to e^+e^- \eta$ is updated to be $(1.42 \pm 0.04({\rm stat}) \pm 0.07 ({\rm syst}))\times 10^{-5}$, where the first and second uncertainties are statistical and systematic, respectively., Comment: 6 pages, 3 figures, Erratum of Phys. Rev. D 99, 012006 (2019)
Published: 2019
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4. Measurement of $\mathcal{B}(J/\psi \to \eta' e^+ e^-)$ and search for a dark photon

Author: Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Alekseev, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Ferroli, R. Baldini, Ban, Y., Begzsuren, K., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Cheng, W., Chu, X. K., Cibinetto, G., Cossio, F., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garillon, B., Garzia, I., Gilman, A., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guo, A. Q., Guo, R. P., Guo, Y. P., Guskov, A., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Z. L., Hussain, T., Andersson, W. Ikegami, Irshad, M., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Jin, Y., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. S., Kavatsyuk, M., Ke, B. C., Khan, T., Khoukaz, A., Kiese, P., Kiuchi, R., Kliemt, R., Koch, L., Kolcu, O. B., Kopf, B., Kornicer, M., Kuemmel, M., Kuessner, M., Kupsc, A., Kurth, M., Kühn, W., Lange, J. S., Lara, M., Larin, P., Lavezzi, L., Leithoff, H., Li, 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, 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., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Liao, L. Z., Libby, J., Lin, C. X., Lin, D. X., Liu, B., Liu, B. J., Liu, C. X., Liu, D., Liu, D. Y., Liu, F. H., Liu, Fang, Liu, Feng, Liu, H. B., Liu, H. L, Liu, H. M., Liu, Huanhuan, Liu, Huihui, Liu, J. B., Liu, J. Y., Liu, K., Liu, K. Y., Liu, Ke, Liu, L. D., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Z. A., Liu, Zhiqing, Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, X. L., Lusso, S., Lyu, X. R., Ma, 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., Maas, F. E., Maggiora, M., Malik, Q. A., Mangoni, A., Mao, Y. J., Mao, Z. P., Marcello, S., Meng, Z. X., Messchendorp, J. G., Mezzadri, G., Min, J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Muchnoi, N. Yu., Muramatsu, H., Mustafa, A., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Papenbrock, M., Patteri, P., Pelizaeus, M., Pellegrino, J., Peng, H. P., Peng, Z. Y., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Pitka, A., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qi, T. . Y., Qian, S., Qiao, C. F., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Richter, M., Ripka, M., Rivetti, A., Rolo, M., Rong, G., Rosner, Ch., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Shan, W., Shan, X. Y., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Shi, X., Song, J. J., Song, W. M., Song, X. Y., Sosio, S., Sowa, C., Spataro, S., Sun, 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., Tan, Y. T, Tang, C. J., Tang, G. Y., Tang, X., Tapan, I., Tiemens, M., Tsednee, B., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, Dan, Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, Meng, Wang, M. Z., Wang, P., Wang, P. L., Wang, W. P., Wang, X. F., Wang, Y., Wang, Y. F., Wang, Y. Q., Wang, Z., Wang, Z. G., Wang, Z. Y., Wang, Zongyuan, Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, Y., Xiao, D., Xiao, Y. J., Xiao, Z. J., Xie, Y. G., Xie, Y. H., Xiong, X. A., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, F., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. H., Yang, Y. X., Yang, Yifan, Yang, Z. Q., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, Y., Yuncu, A., Zafar, A. A., Zeng, Y., Zeng, Z., Zhang, 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, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, 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., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, Q., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhou, Xiaoyu, Zhou, Xu, Zhu, A. N., Zhu, J., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zou, B. S., and Zou, J. H.
Subjects: Dalitz plot, annihilation [electron positron], eta(958): radiative decay, High Energy Physics - Experiment, eta(958): hadronic decay, photon: mass, hadronic decay [eta(958)], branching ratio: upper limit [J/psi(3100)], charmonium: decay, J/psi(3100): branching ratio: measured, Nuclear Experiment, mixing [photon], photon: leptonic decay, leptonic decay [photon], decay [charmonium], rare decay [J/psi(3100)], electron positron: colliding beams, Beijing Stor, J/psi(3100): semileptonic decay, (electron positron) [mass spectrum], mass dependence, electroproduction [J/psi(3100)], photon: mixing, +photon+pi%2B+pi%22">eta(958) --> photon pi+ pi, colliding beams [electron positron], Astrophysics::High Energy Astrophysical Phenomena, mass [photon], electron positron: annihilation, branching ratio: measured [J/psi(3100)], J/psi(3100): branching ratio: upper limit, mass spectrum: (electron positron), ddc:530, hidden sector [photon], J/psi(3100): electroproduction, photon: hidden sector, BES, radiative decay [eta(958)], semileptonic decay [J/psi(3100)], J/psi(3100): rare decay, electromagnetic, High Energy Physics::Experiment, +eta%28958%29+electron+positron%22">J/psi(3100) --> eta(958) electron positron, +eta+pi%2B+pi%22">eta(958) --> eta pi+ pi, new particle, experimental results
Abstract: Physical review / D D 99(1), 012013 (2019). doi:10.1103/PhysRevD.99.012013, Using a data sample of (1310.6±7.0)×106 J/ψ decay events collected with the BESIII detector at BEPCII, we study the electromagnetic Dalitz decay J/ψ→η′e+e- with two dominant η′ decay modes, η′→γπ+π- and η′→π+π-η. The branching fraction is determined to be B(J/ψ→η′e+e-)=(6.59±0.07±0.17)×10-5, which improves in precision by a factor of 2 over the previous BESIII measurement. A search for the dark photon (γ′) is performed via J/ψ→η′γ′, γ′→e+e-. Excluding the ω and ϕ mass regions, no significant signal is observed in the mass range from 0.1 to 2.1 GeV/c2. We set upper limits at the 90% confidence level on B(J/ψ→η′γ′)×B(γ′→e+e-), B(J/ψ→η′γ′) and the mixing strength as a function of dark photon mass. This is among the first searches for dark photons in charmonium decays., Published by Inst.189733, Melville, NY
Published: 2019
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5. Precision Study of $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ Decay Dynamics

Author: BESIII Collaboration, Ablikim, M., Achasov, M. N., Ahmed, S., Ai, X. C., Albayrak, O., Albrecht, M., Ambrose, D. J., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Ferroli, R. Baldini, Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, S., Chen, S. J., Chen, X., Chen, X. R., Chen, Y. B., Cheng, H. P., Chu, X. K., Cibinetto, G., Dai, H. L., Dai, J. P., Dbeyssi, A., Dedovich, D., Deng, Z. Y., Denig, A., Denysenko, I., Destefanis, M., De Mori, F., Ding, Y., Dong, C., Dong, J., Dong, L. Y., Dong, M. Y., Dou, Z. L., Du, S. X., Duan, P. F., Fan, J. Z., Fang, J., Fang, S. S., Fang, X., Fang, Y., Farinelli, R., Fava, L., Fedorov, O., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guan, Y. H., Guo, A. Q., Guo, L. B., Guo, R. P., Guo, Y., Guo, Y. P., Haddadi, Z., Hafner, A., Han, S., Hao, X. Q., Harris, F. A., He, K. L., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, C., Hu, H. M., Hu, J. F., Hu, T., Hu, Y., Huang, G. S., Huang, J. S., Huang, X. T., Huang, X. Z., Huang, Y., Huang, Z. L., Hussain, T., Ji, Q., Ji, Q. P., Ji, X. B., Ji, X. L., Jiang, L. W., Jiang, X. S., Jiang, X. Y., Jiao, J. B., Jiao, Z., Jin, D. P., Jin, S., Johansson, T., Julin, A., Kalantar-Nayestanaki, N., Kang, X. L., Kang, X. S., Kavatsyuk, M., Ke, B. C., Kiese, P., Kliemt, R., Kloss, B., Kolcu, O. B., Kopf, B., Kornicer, M., Kupsc, A., Kühn, W., Lange, J. S., Lara, M., Larin, P., Leithoff, H., Leng, C., Li, 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, Lei, Li, P. R., Li, Q. Y., Li, T., Li, W. D., Li, W. G., Li, X. L., Li, X. N., Li, X. Q., Li, Y. B., Li, Z. B., Liang, H., Liang, Y. F., Liang, Y. T., Liao, G. R., Lin, D. X., Liu, 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., Liu, J. B., Liu, J. P., Liu, J. Y., Liu, K., Liu, K. Y., Liu, L. D., Liu, P. L., Liu, Q., Liu, S. B., Liu, X., Liu, Y. B., Liu, Y. Y., Liu, Z. A., Liu, Zhiqing, Loehner, H., Long, Y. F., Lou, X. C., Lu, H. J., Lu, J. G., Lu, Y., Lu, Y. P., Luo, C. L., Luo, M. X., Luo, T., Luo, X. L., Lyu, X. R., Ma, 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., Maas, F. E., Maggiora, M., Malik, Q. A., Mao, Y. J., Mao, Z. P., Marcello, S., Messchendorp, J. G., Mezzadri, G., Min, J., Min, T. J., Mitchell, R. E., Mo, X. H., Mo, Y. J., Morales, C. Morales, Muchnoi, N. Yu., Muramatsu, H., Musiol, P., Nefedov, Y., Nerling, F., Nikolaev, I. B., Ning, Z., Nisar, S., Niu, S. L., Niu, X. Y., Olsen, S. L., Ouyang, Q., Pacetti, S., Pan, Y., Patteri, P., Pelizaeus, M., Peng, H. P., Peters, K., Pettersson, J., Ping, J. L., Ping, R. G., Poling, R., Prasad, V., Qi, H. R., Qi, M., Qian, S., Qiao, C. F., Qin, L. Q., Qin, N., Qin, X. S., Qin, Z. H., Qiu, J. F., Rashid, K. H., Redmer, C. F., Ripka, M., Rong, G., Rosner, Ch., Ruan, X. D., Sarantsev, A., Savrié, M., Schnier, C., Schoenning, K., Schumann, S., Shan, W., Shao, M., Shen, C. P., Shen, P. X., Shen, X. Y., Sheng, H. Y., Shi, M., Song, W. M., Song, X. Y., Sosio, S., Spataro, S., Sun, G. X., Sun, J. F., Sun, S. S., Sun, X. H., Sun, Y. J., Sun, Y. Z., Sun, Z. J., Sun, Z. T., Tang, C. J., Tang, X., Tapan, I., Thorndike, E. H., Tiemens, M., Uman, I., Varner, G. S., Wang, B., Wang, B. L., Wang, D., Wang, D. Y., Wang, K., Wang, L. L., Wang, L. S., Wang, M., Wang, P., Wang, P. L., Wang, W., 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., Weber, T., Wei, D. H., Weidenkaff, P., Wen, S. P., Wiedner, U., Wolke, M., Wu, L. H., Wu, L. J., Wu, Z., Xia, L., Xia, L. G., Xia, Y., Xiao, D., Xiao, H., Xiao, Z. J., Xie, Y. G., Xiu, Q. L., Xu, G. F., Xu, J. J., Xu, L., Xu, Q. J., Xu, Q. N., Xu, X. P., Yan, L., Yan, W. B., Yan, W. C., Yan, Y. H., Yang, H. J., Yang, H. X., Yang, L., Yang, Y. X., Ye, M., Ye, M. H., Yin, J. H., You, Z. Y., Yu, B. X., Yu, C. X., Yu, J. S., Yuan, C. Z., Yuan, W. L., Yuan, Y., Yuncu, A., Zafar, A. A., Zallo, A., Zeng, Y., Zeng, Z., Zhang, B. X., Zhang, B. Y., Zhang, C., Zhang, C. C., Zhang, D. H., Zhang, H. H., Zhang, H. Y., Zhang, J., Zhang, J. 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. N., Zhang, Y. T., Zhang, Yu, Zhang, Z. H., Zhang, Z. P., Zhang, Z. Y., Zhao, G., Zhao, J. W., Zhao, J. Y., Zhao, J. Z., Zhao, Lei, Zhao, Ling, Zhao, M. G., Zhao, Q., Zhao, Q. W., Zhao, S. J., Zhao, T. C., Zhao, Y. B., Zhao, Z. G., Zhemchugov, A., Zheng, B., Zheng, J. P., Zheng, W. J., Zheng, Y. H., Zhong, B., Zhou, L., Zhou, X., Zhou, X. K., Zhou, X. R., Zhou, X. Y., Zhu, K., Zhu, K. J., Zhu, S., Zhu, S. H., Zhu, X. L., Zhu, Y. C., Zhu, Y. S., Zhu, Z. A., Zhuang, J., Zotti, L., Zou, B. S., and Zou, J. H.
Subjects: rho(770), BES, omega(783), (pi+ pi-) [mass spectrum], radiative decay [eta(958)], +photon+eta%28958%29%22">J/psi(3100) --> photon eta(958), interference, anomaly, amplitude analysis, annihilation [electron positron], Beijing Stor, High Energy Physics - Experiment, electroproduction [J/psi(3100)], radiative decay [J/psi(3100)], rho(1450), +photon+pi%2B+pi%22">eta(958) --> photon pi+ pi, colliding beams [electron positron], High Energy Physics::Experiment, ddc:530, low [background], experimental results
Abstract: Using a low background data sample of $9.7\times10^{5}$ $J\psi\rightarrow\gamma\eta^\prime$, $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ 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 $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ are studied with both model-dependent and model-independent approaches. The contributions of $\omega$ and the $\rho(770)-\omega$ interference are observed for the first time in the decays $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ in both approaches. Additionally, a contribution from the box anomaly or the $\rho(1450)$ resonance is required in the model-dependent approach, while the process specific part of the decay amplitude is determined in the model-independent approach., Comment: 7 pages, 4 figures, 1 tables
Published: 2018
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6. Recent results on diffractive and forward physics at HERA

Author: Yuji, Yamazaki, H1 Collaboration, and ZEUS Collaboration
Subjects: Quark, Particle physics, Photon, Meson, direct production [photon], density [parton], QC1-999, electroproduction [vector meson], diffraction, Parton, low [transverse momentum], 01 natural sciences, 7. Clean energy, Nuclear physics, deep inelastic scattering [lepton p], Recoil, factorization, 0103 physical sciences, recoil, Neutron, ddc:530, Vector meson, 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, electroproduction [psi(3685)], electroproduction [heavy quark], High Energy Physics::Phenomenology, HERA, wave function [charmonium], electroproduction [J/psi(3100)], DESY HERA Stor, High Energy Physics::Experiment, photoproduction [rho(770)], ratio [cross section]
Abstract: Recent studies on diffractive processes in ep scattering at HERA are reviewed. Heavy quark production in diffractive processes was studied by tagging a D * meson in diffractive DIS events. The cross section for events with a prompt photon in the final state was also measured. The data are well reproduced by models using diffractive parton densities determined from inclusive diffractive DIS cross sections. Two studies were also made on exclusive vector meson production. The cross-section ratio σψ( (2S ))/σ (ψ (1S )), which reflects the difference in transverse shape of the charmonium wave functions, are compared to various models. Moreover, the diffractive ρ 0 photoproduction with a forward neutron, which has two vertices with small-pT recoil, were measured to study factorisation properties. The data show some indication of re-scattering.
Published: 2017
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7. Search for the process $\it{e^+e^-\to J/\psi + X}(1835)$ at $\sqrt{s}\approx10.6$GeV

Author: He, X. H., Wang, J., Bala, A., Sumiyoshi, T., Tamponi, U., Tanida, K., Tatishvili, G., Teramoto, Y., Uchida, M., Uglov, T., Unno, Y., Van Hulse, C., Varner, G., Bonvicini, G., Wang, C. H., Watanabe, Y., Yamashita, Y., Yashchenko, S., Zhang, C. C., Zhang, Z. P., Zhilich, V., Zhulanov, V., Zupanc, A., Belle Collaboration, Bozek, A., Chekelian, V., Chen, A., Cheon, B. G., Chilikin, K., Choi, Y., Cinabro, D., Dalseno, J., Ban, Y., Dolezal, Z., Drasal, Z., Dutta, D., Eidelman, S., Farhat, H., Fast, J. E., Ferber, T., Gaur, V., Gabyshev, N., Garmash, A., Wang, P., Gillard, R., Goh, Y. M., Golob, B., Haba, J., Hayashii, H., Hoshi, Y., Hou, W. S., Hsiung, Y. B., Ishikawa, A., Julius, T., Adachi, I., Kang, J. H., Kato, E., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, J. H., Kim, M. J., Kim, Y. J., Kinoshita, K., Klucar, J., Aihara, H., Ko, B. R., Kodys, P., Lee, S. H., Libby, J., Liu, Y., Liventsev, D., Matvienko, D., Miyata, H., Mizuk, R., Moll, A., Asner, D. M., Muramatsu, N., Mussa, R., Nakao, M., Nayak, M., Nedelkovska, E., Nisar, N. K., Nishida, S., Nitoh, O., Ogawa, S., Okuno, S., Aulchenko, V., Olsen, S. L., Pakhlova, G., Park, H., Pestotnik, R., Petric, M., Piilonen, L. E., Ritter, M., Rohrken, M., Rostomyan, A., Sahoo, H., Aushev, T., Sakai, Y., Sandilya, S., Santelj, L., Sanuki, T., Savinov, V., Schneider, O., Schnell, G., Schwanda, C., Senyo, K., Seon, O., Bakich, A. M., Shapkin, M., Shen, C. P., Shibata, T. A., Shiu, J. G., Shwartz, B., Sibidanov, A., Sohn, Y. S., Solovieva, E., Stanic, S., and Staric, M.
Subjects: associated production, recoil [mass spectrum], X(1835), branching ratio: upper limit [channel cross section], KEK-B, ddc:530, BELLE, annihilation [electron positron], leptonic decay [J/psi(3100)], approx. 10.58 GeV-cms, High Energy Physics - Experiment, electroproduction [J/psi(3100)], experimental results
Abstract: We report the results of a search for the $X(1835)$ state in the process $e^+e^-\to J/\psi+X(1835)$ using a data sample of 672 fb$^{-1}$ collected with the Belle detector at and near the $\Upsilon(4S)$ resonance at the KEKB asymmetric-energy $e^+e^-$ collider. No significant evidence is found for this process, and an upper limit is set on its cross section times the branching fraction: $\sigma_{\rm Born}(e^+e^- \to J/\psi X(1835)) \cdot$ {${\cal B}(X(1835)\to \ge 3$ charged tracks)} $< 1.3 \ {\rm fb}$ at 90% confidence level., Comment: submitted to PRD
Published: 2013
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8. $J/\psi$ production in deep inelastic scattering

Author: Zwirner, Lennart
Subjects: electron p: deep inelastic scattering, Born approximation, lepton nucleon: inclusive reaction, neutral current, vector dominance, jet: associated production, diffraction, nonrelativistic [quantum chromodynamics], charged current, numerical calculations: interpretation of experiments, differential cross section: momentum transfer, interpretation of experiments [numerical calculations], deep inelastic scattering [lepton nucleon], deep inelastic scattering [positron p], associated production [jet], momentum transfer [differential cross section], lepton nucleon: deep inelastic scattering, J/psi(3100): electroproduction, channel cross section, quantum chromodynamics: nonrelativistic, positron p: deep inelastic scattering, neutrinoproduction [J/psi(3100)], thesis, perturbation theory: higher-order, bibliography, singlet [color], CERN SPS, J/psi(3100): neutrinoproduction, electroproduction [J/psi(3100)], higher-order [perturbation theory], rapidity spectrum, transverse momentum: spectrum, differential cross section: energy dependence, energy dependence [differential cross section], deep inelastic scattering [electron p], H1, color: singlet, spectrum [transverse momentum], inclusive reaction [lepton nucleon]
Abstract: Universität Hamburg, Diss., 2003; 154 pp., (2003). doi:10.3204/DESY-THESIS-2003-040, Published by Deutsches Elektronen-Synchrotron, DESY, Hamburg
Published: 2003
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9. Evidence for color octet mechanism from CERN LEP-2 $\gamma \gamma \to J/\psi$ + $X$ data

Author: Klasen, M., Kniehl, Bernd A., Mihaila, L. N., and Steinhauser, M.
Subjects: two-photon [exchange], octet [color], Astrophysics::High Energy Astrophysical Phenomena, inelastic scattering [electron positron], High Energy Physics::Phenomenology, nonrelativistic [quantum chromodynamics], bibliography, resolved [photon], inclusive reaction [photon photon], CERN LEP Stor [interpretation of experiments], electroproduction [J/psi(3100)], photoproduction [J/psi(3100)], factorization, ddc:550, High Energy Physics::Experiment, spectrum [transverse momentum], Nuclear Experiment, numerical calculations
Abstract: We present theoretical predictions for the transverse-momentum distribution of J/psi mesons promptly produced in gamma gamma collisions within the factorization formalism of nonrelativistic quantum chromodynamics, including the contributions from both direct and resolved photons, and we perform a conservative error analysis. The fraction of J/psi mesons from decays of bottom-flavoured hadrons is estimated to be negligibly small. New data taken by the DELPHI Collaboration at LEP2 nicely confirm these predictions, while they disfavour those obtained within the traditional colour-singlet model.
Published: 2002
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10. The QCD pomeron at TESLA: Motivation and exclusive $J / \psi$ production

Author: Kwiecinski, J., Motyka, L., and De Roeck, A.
Subjects: two-photon [exchange], Lipatov equation, electron positron: inelastic scattering, exclusive reaction [photon photon], +2J%2Fpsi%283100%29%22">photon photon --> 2J/psi(3100), photoproduction [J/psi(3100)], counters and detectors: efficiency, +2J%2Fpsi%283100%29+positron+electron%22">electron positron --> 2J/psi(3100) positron electron, J/psi(3100): photoproduction, quantum chromodynamics, J/psi(3100): pair production, channel cross section: energy dependence, numerical calculations, J/psi(3100): electroproduction, Obernai 1999/10/16 [talk], exchange: two-photon, efficiency [counters and detectors], photon photon: exclusive reaction, inelastic scattering [electron positron], talk: Obernai 1999/10/16, pair production [J/psi(3100)], energy dependence [channel cross section], electroproduction [J/psi(3100)], exchange: pomeron, pomeron [exchange]
Abstract: 8 pp. (2000)., We briefly present the motivation for studying the processes mediated by the QCD pomeron at high energy $e^+e^-$ colliders. We describe the behaviour of the cross-section for the reaction $\gamma \gamma \to J/\psi J/\psi$ obtained from the BFKL equation with dominant non-leading corrections. We give the predictions for the rates of anti-tagged $e^+e^- \to e^+e^- J/\psi J/\psi$ events in TESLA and conclude that such reactions may be excellent probes of the hard pomeron.
Published: 2000
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11. Color Octet Contribution to J/psi Photoproduction Asymmetries

Author: George Japaridze, Avto Tkabladze, and W.-D. Nowak
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, octet [color], Octet, High Energy Physics::Lattice, inclusive reaction [lepton p], High Energy Physics::Phenomenology, Nuclear Theory, polarized beam [photon], FOS: Physical sciences, nonrelativistic [quantum chromodynamics], electroproduction [J/psi(3100)], High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), photoproduction [J/psi(3100)], factorization, inclusive reaction [photon p], ddc:530, polarized target [p], High Energy Physics::Experiment, asymmetry [spin], numerical calculations, Nuclear Experiment
Abstract: We investigate $J/\psi$ photoproduction asymmetries in the framework of the NRQCD factorization approach. It is shown that the color octet contribution leads to large uncertainties in the predicted asymmetries which rules out the possibility to precisely measure the gluon polarization in the nucleon through this final state. For small values of the color octet parameters being compatible with $J/\psi$ photoproduction data it appears possible that a measurement of $J/\psi$ asymmetries could provide a new test for the NRQCD factorization approach, on one hand, or a measurement of the polarized gluon distribution from low inelasticity events $(z, Comment: 10 pages, LaTeX, with 6 eps figs included with epsfig.sty
Published: 1999
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12. Associated $J/\psi$ + $\gamma$ photoproduction as a probe of the color octet mechanism

Author: Cacciari, Matteo, Greco, Mario, and Kramer, Michael, 1
Subjects: +J%2Fpsi%283100%29+photon+anything%22">anti-p p --> J/psi(3100) photon anything, charmonium, inclusive reaction [anti-p p], 1800 GeV-cms (anti-p p), High Energy Physics::Lattice, Feynman graph, Nuclear Theory, 300-GeV-cms (electron p) [100 GeV-cms (photon p)], nonrelativistic [quantum chromodynamics], +J%2Fpsi%283100%29+photon+anything%22">electron p --> J/psi(3100) photon anything, +J%2Fpsi%283100%29+photon+anything%22">photon p --> J/psi(3100) photon anything, mass spectrum, photoproduction [J/psi(3100)], factorization, inclusive reaction [photon p], ddc:530, Nuclear Experiment, channel cross section, octet [color], High Energy Physics::Phenomenology, electroproduction [J/psi(3100)], energy [differential cross section], associated production [photon], one-photon [exchange], High Energy Physics::Experiment, photoproduction [quarkonium], spectrum [transverse momentum], inclusive reaction [electron p]
Abstract: The associated production of a J/psi and a photon in photon-hadron collisions is considered, and shown to be a good probe of the presence of colour-octet mediated channels in quarkonia production, as predicted by the factorization approach within NRQCD. Total and differential cross sections for photoproduction at fixed target experiments and at HERA are presented. Associated J/psi + gamma production at hadron colliders is briefly discussed.
Published: 1997
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13. Color octet contributions to $J/\psi$ photoproduction

Author: Cacciari, Matteo and Kramer, Michael
Subjects: energy spectrum [J/psi(3100)], octet [color], Feynman graph, Nuclear Theory, High Energy Physics::Phenomenology, J/psi(3100) [photoproduction], nonrelativistic [quantum chromodynamics], energy dependence [channel cross section], electroproduction [J/psi(3100)], DESY HERA Stor, photoproduction [J/psi(3100)], interpretation of experiments [numerical calculations], inclusive reaction [photon p], ddc:550, High Energy Physics::Experiment, inclusive reaction [electron p], J/psi(3100) [electroproduction], J/psi(3100) [energy spectrum]
Abstract: We have calculated the leading color-octet contributions to the production of $J/\psi$ particles in photon-proton collisions. Using the values for the color-octet matrix elements extracted from fits to prompt $J/\psi$ data at the Tevatron, we demonstrate that distinctive color-octet signatures should be visible in $J/\psi$ photoproduction. However, these predictions appear at variance with recent experimental data obtained at HERA, indicating that the phenomenological importance of the color-octet contributions is smaller than expected from theoretical considerations and suggested by the Tevatron fits.
Published: 1996
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14. QCD corrections to inelastic J/$\psi$ photoproduction

Author: Krämerr, Michael
Subjects: bremsstrahlung: gluon, renormalization: dependence, gluon [bremsstrahlung], J/psi(3100) [photoproduction], electron p: inclusive reaction, energy spectrum, correction [quantum chromodynamics], fusion: photon gluon, gluon: bremsstrahlung, electroproduction: J/psi(3100), quantum chromodynamics: correction, photon quark [interaction], numerical calculations: interpretation of experiments, photoproduction [J/psi(3100)], interpretation of experiments [numerical calculations], inclusive reaction [photon p], J/psi(3100): photoproduction, spectrum: transverse momentum, ddc:530, higher-order [Feynman graph], interaction [photon quark], channel cross section: energy dependence, bremsstrahlung [gluon], J/psi(3100) [electroproduction], J/psi(3100): electroproduction, exchange [one-photon], Feynman graph: higher-order, perturbation theory: higher-order, dependence [renormalization], photoproduction: J/psi(3100), bibliography, one-photon: exchange, transverse momentum [spectrum], energy dependence [channel cross section], interaction: photon quark, electroproduction [J/psi(3100)], higher-order [perturbation theory], photon gluon [fusion], DESY HERA Stor, transverse momentum: spectrum, one-photon [exchange], spectrum [transverse momentum], inclusive reaction [electron p], photon p: inclusive reaction, photon quark: interaction, exchange: one-photon
Abstract: 42 pp. (1996)., We present a complete calculation of the higher-order perturbative QCD corrections to inelastic photoproduction of J / ψ particles. A comprehensive analysis of total cross sections and differential distributions for the energy range of the fixed-target experiments and for inelastic J/ψ photoproduction at HERA is performed. The cross section and the J / ψ energy spectrum are compared wth the available photoproduction data including first results from HERA. This analysis will not only provide information on the gluon distribution of the proton but appears to be a clean test for the underlying picture of quarkonium production as developed so far in the perturbative QCD sector.
Published: 1996
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15. Photoproduction of J /$\psi$ mesons at HERA

Author: Ahmed, T., Aid, S., Andreev, V., Andrieu, B., Appuhn, R. D., Arpagaus, M., Babaev, A., Bahr, J., Ban, J., Baranov, P., Barrelet, E., Bartel, W., Barth, M., Bassler, U., Beck, H. P., Behrend, H. J., Belousov, A., Berger, Christoph, Bergstein, H., Bernardi, G., Bernet, R., Bertrand-Coremans, G., Besancon, M., Beyer, R., Biddulph, P., Bizot, J. C., Blobel, V., Borras, K., Botterweck, F., Boudry, V., Braemer, A., Brasse, F., Braunschweig, W., Brisson, V., Bruncko, D., Brune, C., Buchholz, R., Bungener, L., Burger, J., Busser, F. W., Bunyatyan, A., Burke, Stephen, Buschhorn, G., Campbell, A. J., Carli, T., Charles, F., Clarke, D., Clegg, Arthur B., Colombo, M., Contreras, J. G., Coughlan, J. A., Courau, A., Coutures, C., Cozzika, G., Criegee, L., Cussans, D. G., Cvach, J., Dagoret, S., Dainton, J. B., Danilov, M., Dau, W. D., Daum, K., David, M., Deffur, E., Delcourt, B., Del Buono, L., de Roeck, A., De Wolf, E. A., Di Nezza, P., Dollfus, C., Dowell, J. D., Dreis, H. B., Duboc, J., Duellmann, Dirk, Dunger, O., Duhm, H., Ebert, J., Ebert, T. R., Eckerlin, Guenter, Efremenko, V., Egli, S., Ehrlichmann, H., Eichenberger, S., Eichler, R., Eisele, F., Eisenhandler, E., Ellison, R. J., Elsen, E., Erdmann, M., Erdmann, W., Evrard, E., Favart, L., Fedotov, A., Feeken, D., Felst, R., Feltesse, J., Ferencei, J., Ferrarotto, F., Flamm, K., Fleischer, M., Flieser, M., Flugge, G., Fomenko, A., Fominykh, B., Forbush, M., Formanek, J., Foster, J. M., Franke, G., Fretwurst, E., Gabathuler, E., Gabathuler, K., Gamerdinger, K., Garvey, J., Gayler, Joerg, Gebauer, M., Gellrich, A., Genzel, H., Gerhards, R., Goerlach, U., Goerlich, L., Gogitidze, N., Goldberg, M., Goldner, D., Gonzalez-Pineiro, B., Goodall, A. M., Gorelov, I., Gorichev, P., Grab, C., Grassler, H., Grassler, R., Greenshaw, T., Grindhammer, Guenter, Gruber, A., Gruber, C., Haack, J., Haidt, D., Hajduk, L., Hamon, O., Hampel, M., Hanlon, E. M., Hapke, M., Haynes, W. J., Heatherington, J., Hedberg, V., Heinzelmann, G., Henderson, R. C. W., Henschel, H., Herma, R., Herynek, I., Hess, M. F., Hildesheim, W., Hill, P., Hiller, K. H., Hilton, C. D., Hladky, J., Hoeger, K. C., Hoppner, M., Horisberger, R., Huet, P., Hufnagel, H., Ibbotson, M., Itterbeck, H., Jabiol, M. A., Jacholkowska, A., Jacobsson, C., Jaffre, M., Janoth, J., Jansen, T., Jonsson, L., Johannsen, K., Johnson, D. P., Johnson, L., Jung, H., Kalmus, P. I. P., Kant, D., Kaschowitz, R., Kasselmann, P., Kathage, U., Kaufmann, H. H., Ghazaryan, Samvel, Kenyon, I. R., Kermiche, S., Keuker, C., Kiesling, Christian M., Klein, M., Kleinwort, C., Knies, G., Ko, W., Kohler, T., Kolanoski, H., Kole, F., Kolya, S. D., Korbel, V., Korn, M., Kostka, P., Kotelnikov, S. K., Krasny, M. W., Krehbiel, H., Krucker, D., Kruger, U., Kruner-Marquis, U., Kubenka, J. P., Kuster, H., Kuhlen, M., Kurca, T., Kurzhofer, J., Kuznik, B., Lacour, D., Lamarche, F., Lander, R., Landon, M. P. J., Lange, W., Lanius, P., Laporte, J. F., Lebedev, A., Leverenz, C., Levonian, S., Ley, C., Lindner, A., Lindstrom, G., Linsel, F., Lipinski, J., List, B., Loch, P., Lohmander, H., Lopez, G. C., Luke, D., Magnussen, N., Malinovski, E., Mani, S., Maracek, R., Marage, P., Marks, J., Marshall, R., Martens, J., Martin, R., Martyn, H. U., Martyniak, J., Masson, S., Mavroidis, T., Maxfield, S. J., McMahon, S. J., Mehta, A., Meier, K., Mercer, D., Merz, T., Meyer, C. A., Meyer, H., Meyer, J., Mikocki, S., Milstead, D., Moreau, F., Morris, J. V., Muller, G., Muller, K., Murin, P., Nagovizin, V., Nahnhauer, R., Naroska, B., Naumann, T., Newman, Paul R., Newton, D., Neyret, D., Nguyen, H. K., Niebergall, F., Niebuhr, C., Nisius, R., Nowak, G., Noyes, G. W., Nyberg-Werther, M., Oberlack, H., Obrock, U., Olsson, J. E., Panaro, E., Panitch, A., Pascaud, C., Patel, G. D., Peppel, E., Perez, E., Phillips, J. P., Pichler, C., Pitzl, D., Pope, G., Prell, Soeren A., Prosi, R., Radel, G., Raupach, F., Reimer, P., Reinshagen, S., Ribarics, P., Riech, V., Riedlberger, J., Riess, S., Rietz, M., Robertson, S. M., Robmann, P., Roloff, H. E., Roosen, R., Rosenbauer, K., Rostovtsev, A., Rouse, F., Royon, C., Ruter, K., Rusakov, S., Rybicki, K., Rylko, R., Sahlmann, N., Sanchez, E., Sankey, D. P., Savitsky, M., Schacht, P., Schiek, S., Schleper, P., von Schlippe, W., Schmidt, C., Schmidt, D., Schmitz, G., Schoning, A., Schroder, V., Schuhmann, E., Schwab, B., Schwind, A., Seehausen, U., Sefkow, F., Seidel, M., Sell, R., Semenov, A., Chekelian, V. I., Sheviakov, I., Shooshtari, H., Shtarkov, L. N., Siegmon, G., Siewert, U., Sirois, Y., Skillicorn, I. O., Smirnov, P., Smith, J. R., Solovev, Ya., Spitzer, H., Starosta, R., Steenbock, M., Steffen, P., Steinberg, R., Stella, B., Stephens, K., Stier, J., Stiewe, J., Stosslein, U., Strachota, J., Straumann, U., Struczinski, W., Sutton, J. P., Tapprogge, S., Taylor, Richard E., Chernyshov, V., Thiebaux, C., Thompson, Graham, Tikhomirov, I., Truoel, Peter, Turnau, J., Tutas, J., Ulkes, P., Usik, A., Valkar, S., Valkarova, A., Vallee, C., Van Esch, P., Van Mechelen, P., Vartapetian, A., Vazdik, Y., Vecko, M., Verrecchia, P., Villet, G., Wacker, K., Wagener, A., Wagener, M., Walker, I. W., Walther, A., Weber, G., Weber, M., Wegener, D., Wegner, A., Wellisch, H. P., West, L. R., Willard, S., Winde, M., Winter, G. G., Wright, A. E., Wunsch, E., Wulff, N., Yiou, T. P., Zacek, J., Zarbock, D., Zhang, Z., Zimmer, M., Zimmermann, W., Zomer, F., Zuber, K., and H1 Collaboration
Subjects: spectrum: momentum transfer, electron p: inclusive reaction, J/psi(3100) [photoproduction], electroproduction: J/psi(3100), +muon%2B+muon%22">J/psi(3100) --> muon+ muon, momentum transfer [spectrum], transverse momentum [differential cross section], 296 GeV-cms, +positron+electron%22">J/psi(3100) --> positron electron, leptonic decay: J/psi(3100), differential cross section [transverse momentum], photoproduction [J/psi(3100)], J/psi(3100): photoproduction, inclusive reaction [photon p], transverse momentum: differential cross section, +J%2Fpsi%283100%29+anything%22">electron p --> J/psi(3100) anything, ddc:530, channel cross section: energy dependence, J/psi(3100) [electroproduction], J/psi(3100): electroproduction, colliding beams [electron p], DESY DESY HERA Stor Stor, photoproduction: J/psi(3100), electron p [colliding beams], energy dependence [channel cross section], J/psi(3100) [leptonic decay], electroproduction [J/psi(3100)], colliding beams: electron p, J/psi(3100): leptonic decay, electron p: colliding beams, differential cross section: transverse momentum, H1, momentum transfer: spectrum, spectrum [momentum transfer], leptonic decay [J/psi(3100)], photon p: inclusive reaction, inclusive reaction [electron p], experimental results
Abstract: 13 pp. (1994)., We present a study of J ψ meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J ψ mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of σ(ep → J ψ X) = (8.8±2.0±2.2) nb is determined for 30 GeV ≤ W γp ≤ 180 GeV and Q 2 ≲ 4 GeV 2 . Using the flux of quasi-real photons with Q 2 ≲ 4 GeV 2 , a total production cross section of σ ( γp → J / ψX ) = (56±13±14) nb is derived at an average W γp =90 GeV. The distribution of the squared momentum transfer t from the proton to the J ψ can be fitted using an exponential exp(− b ∥ t ∥) below a ∥ t ∥ of 0.75 GeV 2 yielding a slope parameter of b = (4.7±1.9) GeV −2 .
Published: 1994
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16. Results on two-body decays of the (3100)-resonance

Author: Criegee, L., Dehne, H. C., Waloschek, P., Winter, G. G., Wolff, S., Zimmermann, W., Fox, J., Franke, G., Horlitz, G., Knies, G., Lohrmann, E., Schmitz, R., Ranga Swamy, T. N., and Timm, U.
Subjects: WEAK INTERACTION [MODEL], DECAY MODES [J/PSI(3100)], FINAL STATE [P], ANTI-P [FINAL STATE], +P+ANTI-P+P%22">J/PSI(3100) --> P ANTI-P P, J/PSI(3100) [DECAY MODES], J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], P: FINAL STATE, MAGNETIC FIELD, FINAL STATE: ANTI-P, MUON+ [FINAL STATE], DECAY [BACKSCATTER], ANTI-P: FINAL STATE, PROPORTIONAL CHAMBER: EXPERIMENTAL RESULTS, BACKSCATTER: DECAY, +MUON%2B+MUON%22">J/PSI(3100) --> MUON+ MUON, BACKSCATTER [DECAY], EXPERIMENTAL RESULTS: PROPORTIONAL CHAMBER, FINAL STATE [MUON+], COLLIDING BEAMS: ELECTRON POSITRON, FINAL STATE [MUON-], MODEL: WEAK INTERACTION, P [FINAL STATE], DESY DORIS STOR, DECAY MODES: J/PSI(3100), FINAL STATE: MUON, FINAL STATE: MUON+, COLLIDING BEAMS [ELECTRON POSITRON], MUON-: FINAL STATE, FOUR-PI-DETECTOR, ELECTROPRODUCTION: J/PSI(3100), ELECTRON POSITRON [COLLIDING BEAMS], DECAY: FORWARD SCATTERING, ELECTRON POSITRON: COLLIDING BEAMS, PROPORTIONAL CHAMBER [EXPERIMENTAL RESULTS], J/PSI(3100): DECAY MODES, MUON+: FINAL STATE, FINAL STATE: P, MUON- [FINAL STATE], DECAY: BACKSCATTER, J/PSI(3100) [ELECTROPRODUCTION], FINAL STATE [ANTI-P], FORWARD SCATTERING [DECAY], EXPERIMENTAL RESULTS [PROPORTIONAL CHAMBER]
Abstract: 10 pp. (1975).
Published: 1975
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17. SELECTED TOPICS ON e+ e- PHYSICS

Author: Wolf, Guenter E.
Subjects: SPECTRUM [LONGITUDINAL MOMENTUM], TAU [ELECTROPRODUCTION], J/PSI(3100): ELECTROPRODUCTION, PSI MESONS, ELECTROPRODUCTION [J/PSI(3100)], BIBLIOGRAPHY, (3JET): FINAL STATE, HADRON: ELECTROPRODUCTION, LONGITUDINAL MOMENTUM [SPECTRUM], ELECTROPRODUCTION [HADRON], ONE-PHOTON [EXCHANGE], QUANTUM ELECTRODYNAMICS: VALIDITY TEST, UPSILON MESONS, TOP [SEARCH FOR], FORM FACTOR: HADRON, ELECTROPRODUCTION: HADRON, HADRON [ELECTROPRODUCTION], LECTURES: EXPERIMENTAL RESULTS, JET [ELECTROPRODUCTION], FINAL STATE: (3JET), ELECTROPRODUCTION: JET, SPECTRUM: LONGITUDINAL MOMENTUM, COLLIDING BEAMS [ELECTRON POSITRON], STORAGE RING [ELECTRON POSITRON], HADRON [FORM FACTOR], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), EXPERIMENTAL RESULTS: LECTURES, ELECTRON POSITRON: COLLIDING BEAMS, RATIO [TOTAL CROSS SECTION], FINAL STATE [(3JET)], ELECTRON POSITRON: STORAGE RING, ELECTRON POSITRON [ANNIHILATION], ELECTROPRODUCTION [PSI(3700)], ANNIHILATION [ELECTRON POSITRON], EXCHANGE [ONE-PHOTON], ELECTROPRODUCTION [JET], SPECTRUM: TRANSVERSE MOMENTUM, EXPERIMENTAL RESULTS [LECTURES], J/PSI(3100) [ELECTROPRODUCTION], TRANSVERSE MOMENTUM: SPECTRUM, LECTURES [EXPERIMENTAL RESULTS], FORM FACTOR [HADRON], CHARMED PARTICLE, TAU: ELECTROPRODUCTION, RATIO: TOTAL CROSS SECTION, PSI(3700): ELECTROPRODUCTION, top, TOTAL CROSS SECTION [RATIO], (3JET) [FINAL STATE], HADRON: FORM FACTOR, CHARMONIUM, ELECTROPRODUCTION: TAU, TOTAL CROSS SECTION: RATIO, COLLIDING BEAMS: ELECTRON POSITRON, ELECTROPRODUCTION [TAU], SPECTRUM [TRANSVERSE MOMENTUM], JET: ELECTROPRODUCTION, ONE-PHOTON: EXCHANGE, ELECTROPRODUCTION: PSI(3700), VALIDITY TEST [QUANTUM ELECTRODYNAMICS], MODEL: QUARK PARTON, ELECTRON POSITRON [COLLIDING BEAMS], EXCHANGE: ONE-PHOTON, QUARK PARTON [MODEL], SEARCH FOR: TOP, TRANSVERSE MOMENTUM [SPECTRUM], PSI(3700) [ELECTROPRODUCTION], LONGITUDINAL MOMENTUM: SPECTRUM, ELECTRON POSITRON: ANNIHILATION
Abstract: 182 pp. (1980).
Published: 1980
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18. Measurement of the branching ratios for the decays $J\psi (3.1) \to f\omega$ and $J\psi (3.1) \to B\pi$

Author: Burmester, J., Criegee, L., Horlitz, G., Kahl, T., Knies, G., Rossler, M., Schmitz, R., Timm, U., Wahl, H., Waloschek, P., Winter, G. G., Wolff, S., Dehne, H. C., Zimmermann, W., Blobel, V., Koppitz, B., Lohrmann, E., Luhrsen, W., Backer, A., Burger, J., Grupen, C., Zech, Gunter, Meyer, H., Derikum, K., Wacker, K., PLUTO Collaboration, Devenish, R., Flugge, G., Fox, J. D., Franke, G., Gerke, C., and Harms, P.
Subjects: J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], FINAL STATE [PI0], J/PSI(3100): BRANCHING RATIO, J/PSI(3100): NONLEPTONIC DECAY, B(1235), PLUTO, +F%281260%29+OMEGA%28784%29%22">J/PSI(3100) --> F(1260) OMEGA(784), FINAL STATE [PI+], J/PSI(3100) [NONLEPTONIC DECAY], +2PI%2B+2PI-+PI0%22">ELECTRON POSITRON --> 2PI+ 2PI- PI0, BRANCHING RATIO [J/PSI(3100)], +B%281235%29+PI%22">J/PSI(3100) --> B(1235) PI, PI0 [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], PI+ [FINAL STATE], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], PI+: FINAL STATE, PI0: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], PI-: FINAL STATE, FINAL STATE: PI, FINAL STATE: PI0, MASS SPECTRUM, PI [FINAL STATE], NONLEPTONIC DECAY [J/PSI(3100)], FINAL STATE [PI-], OMEGA(784), ddc:530, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, FINAL STATE: PI+, 3.1 GEV-CMS, DESY DORIS STOR, ELECTRON POSITRON [COLLIDING BEAMS], PI: FINAL STATE, F(1260), FINAL STATE [PI], NONLEPTONIC DECAY: J/PSI(3100), PI- [FINAL STATE], ELECTRON POSITRON: ANNIHILATION
Abstract: (1977). doi:10.1016/0370-2693(77)90080-6, Decays of the J/ψ (3.1) resonance into final states with four charged and one neutral pion have been investigated. We measured the branching ratios J/ ψ (3.1) → f ω /all = 0.40 ± 0.14)% and J/ ψ (3.1) → (B + π − + B − π + )/all = (0.28 ± 0.07)%.
Published: 1977
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19. MUON - NUCLEON SCATTERING: QCD RELATED EXPERIMENTAL RESULTS

Author: Brasse, F. W.
Subjects: VALIDITY TEST [QUANTUM CHROMODYNAMICS], MULTIPLE PRODUCTION: MUON, TRANSVERSE MOMENTUM [HADRON], DIFFERENTIAL CROSS SECTION, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], EXPERIMENTAL RESULTS [SPECTROMETER], DIMUON [FINAL STATE], D: PAIR PRODUCTION, FINAL STATE: TRIMUON, HADRON: ELECTROPRODUCTION, MUON: MULTIPLE PRODUCTION, DIMUON: FINAL STATE, D: ELECTROPRODUCTION, ELECTROPRODUCTION [HADRON], FUSION: PHOTON GLUON, MULTIPLE PRODUCTION [MUON], ELECTROPRODUCTION [D], ELECTROPRODUCTION: HADRON, HADRON: TRANSVERSE MOMENTUM, MUON [MULTIPLE PRODUCTION], DEEP INELASTIC SCATTERING: MUON NUCLEON, SPECTROMETER: EXPERIMENTAL RESULTS, HADRON [ELECTROPRODUCTION], MUON NUCLEON: DEEP INELASTIC SCATTERING, STRUCTURE FUNCTION, SCALING: VIOLATION, VIOLATION [SCALING], FINAL STATE: DIMUON, FINAL STATE [DIMUON], 250: 280 GEV [120], ELECTROPRODUCTION: J/PSI(3100), CERN SPS, DEEP INELASTIC SCATTERING [MUON NUCLEON], PHOTON GLUON [FUSION], QUANTUM CHROMODYNAMICS: VALIDITY TEST, PAIR PRODUCTION: D, FINAL STATE [TRIMUON], J/PSI(3100) [ELECTROPRODUCTION], D [ELECTROPRODUCTION], TRIMUON [FINAL STATE], TRIMUON: FINAL STATE, PAIR PRODUCTION [D], 120: 250: 280 GEV, MUON NUCLEON [DEEP INELASTIC SCATTERING], D [PAIR PRODUCTION], ELECTROPRODUCTION: D
Abstract: 15 pp. (1980). doi:10.3204/PUBDB-2017-13056
Published: 1980
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20. Charm Spectroscopy using e+ e- Storage Rings

Author: Bartel, Wulfrin
Subjects: PSI(3700): WIDTH, DECAY MODES [PSI(3700)], PSI MESONS [HADRONIC DECAY], J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], LEPTONIC DECAY: CHARMED MESON, IIZUKA-OKUBO-ZWEIG [SELECTION RULE], SPIN [D], violation [CP], ELECTROPRODUCTION [HADRON], EXPERIMENTAL RESULTS: REVIEW, WIDTH [PSI(3700)], CASCADE DECAY [PSI(3700)], SPIN: D, QUANTUM NUMBER: J/PSI(3100), PSI MESONS: HADRONIC DECAY, CHARMONIUM [QUARK], HADRON [ELECTROPRODUCTION], STORAGE RING [ELECTRON POSITRON], PSI(3700) [QUANTUM NUMBER], ANNIHILATION: ELECTRON POSITRON, ELECTRON POSITRON [ANNIHILATION], ELECTROPRODUCTION [PSI(3700)], J/PSI(3100): QUANTUM NUMBER, D: PRODUCTION, ANNIHILATION [ELECTRON POSITRON], MASS [D], PSI MESONS: SPIN, ELECTROPRODUCTION [VECTOR MESON], D [MASS], PRODUCTION [D], ASSOCIATED PRODUCTION [D], DECAY MODES [J/PSI(3100)], WIDTH [J/PSI(3100)], J/PSI(3100) [DECAY MODES], D [DECAY MODES], HADRONIC DECAY: PSI MESONS, J/PSI(3100): WIDTH, CHARMED MESON: LEPTONIC DECAY, CP: violation, D [PRODUCTION], COLLIDING BEAMS: ELECTRON POSITRON, D: SPIN, CASCADE DECAY: PSI(3700), CHARMED MESON [LEPTONIC DECAY], D [SEMILEPTONIC DECAY], SYMMETRY: SU(3), LEPTONIC DECAY [CHARMED MESON], ELECTRON POSITRON [COLLIDING BEAMS], D: DECAY MODES, LUMINOSITY, PSI(3700) [ELECTROPRODUCTION], QUANTUM NUMBER [PSI(3700)], ELECTRON POSITRON: ANNIHILATION, SU(3) [SYMMETRY], PSI(3700) [CASCADE DECAY], QUARK: CHARMONIUM, EXPERIMENTAL RESULTS [REVIEW], HADRON: ELECTROPRODUCTION, PSI(3700): DECAY MODES, PSI MESONS [SPIN], DECAY MODES [D], ELECTROPRODUCTION: HADRON, DECAY MODES: PSI(3700), POSTULATED PARTICLE: ETA(C), DECAY MODES: J/PSI(3100), D [ASSOCIATED PRODUCTION], COLLIDING BEAMS [ELECTRON POSITRON], DECAY MODES: D, REVIEW [EXPERIMENTAL RESULTS], ELECTROPRODUCTION: J/PSI(3100), J/PSI(3100) [QUANTUM NUMBER], D: MASS, RATIO [TOTAL CROSS SECTION], ELECTRON POSITRON: COLLIDING BEAMS, D: SEMILEPTONIC DECAY, REVIEW: EXPERIMENTAL RESULTS, ELECTRON POSITRON: STORAGE RING, ETA(C) [POSTULATED PARTICLE], SELECTION RULE: IIZUKA-OKUBO-ZWEIG, PRODUCTION: D, MASS: D, VECTOR MESON [ELECTROPRODUCTION], ELECTROPRODUCTION: VECTOR MESON, J/PSI(3100) [ELECTROPRODUCTION], HADRONIC DECAY [PSI MESONS], ASSOCIATED PRODUCTION: D, RATIO: TOTAL CROSS SECTION, PSI(3700): ELECTROPRODUCTION, D: ASSOCIATED PRODUCTION, TOTAL CROSS SECTION [RATIO], QUANTUM NUMBER [J/PSI(3100)], LECTURES, D [SPIN], SPIN: PSI MESONS, SEMILEPTONIC DECAY: D, SEMILEPTONIC DECAY [D], PSI(3700) [DECAY MODES], PSI(3700): QUANTUM NUMBER, TOTAL CROSS SECTION: RATIO, ELECTROPRODUCTION: PSI(3700), SPIN [PSI MESONS], VECTOR MESON: ELECTROPRODUCTION, QUANTUM NUMBER: PSI(3700), J/PSI(3100): DECAY MODES, PSI(3700): CASCADE DECAY
Abstract: 86 pp. (1980).
Published: 1980
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21. Untersuchung von Zerfällen der $J/\psi(3.1)$-Resonanz in Baryonenpaare mit dem magnetischen Detektor PLUTO

Author: Harms, Petra
Subjects: ANTILAMBDA: FINAL STATE, LAMBDA [FINAL STATE], J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], BRANCHING RATIO: BOUNDARY CONDITION, FINAL STATE [PHOTON], +P+ANTI-P%22">J/PSI(3100) --> P ANTI-P, FINAL STATE: ANTI-P, J/PSI(3100): BRANCHING RATIO, J/PSI(3100): NONLEPTONIC DECAY, MOMENTUM [ENERGY SPECTRUM], THESIS, PLUTO, BOUNDARY CONDITION [BRANCHING RATIO], +P+ANTI-P+PI%2B+PI%22">J/PSI(3100) --> P ANTI-P PI+ PI, FINAL STATE [PI+], J/PSI(3100) [NONLEPTONIC DECAY], ENERGY SPECTRUM: MOMENTUM, BRANCHING RATIO [J/PSI(3100)], ENERGY DEPENDENCE [TOTAL CROSS SECTION], TOTAL CROSS SECTION: ENERGY DEPENDENCE, P [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], PI+ [FINAL STATE], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), FINAL STATE [SIGMA0], LAMBDA: FINAL STATE, ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANGULAR DEPENDENCE [MOMENTUM SPECTRUM], ANNIHILATION [ELECTRON POSITRON], FINAL STATE: P, FINAL STATE [ANTISIGMA0], PI+: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], ANGULAR DISTRIBUTION, FINAL STATE [ANTI-P], PI-: FINAL STATE, FINAL STATE: PI, FINAL STATE: SIGMA0, PHOTON [FINAL STATE], MASS SPECTRUM, FINAL STATE [P], ANTI-P [FINAL STATE], ANTISIGMA0: FINAL STATE, P: FINAL STATE, +SIGMA0%28P+PI-+PHOTON%29+ANTISIGMA0%28ANTI-P+PI%22">J/PSI(3100) --> SIGMA0(P PI- PHOTON) ANTISIGMA0(ANTI-P PI, FINAL STATE [LAMBDA], ANTILAMBDA [FINAL STATE], ANTI-P: FINAL STATE, NONLEPTONIC DECAY [J/PSI(3100)], MOMENTUM SPECTRUM: ANGULAR DEPENDENCE, FINAL STATE [PI-], FINAL STATE: ANTILAMBDA, PHOTON: FINAL STATE, +LAMBDA%28P+PI-%29+ANTILAMBDA%28ANTI-P+PI%2B%29%22">J/PSI(3100) --> LAMBDA(P PI-) ANTILAMBDA(ANTI-P PI+), SIGMA0 [FINAL STATE], COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, FINAL STATE: PI+, ANTISIGMA0 [FINAL STATE], +J%2FPSI%283100%29%22">ELECTRON POSITRON --> J/PSI(3100), FINAL STATE [ANTILAMBDA], FINAL STATE: PHOTON, DESY DORIS STOR, FINAL STATE: LAMBDA, +2PI%2B+2PI%22">J/PSI(3100) --> 2PI+ 2PI, ELECTRON POSITRON [COLLIDING BEAMS], FINAL STATE: ANTISIGMA0, 3.1 GEV-CM, NONLEPTONIC DECAY: J/PSI(3100), PI- [FINAL STATE], SIGMA0: FINAL STATE, ELECTRON POSITRON: ANNIHILATION
Abstract: 46 pp. (1978).
Published: 1978
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22. Inclusive J$\psi$ production in $e^+ e^-$ annihilation in the energy range from 4.0-GeV to 5.0-GeV

Author: Burmester, J., Criegee, L., Kahl, T., Knies, G., Rossler, M., Schmitz, Ruediger, Timm, U., Wahl, H., Waloschek, P., Winter, G. G., Wolf, S., Zimmermann, W., Dehne, H. C., Blobel, V., Jensing, H., Koppitz, B., Lohrmann, E., Luhrsen, W., Backer, A., Burger, J., Grupen, C., Rost, M., Zech, Gunter, Derikum, K., Meyer, H., Wacker, K., PLUTO Collaboration, Devenish, R., Flugge, G., Fox, J. D., Franke, G., Gerke, C., and Horlitz, G.
Subjects: +J%2FPSI%283100%29+%28N%29CHARGED+PARTICLE%22">ELECTRON POSITRON --> J/PSI(3100) (N)CHARGED PARTICLE, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], MUON+ [FINAL STATE], VIOLATION [SELECTION RULE], IIZUKA-OKUBO-ZWEIG [SELECTION RULE], +MUON%2B+MUON%22">J/PSI(3100) --> MUON+ MUON, PLUTO, DIRECT PRODUCTION [CHANNEL CROSS SECTION], ddc:530, FINAL STATE [MUON+], COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, FINAL STATE [MUON-], SEARCH FOR: ENHANCEMENT, DESY DORIS STOR, FINAL STATE: MUON, PSI(3700): BACKGROUND, CHANNEL CROSS SECTION: DIRECT PRODUCTION, FINAL STATE: MUON+, ELECTRON POSITRON: INCLUSIVE REACTION, COLLIDING BEAMS [ELECTRON POSITRON], MUON-: FINAL STATE, ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), INCLUSIVE REACTION [ELECTRON POSITRON], ELECTRON POSITRON [COLLIDING BEAMS], RADIATIVE DECAY [PSI(3700)], BACKGROUND [PSI(3700)], ELECTRON POSITRON: COLLIDING BEAMS, J/PSI(3100): DIRECT PRODUCTION, ELECTRON POSITRON [ANNIHILATION], ENHANCEMENT [SEARCH FOR], SELECTION RULE: IIZUKA-OKUBO-ZWEIG, MUON+: FINAL STATE, SELECTION RULE: VIOLATION, ANNIHILATION [ELECTRON POSITRON], DIRECT PRODUCTION [J/PSI(3100)], MUON- [FINAL STATE], J/PSI(3100) [ELECTROPRODUCTION], PSI(3700): RADIATIVE DECAY, 4.0-5.0 GEV-CMS, ELECTRON POSITRON: ANNIHILATION
Abstract: (1977). doi:10.1016/0370-2693(77)90289-1, We report on inclusive production of J ψ (3.1)-mesons observed in e + e − -annihilation in the energy range s = 4.0–5.0 GeV . After substraction of the radiative tail of the ψ(3.7) direct production of the J ψ (3.1) is found to be in the order of 0.1% of the total hadronic cross section. No enhancements are seen at s = 4.03 GeV and 4.4 GeV. The level is in agreement with expectations from violation of the Zweig-rule.
Published: 1977
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23. Recent results on $e^+ e^-$ annihilation from PLUTO at DORIS

Author: Meyer, Hinrich
Subjects: MUON [ELECTROPRODUCTION], ELECTROPRODUCTION: MUON, K0(S): ELECTROPRODUCTION, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], DIMUON [FINAL STATE], HADRON: ELECTROPRODUCTION, ELECTROPRODUCTION [HADRON], HEAVY LEPTON [ELECTROPRODUCTION], PLUTO, CHARMED MESON: ELECTROPRODUCTION, ELECTROPRODUCTION [MUON], ELECTROPRODUCTION: K0(S), MUON: ELECTROPRODUCTION, ELECTROPRODUCTION: HADRON, ELECTROPRODUCTION [HEAVY LEPTON], COLLIDING BEAMS: ELECTRON POSITRON, ELECTROPRODUCTION [K0(S)], CHARMED MESON [ELECTROPRODUCTION], HADRON [ELECTROPRODUCTION], FINAL STATE: (MUON ELECTRON), FINAL STATE: DIMUON, COLLIDING BEAMS [ELECTRON POSITRON], ELECTRON POSITRON: INCLUSIVE REACTION, ELECTROPRODUCTION: CHARMED MESON, ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ELECTRON POSITRON [COLLIDING BEAMS], INCLUSIVE REACTION [ELECTRON POSITRON], ELECTROPRODUCTION [CHARMED MESON], ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], HEAVY LEPTON: ELECTROPRODUCTION, TOTAL CROSS SECTION, ELECTROPRODUCTION: HEAVY LEPTON, ANNIHILATION [ELECTRON POSITRON], J/PSI(3100) [ELECTROPRODUCTION], (MUON ELECTRON) [FINAL STATE], INTERPRETATION OF EXPERIMENTS, ELECTRON POSITRON: ANNIHILATION, K0(S) [ELECTROPRODUCTION]
Abstract: 36 pp. (1977).
Published: 1977
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24. Radiative decays of the J/$\psi$ and evidence for a new heavy resonance

Author: Braunschweig, W., Martyn, H.-U., Hultschig, H., Joos, P., Koch, W., Kotz, U., Krehbiel, H., Kreinick, D., McNeely, W. A., Moffeit, K. C., Petersen, A., Schliwa, M., Sander, H. G., Wiik, B. H., Wolf, G., Grindhammer, Guenter, Ludwig, J., Mess, K. H., Poelz, G., Ringel, J., Sauerberg, K., Schmueser, Peter, de Boer, W., Schmitz, Daniel, Buschhorn, G., Gunderson, B., Kotthaus, R., Lierl, H., Oberlack, H., Pretzl, K., Orito, S., Suda, T., Totsuka, Y., Yamada, S., Sturm, W., DASP Collaboration, Wallraff, W., Berkelman, Karl, Cords, D., Felst, R., and Gadermann, E.
Subjects: RADIATIVE DECAY: WIDTH, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], FINAL STATE [PHOTON], ETA(549), (3PHOTON) [FINAL STATE], J/PSI(3100): BRANCHING RATIO, FINAL STATE [PI0], EXPERIMENTAL RESULTS [DESY DORIS STOR], EXPERIMENTAL RESULTS: DESY DORIS STOR, +X%282830%29+PHOTON%22">J/PSI(3100) --> X(2830) PHOTON, WIDTH: RADIATIVE DECAY, BRANCHING RATIO [J/PSI(3100)], +3PHOTON%22">J/PSI(3100) --> 3PHOTON, +ETA%28958%29+PHOTON%22">J/PSI(3100) --> ETA(958) PHOTON, +PI0+PHOTON%22">J/PSI(3100) --> PI0 PHOTON, PI0 [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], FINAL STATE: (3PHOTON), RADIATIVE DECAY [J/PSI(3100)], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ETA(958), ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], +ETA%28549%29+PHOTON%22">J/PSI(3100) --> ETA(549) PHOTON, ANNIHILATION [ELECTRON POSITRON], PI0: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], X(2830), J/PSI(3100): RADIATIVE DECAY, MAGNETIC SPECTROMETER: DASP, FINAL STATE: PI0, PHOTON [FINAL STATE], PHOTON: FINAL STATE, WIDTH [RADIATIVE DECAY], DESY DORIS STOR [EXPERIMENTAL RESULTS], ddc:530, DESY DORIS STOR: EXPERIMENTAL RESULTS, COLLIDING BEAMS: ELECTRON POSITRON, 3.1 GEV-CMS, FINAL STATE: PHOTON, DASP [MAGNETIC SPECTROMETER], ELECTRON POSITRON [COLLIDING BEAMS], RADIATIVE DECAY [WIDTH], High Energy Physics::Experiment, ELECTRON POSITRON: ANNIHILATION
Abstract: (1977). doi:10.1016/0370-2693(77)90114-9, The three photon final state produced in e + e − collisions has been measured at the mass of the J ψ resonance using the nonmagnetic part of the double arm spectrometer DASP. The decays J ψ → ηγ, η'γ and π o γ were observed and their branching ratios are given. A four standard deviation signal was observed in the γγ mass spectrum at a mass of (2.83 ± 0.03) GeV. An upper limit is given for the direct decay J ψ → 3γ .
Published: 1977
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25. CORRELATIONS IN ELECTRON - POSITRON, LEPTON - HADRON AND HADRON - HADRON COLLISIONS

Author: Koch, Wolfgang
Subjects: CORRELATION: TWO-PARTICLE, 53 GEV-CMS [34], FRAGMENTATION [QUARK], CHARGED PARTICLE [ELECTROPRODUCTION], EXPERIMENTAL RESULTS [REVIEW], COLLIDING BEAMS [P P], J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], HADRONIC DECAY: J/PSI(3100), COLLIDING BEAMS [ANTI-P P], QUARK: FLAVOR, ANTI-P P [COLLIDING BEAMS], ASYMMETRY [MULTIPLE PRODUCTION], CORRELATION FUNCTION: RAPIDITY, CHARGED PARTICLE: MULTIPLICITY, COLLIDING BEAMS: ANTI-P P, MULTIPLE PRODUCTION [ASYMMETRY], COLLIDING BEAMS [ELECTRON POSITRON], HADROPRODUCTION: CHARGED PARTICLE, CORRELATION [BARYON ANTIBARYON], MULTIPLICITY [CHARGED PARTICLE], ANNIHILATION: ELECTRON POSITRON, BARYON ANTIBARYON: CORRELATION, ELECTROPRODUCTION: J/PSI(3100), ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], REVIEW: EXPERIMENTAL RESULTS, ANTI-P P [INTERACTION], P P [COLLIDING BEAMS], ANTI-P P: INTERACTION, ANNIHILATION [ELECTRON POSITRON], CHARGED PARTICLE: ELECTROPRODUCTION, RAPIDITY [CORRELATION FUNCTION], 34: 53 GEV-CMS, J/PSI(3100) [ELECTROPRODUCTION], P P: COLLIDING BEAMS, QUARK: FRAGMENTATION, INTERACTION [ANTI-P P], ANGULAR DEPENDENCE [MULTIPLICITY], INTERACTION: ANTI-P P, FLAVOR [QUARK], HADRONIC DECAY [J/PSI(3100)], J/PSI(3100) [HADRONIC DECAY], ELECTROPRODUCTION [CHARGED PARTICLE], CHARGED PARTICLE: MULTIPLE PRODUCTION, CHARGED PARTICLE [MULTIPLE PRODUCTION], TWO-PARTICLE [CORRELATION], ELECTROPRODUCTION: CHARGED PARTICLE, P P [INTERACTION], INTERACTION: P P, MULTIPLE PRODUCTION: ASYMMETRY, COLLIDING BEAMS: P P, COLLIDING BEAMS: ELECTRON POSITRON, MULTIPLICITY: ANGULAR DEPENDENCE, P P: INTERACTION, CHARGED PARTICLE: HADROPRODUCTION, MULTIPLE PRODUCTION [CHARGED PARTICLE], INTERACTION [P P], JET: CHARGE CORRELATION, J/PSI(3100): HADRONIC DECAY, ELECTRON POSITRON [COLLIDING BEAMS], ANTI-P P: COLLIDING BEAMS, CHARGE CORRELATION [JET], MULTIPLE PRODUCTION: CHARGED PARTICLE, ASYMMETRY: MULTIPLE PRODUCTION, CHARGED PARTICLE [HADROPRODUCTION], HADROPRODUCTION [CHARGED PARTICLE], ELECTRON POSITRON: ANNIHILATION
Abstract: 30 pp. (1982).
Published: 1982
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26. Untersuchung von Bhabhastreuung und kollinearen Photonpaaren für Schwerpunktsenergien von 3.1 und 3.7 GeV und von Strahlungszerfällen der $J/\psi$-Resonanz in pseudoskalare Mesonen am Speicherring DORIS

Author: Ludwig, Jens
Subjects: ELECTRON [FINAL STATE], +POSITRON+ELECTRON%22">PSI(3700) --> POSITRON ELECTRON, PHOTON: PAIR PRODUCTION, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], FINAL STATE [PHOTON], ETA(549), ELECTROMAGNETIC DECAY [J/PSI(3100)], (3PHOTON) [FINAL STATE], FINAL STATE [PI0], THESIS, +2PHOTON%22">ELECTRON POSITRON --> 2PHOTON, FINAL STATE: POSITRON, +POSITRON+ELECTRON%22">J/PSI(3100) --> POSITRON ELECTRON, FINAL STATE [ELECTRON], +ETA%28958%29+PHOTON%22">J/PSI(3100) --> ETA(958) PHOTON, +PI0+PHOTON%22">J/PSI(3100) --> PI0 PHOTON, PI0 [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], FINAL STATE: (3PHOTON), RADIATIVE DECAY [J/PSI(3100)], POSITRON: FINAL STATE, ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ETA(958), POSITRON [FINAL STATE], FINAL STATE: ELECTRON, ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ELASTIC SCATTERING], J/PSI(3100): ELECTROMAGNETIC DECAY, ELECTRON POSITRON [ANNIHILATION], ELECTROPRODUCTION [PSI(3700)], 3.1: 3.7 GEV-CMS, PHOTON [PAIR PRODUCTION], +ETA%28549%29+PHOTON%22">J/PSI(3100) --> ETA(549) PHOTON, ELASTIC SCATTERING: ELECTRON POSITRON, ELASTIC SCATTERING [ELECTRON POSITRON], ANNIHILATION [ELECTRON POSITRON], PI0: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], PAIR PRODUCTION: PHOTON, MAGNETIC SPECTROMETER: DASP, J/PSI(3100): RADIATIVE DECAY, FINAL STATE: PI0, PHOTON [FINAL STATE], PSI(3700): ELECTROPRODUCTION, ELECTRON POSITRON: ELASTIC SCATTERING, PHOTON: FINAL STATE, PSI(3700): ELECTROMAGNETIC DECAY, MAGNETIC SPECTROMETER: EXPERIMENTAL RESULTS, COLLIDING BEAMS: ELECTRON POSITRON, ELECTROMAGNETIC DECAY [PSI(3700)], MAGNETIC SPECTROMETER [EXPERIMENTAL RESULTS], ELECTRON: FINAL STATE, FINAL STATE: PHOTON, DESY DORIS STOR, DASP [MAGNETIC SPECTROMETER], 3.7 GEV-CMS [3.1], ELECTROPRODUCTION: PSI(3700), ELECTRON POSITRON [COLLIDING BEAMS], PAIR PRODUCTION [PHOTON], PSI(3700) [ELECTROPRODUCTION], FINAL STATE [POSITRON], EXPERIMENTAL RESULTS: MAGNETIC SPECTROMETER, EXPERIMENTAL RESULTS [MAGNETIC SPECTROMETER], ELECTRON POSITRON: ANNIHILATION
Abstract: 58 pp. (1976).
Published: 1976
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27. Measurement of the $J\psi$ radiative decay into $F_0$ (1270) $\gamma$

Author: Alexander, G., Criegee, L., Horlitz, G., Kahl, T., Knies, G., Rossler, M., Schmitz, R., Timm, U., Wahl, H., Waloschek, P., Winter, Graeme, Wolff, S., Dehne, H. C., Zimmermann, W., Blobel, V., Koppitz, B., Lohrmann, E., Luhrsen, W., Backer, A., Burger, J., Grupen, C., Zech, Gunter, Meyer, H., Derikum, K., Wacker, K., PLUTO Collaboration, Devenish, R., Flugge, G., Fox, J. D., Franke, G., Gerke, C., and Harms, P.
Subjects: +F%281260%29+PHOTON%22">J/PSI(3100) --> F(1260) PHOTON, J/PSI(3100): ELECTROPRODUCTION, ELECTROPRODUCTION [J/PSI(3100)], FINAL STATE [PHOTON], FINAL STATE [PI0], J/PSI(3100): BRANCHING RATIO, J/PSI(3100): NONLEPTONIC DECAY, PLUTO, FINAL STATE [PI+], J/PSI(3100) [NONLEPTONIC DECAY], BRANCHING RATIO [J/PSI(3100)], +RHO%28770%29+PI0%22">J/PSI(3100) --> RHO(770) PI0, PI0 [FINAL STATE], COLLIDING BEAMS [ELECTRON POSITRON], +PI%2B+PI%22">F(1260) --> PI+ PI, RADIATIVE DECAY [J/PSI(3100)], PI+ [FINAL STATE], ANNIHILATION: ELECTRON POSITRON, ELECTROPRODUCTION: J/PSI(3100), ELECTRON POSITRON: COLLIDING BEAMS, ELECTRON POSITRON [ANNIHILATION], ANNIHILATION [ELECTRON POSITRON], PI+: FINAL STATE, PI0: FINAL STATE, J/PSI(3100) [ELECTROPRODUCTION], PI-: FINAL STATE, J/PSI(3100): RADIATIVE DECAY, +PI%2B+PI%22">RHO(770) --> PI+ PI, FINAL STATE: PI, (PI+ PI-) [MASS SPECTRUM], FINAL STATE: PI0, PHOTON [FINAL STATE], NONLEPTONIC DECAY [J/PSI(3100)], FINAL STATE [PI-], MASS SPECTRUM: (PI+ PI-), PHOTON: FINAL STATE, ddc:530, COLLIDING BEAMS: ELECTRON POSITRON, EXPERIMENTAL RESULTS, FINAL STATE: PI+, 3.1 GEV-CMS, FINAL STATE: PHOTON, DESY DORIS STOR, ELECTRON POSITRON [COLLIDING BEAMS], F(1260), NONLEPTONIC DECAY: J/PSI(3100), PI- [FINAL STATE], ELECTRON POSITRON: ANNIHILATION, RHO(770)
Abstract: (1978). doi:10.1016/0370-2693(78)90742-6, The J/ψ decay modes f 0 (1270)γ and ρπ have been studied in e + e − collision at 3.1 GeV center of mass energy leading to the π + π − γ and π + π − π 0 final states. The f 0 γ decay branching ratio is measured to be (0.20 ± 0.07) × 10 −2 , a value comparable to the J/ψ radiative decay rates into the ηγ and η′γ channels. The J/ψ decay branching ratio into ϱπ is measured to be (1.6 ± 0.4) × 10 −2 .
Published: 1977
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27 results on '"electroproduction [J/psi(3100)]"'

1. Measurement of branching fractions of $J/��$ and $��(3686)$ decays to $��^+$ and $ \bar{\Sigma}^{��}$

2. Measurement of the cross-section ratio σ ψ(2S) / σ J/ψ(1S) in deep inelastic exclusive ep scattering at HERA

3. Study of the Dalitz decay $J/\psi \to e^+e^- \eta$

4. Measurement of $\mathcal{B}(J/\psi \to \eta' e^+ e^-)$ and search for a dark photon

5. Precision Study of $\eta^\prime\rightarrow\gamma\pi^+\pi^-$ Decay Dynamics

6. Recent results on diffractive and forward physics at HERA

7. Search for the process $\it{e^+e^-\to J/\psi + X}(1835)$ at $\sqrt{s}\approx10.6$GeV

8. $J/\psi$ production in deep inelastic scattering

9. Evidence for color octet mechanism from CERN LEP-2 $\gamma \gamma \to J/\psi$ + $X$ data

10. The QCD pomeron at TESLA: Motivation and exclusive $J / \psi$ production

11. Color Octet Contribution to J/psi Photoproduction Asymmetries

12. Associated $J/\psi$ + $\gamma$ photoproduction as a probe of the color octet mechanism

13. Color octet contributions to $J/\psi$ photoproduction

14. QCD corrections to inelastic J/$\psi$ photoproduction

15. Photoproduction of J /$\psi$ mesons at HERA

16. Results on two-body decays of the (3100)-resonance

17. SELECTED TOPICS ON e+ e- PHYSICS

18. Measurement of the branching ratios for the decays $J\psi (3.1) \to f\omega$ and $J\psi (3.1) \to B\pi$

19. MUON - NUCLEON SCATTERING: QCD RELATED EXPERIMENTAL RESULTS

20. Charm Spectroscopy using e+ e- Storage Rings

21. Untersuchung von Zerfällen der $J/\psi(3.1)$-Resonanz in Baryonenpaare mit dem magnetischen Detektor PLUTO

22. Inclusive J$\psi$ production in $e^+ e^-$ annihilation in the energy range from 4.0-GeV to 5.0-GeV

23. Recent results on $e^+ e^-$ annihilation from PLUTO at DORIS

24. Radiative decays of the J/$\psi$ and evidence for a new heavy resonance

25. CORRELATIONS IN ELECTRON - POSITRON, LEPTON - HADRON AND HADRON - HADRON COLLISIONS

26. Untersuchung von Bhabhastreuung und kollinearen Photonpaaren für Schwerpunktsenergien von 3.1 und 3.7 GeV und von Strahlungszerfällen der $J/\psi$-Resonanz in pseudoskalare Mesonen am Speicherring DORIS

27. Measurement of the $J\psi$ radiative decay into $F_0$ (1270) $\gamma$

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27 results on '"electroproduction [J/psi(3100)]"'

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