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1. Unraveling the Orbital Physics in a Canonical Orbital System KCuF3

Author

Xiaopei Liu, Jeroen van den Brink, Jianshi Zhou, Ke-Jin Zhou, Abhishek Nag, Hong Ding, Lei Xu, Jiemin Li, Krzysztof Wohlfeld, H. C. Robarts, A. C. Walters, and Mirian García-Fernández

Subjects
Physics, Strongly Correlated Electrons (cond-mat.str-el), Orbiton, Condensed matter physics, Scattering, Ab initio, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, Quantum chemistry, Condensed Matter - Strongly Correlated Electrons, 0103 physical sciences, Condensed Matter::Strongly Correlated Electrons, 010306 general physics, Ansatz
Abstract

We explore the existence of the collective orbital excitations, orbitons, in the canonical orbital system KCuF$_3$. Using the Cu $L_3$-edge resonant inelastic X-ray scattering we show that the non-dispersive high-energy peaks result from the Cu$^{2+}$ $dd$ orbital excitations. These high-energy modes show good agreement with the {\it ab-initio} quantum chemistry calculation based on a single cluster, indicating that the $dd$ excitations are highly localized. At the same time, the low-energy excitations present clear dispersion. They match extremely well with the two-spinon continuum following the comparison with Mueller Ansatz calculations. The localized $dd$ excitations and the observation of the strongly dispersive magnetic excitations suggest that orbiton dispersion is below the resolution detection limit. Our results can reconcile with the strong {\it local} Jahn-Teller effect in KCuF$_3$, which predominantly drives orbital ordering., Comment: 6 pages, 4 figures

Published
2021

2. 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

3. Measurements ofhc(P11)inψ′Decays

Author

J. G. Lu, H. H. Zhang, T. Hu, Sachio Komamiya, Y. J. Sun, Zong-Ping Zheng, S. Sonoda, Xiao-Yang Zhang, P. L. Wang, Qi-Wen Lü, M. G. Zhao, Y. Yuan, Guangming Huang, Z. Wu, Xiaobo Zhu, Y. Zeng, Zhe Sun, Miao He, Y. X. Yang, Y. P. Lu, Q. Zhao, Peng Chen, H. B. Liu, Jifeng Hu, L. P. Zhou, Q. Liu, Qun-Yao Wang, Q. P. Ji, Y. Z. Sun, M. Qi, Y. F. Wang, H. L. Tian, J. M. Bian, Zhenyu Zhang, J. Z. Bai, Yang Gao, Xiangdong Ruan, Hongli Ma, S. Lange, N. Yu. Muchnoi, Z. P. Mao, Feng Liu, Shan Wang, S. Grishin, J. Z. Zhang, J. Fang, Y. H. Zhang, Yi-Fang Zhao, S. B. Liu, J. B. Jiao, M. Maggiora, Ling Zhao, Y. Ding, Ming Xu, Jia Liu, L. Zhang, X. T. Liao, J. C. Chen, G. S. Varner, Hang Liu, Y. H. Yan, J. Zhong, H. Y. Sheng, X. Y. Ma, W. X. Gong, X. Wan, Lei Zhao, Yi Bing Chen, Z. Y. He, Z. L. Hou, X. B. Ma, Yu-Bin Liu, Y. Nefedov, Yao Wang, B. Huang, X. H. Mo, L. S. Wang, F. Li, Z. Y. Wang, C. X. Yu, G. R. Lu, X. X. Cao, HongSheng Zhao, R. Poling, K. Goetzen, W. Kuehn, Jianping Zheng, W. G. Li, Y. J. Mao, Z. A. Zhu, B. Zheng, R. G. Ping, M. H. Ye, F. C. Ma, Shuang Han, Y. P. Guo, J. K. C. Leung, Jiawei Wang, B. Q. Wang, W. B. Yan, L. An, M. N. Achasov, S. J. Zhao, J. S. Huang, X. R. Li, P. Zweber, M. Y. Duan, X. L. Ji, D. H. Sun, F. A. Harris, B. S. Zou, H. Xu, Q. M. Zhu, F. P. Ning, K. Y. Liu, Z. Xue, G. A. Chelkov, X. P. Xu, C. Zhu, M. Destefanis, Y. P. Chu, X. B. Ji, C. F. Qiao, M. Shao, Y. T. Gu, Z. G. Zhao, S. Qian, Jialun Ping, G. M. Xu, C. Z. Yuan, L. L. Wang, Niklaus Berger, X. L. Li, Brent J. Liu, Y. W. Liu, X. H. Liu, J. F. Qiu, Y. Zhang, Q. An, Yuehong Xie, C. S. Ji, Yongxiang Li, M. L. Chen, X. Tang, Y. T. Liang, Wei Wu, A. Zhemchugov, X. D. Wang, Q. J. Li, X. Q. Li, T. R. Liang, San-Ming Yang, J. F. Sun, Y. Q. Wang, J. F. Chang, S. L. Olsen, G. C. Liu, R. A. Briere, H. M. Liu, Z. B. Li, J. P. Dai, Z. H. An, X. S. Jiang, C. J. Tang, Kunlun He, S. X. Du, N. Wu, Krisztian Peters, A. Sarantsev, D. H. Wei, C. L. Ma, Z. A. Liu, Y. Ban, X. Cai, L. K. Jia, Xiao-Tong Lu, M. Ablikim, G. Rong, M. Y. Dong, K. J. Zhu, H. H. Liu, Mingming Yang, W. D. Li, G. F. Cao, G. F. Xu, G. R. Liao, J. C. Li, Michela Greco, S. P. Wen, D. M. Li, L. Y. Dong, S. H. Zhang, S. Jin, H. M. Hu, C. Geng, Cui Li, X. N. Li, C. P. Shen, B. X. Zhang, Yin Xu, S. Spataro, X. L. Wang, M. X. Luo, J. H. Zou, H. X. Yang, Z. J. Xiao, M. Pelizaeus, J. L. Fu, D. V. Dedovich, Peidong Yang, J. W. Zhang, S. S. Sun, L. H. Wu, D. Cronin-Hennessy, L. L. Jiang, Chun S. J. Pun, Xingtao Huang, X. W. Hu, D. Toth, Y. S. Zhu, H. B. Li, C. L. Luo, Z. L. Zhou, L. P. Chen, J. P. Liu, C. X. Liu, Ke Wang, G. Li, Jingwei Zhao, Jiawei Zhao, Fang Liu, Cang Zhao, C. C. Zhang, B. Zhong, L. B. Guo, Tiefu Zhao, I. Denysenko, Xueyong Shen, Lei Li, Sai-Juan Chen, Zujian Wang, Qingming Ma, B. Y. Zhang, Ulrich Wiedner, C. D. Fu, C. Q. Feng, Cheng Li, Jiemin Li, Zhi-Jun Sun, Z. Y. Deng, Y. H. Zheng, X. Sun, Y. F. Liang, Z. Z. Xu, Min Xu, B. Spruck, D. P. Jin, Chang Liu, X. H. Zhao, Q. Ouyang, Y. B. Liu, G. X. Sun, Li Yan, V. V. Bytev, Fu-Hu Liu, D. H. Zhang, L. Yu, Hao Liang, X. L. Luo, X. F. Tang, Y. M. Wu, Lu Li, A. Q. Guo, J. Zhuang, Tao Luo, B. X. Yu, Chuan Liu, H. S. Chen, Yong Liu, H. L. Dai, Igor Boyko, Z. G. Wang, H. Y. Zhang, J. X. Zuo, G. F. Chen, J. Y. Zhang, J. Min, Y. K. Heng, and Yanping Huang

Subjects
Physics, Particle decay, Classical mechanics, Meson, Branching fraction, Electron–positron annihilation, Hadron, Analytical chemistry, Pi, General Physics and Astronomy, Quarkonium, Dimensionless quantity
Abstract

We present measurements of the charmonium state h(c) (P-1(1)) made with 106 x 10(6) psi' events collected by BESIII at BEPCII. Clear signals are observed for psi' -> pi(0)h(c) with and without the subsequent radiative decay h(c) -> gamma eta(c). First measurements of the absolute branching ratios B(psi' -> pi(0)h(c)) = (8.4 +/- 1.3 +/- 1.0 x 10(-4) and B(h(c) -> gamma eta(c)) = (54.3 +/- 6.7 +/- 5.2)% are presented. A statistics-limited determination of the previously unmeasured h(c) width leads to an upper limit Gamma(h(c)) pi(0)h(c)) x B(h(c) -> gamma eta(c)) = (4.58 +/- 0.40 +/- 0.50) x 10(-4) are consistent with previous results.

Published
2010

4. Observation of Two NewN*Peaks inJ/ψ→pπ−n¯andp¯π+nDecays

Author

C. Z. Yuan, Zhe Wang, Jun-Bing Ma, X. Y. Ma, W. X. Gong, J. C. Li, X. Shi, Qiyang Zhang, P. Wang, X. Q. Li, H. Qin, Ke Wang, H. Y. Zhang, G. S. Huang, H. Y. Sheng, J. Nie, S. P. Chi, X. H. He, Jin Wang, K. J. Zhu, J. M. Yuan, Chun-Hua Jiang, Zujian Wang, J. Y. Zhang, H. S. Chen, Huirun Chen, N. D. Qi, Y. B. Zhao, Y. S. Dai, C. S. Gao, X. J. Zhao, X. H. Mo, L. S. Wang, M. H. Ye, Juan Zhang, Shang Lunlin, Jinxing Zheng, G. Li, Y. K. Heng, C. D. Fu, Z. Y. Deng, Y. Y. Zhang, Y. X. Yang, Z. Y. Zhang, Y. P. Chu, X. B. Ji, J. G. Lu, Z. G. Zhao, Han-Qing Zheng, S. T. Xue, L. Huang, B.S. Zou, Z. J. Sun, T. Hu, XZ（蔡翔舟） Cai, Z. J. Guo, X. L. Li, S. L. Olsen, Z. Y. Wang, H. B. Li, C. L. Luo, H. M. Hu, Y. N. Guo, Lianyou Shan, M. L. Chen, Nongjian Tao, C. C. Zhang, L. Y. Dong, Yu Zeng, Y. J. Zhang, X. C. Zhong, R. Y. Li, Cunfeng Wei, Ning Zhou, J. W. Zhang, Z. D. Nie, X. Y. Zhang, Jiming Yang, R. G. Liu, Q. J. Li, Y. M. Wu, J. B. Liu, D. H. Wei, S. D. Gu, Q. Yue, J. Z. Wang, Xintong Li, X. X. Xie, G. S. Varner, Qingying Jia, Y. F. Liang, D. P. Jin, Jun Chen, Zheng Wang, D. H. Zhang, C. S. Yu, Z. Z. Du, Z. X. Liu, L. L. Ma, Yudan Wang, Z. A. Liu, G. R. Lu, J. C. Chen, Y. Ban, Z. A. Zhu, J. Z. Bai, J. Fang, L. S. Zheng, S. L. Zang, Q. M. Zhu, Y. C. Xu, M. Z. Wang, S. Z. Wang, H. S. Sun, Haiping Peng, S. D. Yang, K. L. He, H. L. Dai, R. B. Li, Jin Chen, L. H. Yi, Y. Jin, S. S. Fang, Xunchao Zhang, M. G. Zhao, Yingchun Zhu, Z. Y. Yi, X. L. Luo, Miao He, L. P. Zhou, Z. P. Mao, X. Tang, B. X. Zhang, Z. P. Zheng, Xiru Huang, M. Y. Gong, G. L. Tong, M. Ablikim, B. A. Zhuang, Yang Tian, S. X. Du, M. L. Yan, Q. M. Ma, Fang Liu, Y. Yuan, Y. S. Zhu, J. G. Bian, Feng Shi, D. X. Zhao, B. Y. Zhang, Guangzhao Zhou, Hangxu Li, Jiemin Li, J. B. Zhao, X. Y. Shen, G. F. Xu, S. Jin, F. Li, F. C. Ma, S. Q. Zhang, Y. Z. Sun, J. F. Qiu, C. D. Qian, S. M. Li, Fan Yang, Bing Zhou, W. R. Zhao, F. Liu, Y. N. Gao, Y. Zeng, Y. Q. Guo, Y. B. Chen, J. W. Zhao, Y. F. Lai, H. F. Chen, W. F. Wang, G. W. Yu, N. Wu, P. P. Zhao, Lei Zhang, G. Rong, Y. C. Zhu, X. S. Jiang, Bo Xin, P. L. Wang, W. G. Li, D. Y. Wang, H. M. Liu, J. F. Chang, Hongbo Liao, Yiyun Zhang, Y. X. Ye, H. X. Yang, H.S. Xu, J. P. Liu, F. A. Harris, Z. Y. Ren, Z. P. Zhang, Xingzhu Cui, S. S. Sun, X. M. Xia, H. Y. Fu, D. L. Shen, C. X. Liu, and F. Lu

Subjects
Physics, General Physics and Astronomy
Published
2006

5. Observation of a Near-Threshold Enhancement in thepp¯Mass Spectrum from RadiativeJ/ψ→γpp¯Decays

Author

K. Li, X. L. Luo, L. W. Song, J. Z. Wang, M. H. Ye, Y. C. Zhu, Stephen L. Olsen, R. B. Li, D. P. Jin, N. Wu, P. L. Wang, Meng Wang, J. J. He, L. Y. Dong, D. H. Zhang, Y. Jin, Y. J. Zhang, S. D. Yang, C. S. Yu, Fang Liu, C. F. Liu, Yingchun Zhu, Y. N. Guo, H. Shen, R. Y. Li, J. W. Zhao, Feng Shi, S. T. Xue, G. W. Yu, S. L. Zang, D. X. Zhao, Jing Wang, Y. B. Zhao, S. P. Chi, F. Lu, B. Y. Zhang, Jiemin Li, L. S. Wang, Xintong Li, F. Li, X. X. Xie, F. C. Ma, J. F. Chang, C. D. Qian, S. D. Gu, Guangzhao Zhou, Cunfeng Wei, Ning Zhou, H. Y. Zhang, Liang Huang, Yiyun Zhang, Q. Yue, B. X. Zhang, Q. J. Li, Xingzhu Cui, K. J. Zhu, J. M. Yuan, Yang Tian, Z. P. Zheng, H. S. Chen, G. S. Huang, M. L. Gao, Bing Zhou, Y. X. Ye, Y. Zeng, X. Y. Shen, Z. Zhao, J. F. Qiu, J. W. Zhang, Jie Chen, S. S. Fang, Z. J. Lu, Y. Q. Guo, J. Ying, J. Y. Zhang, Y. B. Chen, Y. B. Liu, J. Nie, Y. F. Lai, H. F. Chen, Yudan Wang, L. P. Zhou, S. Q. Tang, J. G. Bian, Xiru Huang, G. L. Tong, S. X. Du, W. F. Wang, X. C. Meng, G. R. Lu, Z. J. Guo, B. A. Zhuang, H. H. Li, Z. P. Mao, X. Q. Li, Y. K. Heng, Y. Y. Zhang, M. L. Yan, Z. A. Zhu, X. Y. Zhang, G. S. Varner, R. G. Liu, Y. S. Dai, T. Hong, G. Li, C. Z. Yuan, S. Q. Zhang, Zheng Wang, J. B. Liu, F. A. Harris, C. S. Gao, Jinxing Zheng, P. P. Zhao, Jiming Yang, Zhe Wang, C. D. Fu, Y. Z. Sun, X. S. Jiang, W. D. Li, X. Tang, Z. P. Zhang, K. L. He, Chun-Hua Jiang, W. B. Yan, S. W. Han, Qiyang Zhang, Z. Y. Wang, J. M. Zhang, J. C. Chen, Xuanhong Lou, W. H. Toki, Lei Zhang, R. Malchow, Joseph Izen, G. Rong, P. Wang, Zujian Wang, Q. M. Zhu, Y. Yuan, Y. S. Zhu, Y. M. Dai, Jun-Bing Ma, J. Fang, L. S. Zheng, Y. C. Xu, M. Z. Wang, D. Paluselli, W. X. Gong, D. Kong, W. R. Zhao, H. S. Sun, Y. P. Chu, X. B. Ji, F. Liu, M. Y. Gong, Haiping Peng, B.S. Zou, Jiawei Zhao, Y. N. Gao, J. Chen, H. M. Hu, Z. J. Ke, Z. J. Sun, L. P. Fu, Houbing Lu, C. C. Zhang, J. C. Li, H. X. Yang, W. G. Li, H. M. Liu, X. H. Mo, J. G. Lu, T. Hu, XZ（蔡翔舟） Cai, J. P. Liu, G. A. Yang, Z. Z. Du, B. D. Jones, S.S. Sun, X. C. Zhong, Z. X. Liu, W. Dunwoodie, D. Tian, G. F. Xu, S. Jin, H. Y. Sheng, N. D. Qi, Z. A. Liu, Y. Ban, J. Z. Bai, M. He, D. L. Shen, C. X. Liu, X. M. Xia, H. Y. Fu, Z. D. Nie, E. C. Ma, and X. H. He

Subjects
Physics, Nuclear physics, Antiparticle, Particle decay, Mass spectrum, Radiative transfer, General Physics and Astronomy, High Energy Physics::Experiment, Invariant mass, Elementary particle, Atomic physics, Nucleon, Resonance (particle physics)
Abstract

We observe a narrow enhancement near 2m(p) in the invariant mass spectrum of pp pairs from radiative J/psi-->gammapp decays. No similar structure is seen in J/psi-->pi(0)pp decays. The results are based on an analysis of a 58 x 10(6) event sample of J/psi decays accumulated with the BESII detector at the Beijing electron-positron collider. The enhancement can be fit with either an S- or P-wave Breit-Wigner resonance function. In the case of the S-wave fit, the peak mass is below 2m(p) at M=1859(+3)(-10) (stat)+5-25(syst) MeV/c(2) and the total width is Gamma

Published
2003

6. Unraveling the Orbital Physics in a Canonical Orbital System KCuF3.

Author

Jiemin Li, Lei Xu, Garcia-Fernandez, Mirian, Nag, Abhishek, Robarts, H. C., Walters, A. C., Liu, X., Jianshi Zhou, Wohlfeld, Krzysztof, van den Brink, Jeroen, Hong Ding, and Ke-Jin Zhou

Subjects
*JAHN-Teller effect, *PHYSICS, *INELASTIC scattering, *QUANTUM chemistry, *DETECTION limit
Abstract

We explore the existence of the collective orbital excitations, orbitons, in the canonical orbital system KCuF3 using the Cu L3-edge resonant inelastic x-ray scattering. We show that the nondispersive high-energy peaks result from the Cu2+ dd orbital excitations. These high-energy modes display good agreement with the ab initio quantum chemistry calculation, indicating that the dd excitations are highly localized. At the same time, the low-energy excitations present clear dispersion. They match extremely well with the two-spinon continuum following the comparison with Müller ansatz calculations. The localized dd excitations and the observation of the strongly dispersive magnetic excitations suggest that the orbiton dispersion is below the resolution detection limit. Our results can reconcile with the strong local Jahn-Teller effect in KCuF3, which predominantly drives orbital ordering. [ABSTRACT FROM AUTHOR]

Published
2021
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