Study of the Magnetic Dipole Transition of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:mi>γ</mml:mi> <mml:msub> <mml:mi>η

Using (10.087±0.044)×10^{9} J/ψ events collected with the BESIII detector at the e^{+}e^{-} BEPCII collider, we present the first amplitude analysis of J/ψ→γpp[over ¯] with the pp[over ¯] invariant mass in the η_{c} mass region [2.70,3.05] GeV/c^{2}. The product branching fraction B(J/ψ→γη_{c})×B(η_{c}→pp[over ¯]) is determined to be (2.11±0.02_{stat}±0.07_{syst})×10^{-5} with precision improved by 1 order of magnitude. Combining with the product branching fractions B(η_{c}→pp[over ¯])×B(η_{c}→γγ) and B(J/ψ→γη_{c})×B(η_{c}→γγ), the branching fractions of B(J/ψ→γη_{c}) and B(η_{c}→γγ) are calculated to be (2.29±0.01_{stat}±0.04_{syst}±0.18_{opbf})% and (2.28±0.01_{stat}±0.04_{syst}±0.18_{opbf})×10^{-4}, respectively, which are consistent with the latest lattice quantum chromodynamics calculations. Here, opbf is the uncertainty from the other product branching fractions used in the calculation.

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Journal
Physical Review Letters
Published
2026-01-09
DOI
https://doi.org/10.1103/r6yf-q6kv
Primary Topic
Quantum Chromodynamics and Particle Interactions
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article
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article

Study of the Magnetic Dipole Transition of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:mi>γ</mml:mi> <mml:msub> <mml:mi>η

G. Tonani, M. Maggiora, F. Hanisch, M. Wolke et al.
Physical Review Letters
Quantum Chromodynamics and Particle Interactions
article

Study of the Magnetic Dipole Transition of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:mi>γ</mml:mi> <mml:msub> <mml:mi>η

G. Tonani, M. Maggiora, F. Hanisch, M. Wolke, A. Calcaterra, P. Egorov, Thomas Johansson, A. Bortone, Yun Yue, Sofia Pacetti, R. Aliberti, M. Berłowski, Xi Kui, N. Salone, R. Farinelli, Yuan Liu, Joshua Jackson, S. Garbolino, A. Sarantsev, W. Kühn, C. W. Wang, I. Garzia, Y. M., Shubo Jin, Yury Anatolevich Nefedov, Li P. R., S. Gramigna, Shafaq Nisar, M. Fritsch, Qianqian Lan, A. Limphirat, K. Begzsuren, H. Zhang, Y. Schelhaas, Jin Zhang, T. Lenz, N. Kalantar‐Nayestanaki, R. Q., Marina Maggiora, Klaus Peters, Stefano Sosio, Max Lellmann, Frank Nerling, Lu Liu, S. Kabana, V. Prasad, Igor Denysenko, I. Mackay, Y. P. Lu, A. Guskov, Frederik Weidner, A. Rivetti, I. R. Boyko, J. Libby, S. Malde, S. Marcello, P. Musiol, H. L., J. Gutierrez, M. B. Bertani, H.-R. Bao, Anonymous, D. X. Lin, M. Greco, N. Hüsken, C. F. Qiao, H. M. Hu, X. Zeng, G. Li, K. L. Li, H. R. Zhang, Y. C. Yu, F. A. Harris, J. P. Zheng, L. W. Wang, Y. P. Liao, W. P. Yan, K. J. Xie, J. F. Sun, W. X. Gong, Y. L. Xiao, G. S. Huang, J. Q. Zhou, T. Liu, Y. B. Liu, S. Zhou, Y. P. Huang, J. Fang, X. C. Ai, J. L. Ma, W. T. Liu, W. G. Li, X. Y. Chai, J. Rademacker, L. Gong, B. X. Zhang, X. R. Lyu, Z. J. Ye, S. A. Cetin, S. J. Chen, C. Wang, G. Felici, M. X. Luo, S. J. Jiang, S. H. Zhu, K. J. Zhu, Y. H. Meng, G. Chen, A. Brueggemann, X. B. Ji, S. L. Hu, C. H. Li, R. J. Yang, W. B. Qian, S. Qian, Y. F. Yang, C. J. Tang, Huihui Liu, Z. Y. Yuan, M. Qi, C. Geng, A. Marshall, Y. C. Sun, J. J. Wang, Lei Li, F. H. Heinsius, X. Y. Liu, A. Kupsc, J. L. Fu, S. X. Li, Junhao Yin, Y. T. Feng, H. Y. Xu, M. H. Liu, C. F. Redmer, Jianyu Zhang, M. G. Zhao, Y. J. Wu, D. H. Zhang, J. H. Feng, H. X. Yang, J. H. Zou, A. A. Zafar, H. P. Peng, W. J. Zheng, J. F. Hu, X. L. Luo, L. B. Liao, M. H. Ye, S. Plura, Y. Tian, Y. B. Zhao, N. Yu. Muchnoi, L. Ge, J. F. Qiu, K. X. Huang, X. L. Kang, X. H. Xie, J. H. Qiao, Y. Pan, A. Q. Guo, X. C. Lou, R. P. Guo, Q. M. Ma, L. Q. Qin, Z. Ning, S. S. Sun, J. D. Gong, Chao Chen, J. Zu, L. Yuan, W. D. Zhu, Y. H. Xie, K. Sun, Z. P. Xie, Z. G. Zhao, M. Pelizaeus, G. Y. Hou, P. B. Qin, H. Xiao, J. S. Luo, H. N. Li, Y. Jiang, X. K. Zhou, T. Yang, L. Y. Tao, J. Z. Zhao, X. Y. Zhai, S. M. Wu, H. Miao, Y. C. Zhu, H. L. Song, K. Y. Liu, G. M. Liu, C. H. Heinz, C. D. Fu, L. B. Guo, M. Wang, C. Q. Deng, B. C. Ke, X. D. Yu, Q. L. Niu, M. H. Liao, C. Wu, Y. T. Liang, G. Wilkinson, J. J. Qin, E. M. Gersabeck, J. X. Teng, I. B. Nikolaev, J. S. Yu, X. R. Zheng, J. K. Jiao, L. Sun, X. P. Xu, N. Zhao, H. J. Wang, D. M. Li, X. S. Jiang, J. L. Shi, R. Li, M. Q. Ruan, Ke Liu, T. Sun, G. Rong, F. Rosini, G. Yu, Shunan Zhang, H. S. Chen, Z. S. Xu, D. Bettoni, S. H. Zhang, J. Yuan, N. Y. Wang, W. L. Xu, D. Y. Wang, H. Y. Yan, Q. Liu, Y. X. Zhou, H. Yuan, T. T. Lei, W. H. Shen, P. C. Jiang, W. Ji, C. Z. Yuan, Z. Q. Liu, Z. Y. You, H. Zhou, A. Denig, X. X. Ding, S. L. Olsen, Y. Q. Fang, H. Shi, X. Pan, R. Kiuchi, X. B. Gao, H. Liang, T. Hussain, M. C. Du, R. Y. Zhang, X. T. Hou, X. F. Wang, T. Luo, Z. Y. Zhang, S. P. Wen, J. J. Cui, Q. Y. Zhang, F. Li, J. B. Liu, J. Muskalla, H. Cai, D. Dedovich, Y. J. Su, K. D. Hao, R. Y. Ma, T. Yu, T. Z. Song, T. Y. Li, U. Wiedner, A. Gilman, Z. H. Lu, J. G. Lu, G. F. Fan, S. S. Fang, W. Shan, E. Bianco, Z. J. Xiao, Y. C. Xu, C. X. Liu, F. Yan, M. N. Achasov, Q. P. Ji, M. H. Li, T. J. Jiang, Y. Yuan, M. H. Gu, A. Amoroso, H. F. Shen, X. H. Wu, M. J. Guo, L. Xia, Y. Jin, X. H. Mo, Z. Y. Li, J. Cottee-Meldrum, F. M. Melendi, L. Fava, Z. X. Meng, N. Zhang, C. P. Shen, X. M. Zhang, H. Gao, B. Moses, Y. Bai, S. K. Choi, Yi Wang, Z. K. Jia, X. T. Huang, Lei Zhang, Y. T. Gu, T. J. Wang, P. T. Ge, P. L. Liu, Y. K. Heng, Wei Wang, Yuan Wang, C. H. Chen, L. Yan, X. J. Peng, F. Stieler, X. H. Li, S. S. Su, Z. M. Hu, Q. Ouyang, X. Chu, F. Bianchi, Y. R. Hou, J. F. Chang, T. D. Xu, A. N. Zhu, K. L. Han, X. Cai, S. S. Rong, Q. An, Q. M. Li, R. P. Zhao, X. Dong, Y. P. Guo, Y. J. Mao, C. Q. Feng, O. B. Kolcu, H. J. Lu, R. E. Mitchell, X. Q. Hao, T. Ma, Yaqian Wang, L. Zhao, W. P. Wang, D. Xiao, S. Spataro, L. S. Nie, L. C. Liu, X. T. Chen, Z. J. Shang, X. T. Ma, Lianjie Wu, Y. Ban, N. Cao, X. Q. Yan, V. Batozskaya, A. Khoukaz, J. F. Shangguan, J. L. Ping, F. C. Ma, N. Kumar, S. H. Zeng, G. Y. Xiao, K. Y. Shan, G. Y. Zhang, Y. H. Zhang, H. X. Mao, H. B. Jiang, Z. P. Mao, Y. X. Song, L. Y. Dong, M. C. Yu, L. Q. Lin, F. X. Lu, A. Pathak, C. Normand, L. X. Zhu, C. C. Lin, Z. L. Hou, Y. X. Ding, T. T. Han, L. L. Ma, C. Herold, T. J. Zhu, Y. A. Tang, M. H. Cai, J. H. Yang, Y. J. Zeng, L. J. Li, Hui Li, X. Q. Yuan, P. Adlarson, R. G. Ping, Z. W. Ge, X. Y. Shen, D. H. Wei, C. L. Luo, M. Kavatsyuk, Y. P. Li, P. L. Li, G. F. Cao, N. Berger, Y. N. Gao, H. R. Qi, K. Wang, L. Q. Huang, B. M. Zheng, M. Rolo, B. Zhong, X. Y. Zhuang, R. A. Briere, I. Uman, P. C. Hong, K. Schoenning, L. Feng, Y. H. Fan, B. Wang, T. Lin, Z. F. Tian, Q. A. Malik, S. B. Liu, M. Kuessner, B. Kopf, Ch. Rosner, A. Dbeyssi, T. Hu, X. M. Xian, G. Zhao, Q. P. Hu, H. K. Sun, G. Y. Tang, Y. J. Wang, Y. F. Lyu, Y. Hu, C. X. Yu, C. F. Xu, C. Xie, Y. H. Zhan, W. D. Niu, H. M. Liu, T. Y. Xing, S. Wang, J. J. Fan, S. Y. Shi, P. Zhang, W. N. Lan, B. H. Xiang, C. X. Yue, L. F. Tang, Bo Wang, B. X. Liu, W. M. Song, G. F. Xu, G. X. Sun, Q. N. Xu, X. P. Qin, X. Y. Ma, H. R. Wei, M. Scodeggio, J. F. Wu, J. Zhu, F. Cossio, Z. Y. Deng, F. H. Liu, L. Q. Yu, B. X. Yu, L. H. Wu, C. Zhong, Z. Wu, R. E. de Boer, T. J. Min, F. Z. Qi, Y. Y. Peng, S. X. Du, Y. H. Lu, Y. P. Pei, Z. J. Chen, D. Jiang, Y. R. Wen, M. Shao, S. J. Zhao, Zh. Zh. Zhang, H. L. Dai, Feng Liu, J. J. Tang, A. Q. Zhang, Z. H. Qin, B. Ding, B. A. Shi, Y. Q. Chen, G. R. Che, W. H. Tian, J. R. Li, J. P. Dai, F. E. Maas, Q. X. Feng, N. in der Wiesche, L. G. Shao, Y. H. Zheng, Z. Y. Lv, Y. Y. Duan, K. K. He, Z. Q. Wang, Z. H. Qu, Shulei Zhang, S. C. Yuan, Z. Q. Sun, J. J. Song, M. Q. Jing, J. Dong, X. Shi, M. Xu, P. Huang, M. Y. Dong, Y. Y. Ji, V. Khachatryan, X. Y. Shan, L. M. Zhang, X. L. Lu, C. Y. Guan, W. X. Fang, J. Y. Tian, G. R. Liao, J. S. Zhang, X. M. Jing, Y. W. Fu, M. L. Chen, Z. A. Zhu, Z. Jiao, T. Chen
article en

Abstract

Using (10.087±0.044)×10^{9} J/ψ events collected with the BESIII detector at the e^{+}e^{-} BEPCII collider, we present the first amplitude analysis of J/ψ→γpp[over ¯] with the pp[over ¯] invariant mass in the η_{c} mass region [2.70,3.05] GeV/c^{2}. The product branching fraction B(J/ψ→γη_{c})×B(η_{c}→pp[over ¯]) is determined to be (2.11±0.02_{stat}±0.07_{syst})×10^{-5} with precision improved by 1 order of magnitude. Combining with the product branching fractions B(η_{c}→pp[over ¯])×B(η_{c}→γγ) and B(J/ψ→γη_{c})×B(η_{c}→γγ), the branching fractions of B(J/ψ→γη_{c}) and B(η_{c}→γγ) are calculated to be (2.29±0.01_{stat}±0.04_{syst}±0.18_{opbf})% and (2.28±0.01_{stat}±0.04_{syst}±0.18_{opbf})×10^{-4}, respectively, which are consistent with the latest lattice quantum chromodynamics calculations. Here, opbf is the uncertainty from the other product branching fractions used in the calculation.

Physical Review LettersVol. 136(5)
University of Science and Technology Liaoning (CN), Liaoning University (CN), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), Uppsala University (SE), University of Science and Technology of China (CN), University of Hawaii System (US), Mongolian Academy of Sciences (MN), Central South University (CN), Guangxi University (CN), Nanjing Normal University (CN), Liaoning Normal University (CN), North China Electric Power University (CN), Shandong University (CN), COMSATS University Islamabad (PK), Hangzhou Normal University (CN), Hunan University (CN), Henan University of Science and Technology (CN), University of Groningen (NL), GSI Helmholtz Centre for Heavy Ion Research (DE), University of the Punjab (PK), Hunan Normal University (CN), Henan University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), University of Tarapacá (CL), Guangxi University of Science and Technology (CN), South China Normal University (CN), Yunnan University (CN), Jilin University (CN), Johannes Gutenberg University Mainz (DE), Justus-Liebig-Universität Gießen (DE), University of Ferrara (IT), Qufu Normal University (CN), Peking University (CN), Nankai University (CN), University of Münster (DE), Sichuan University (CN), Indian Institute of Technology Madras (IN), Fudan University (CN), Inner Mongolia University (CN), University of Perugia (IT), Shandong Normal University (CN), University of Manchester (GB), Guangxi Normal University (CN), China University of Geosciences (CN), Huangshan University (CN), Joint Institute for Nuclear Research (RU), University of Jinan (CN), Henan University of Technology (CN), University of Bristol (GB), Wuhan University (CN), Zhengzhou University (CN), University of Oxford (GB), Central China Normal University (CN), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Helmholtz Institute Mainz (DE), Istinye University (TR), Institute of Modern Physics (CN), Jilin Medical University (CN), Shanxi University of Traditional Chinese Medicine (CN), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Piedmont University (US), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Hebei University (CN), Budker Institute of Nuclear Physics (RU), China Center of Advanced Science and Technology (CN), University of Turin (IT), Indiana University (US), Chung-Ang University (KR), Near East University (CY), Carnegie Mellon University (US), Henan Normal University (CN), Zhejiang University (CN), Lanzhou University (CN), Renmin University of China (CN), Suranaree University of Technology (TH), Beihang University (CN), Nanjing University (CN), Ruhr University Bochum (DE), University of South China (CN), Shanxi Normal University (CN), Tsinghua University (CN)
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