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2011•Physical Review LettersOpen access

Observation of χc1 Decays into Vector Meson Pairs ϕϕ , ωω , and ωϕ

M. Ablikim, Mikhail N. Achasov, L. An, Q. An, Zhenghua An, J. Z. Bai, R. Baldini, Y. Ban, J. A. Becker, N. Berger, M. Bertani, J. M. Bian, O. Bondarenko, Igor R. Boyko, Roy A. Briere, V. Bytev, X. Z. Cai, G. F. Cao, X. X. Cao, J. F. Chang, G. Chelkov, G. Chen, H. S. Chen, J. C. Chen, M. L. Chen, S. J. Chen, Y. Chen, Y. B. Chen, H. P. Cheng, Y. P. Chu, D. Cronin-Hennessy, H. L. Dai, J. P. Dai, D. V. Dedovich, Z. Y. Deng, I. Denysenko, Marco Giovanni Maria Destefanis, Y. Ding, L. Y. Dong, M. Y. Dong, S. X. Du, Mai-Ying Duan, Ruirui Fan, J. Fang, S. S. Fang, C. Q. Feng, C. D. Fu, J. Fu, Y. Gao, Chao-liang GENG, K. Goetzen, W. X. Gong, M. Greco, Sergey V. Grishin, M. H. Gu, Y. T. Gu, Y. Guan, A. Q. Guo, L. B. Guo, Y. P. Guo, X. Q. Hao, Frederick A. Harris, K. L. He, Mengxuan He, Z. Y. He, Y. K. Heng, Z. L. Hou, H. M. Hu, J. F. Hu, J. F. Hu, Bin Huang, G. M. Huang, J. S. Huang, X. T. Huang, Y. Huang, T. Hussain, C. S. Ji, Q. P. Ji, X. B. Ji, X. L. Ji, Lu Jia, Lijun Jiang, X. S. Jiang, J. B. Jiao, Z. Jiao, D. P. Jin, S. Jin, F. Jing, M. Kavatsyuk, S. Komamiya, W. Kuehn, Jens Sören Lange, J. K. C. Leung, Cheng Li, Cui Li, D. M. Li, Fenfang Li, G. Li, Huaan Li, J. C. Li, Lei Li, Na Li, Qibo Li, W. D. Li, W. G. Li, X. L. Li, X. N. Li, X. Q. Li, X. R. Li, Z. B. Li, H. Liang, Y. F. Liang, Y. T. Liang, G. R. Liao, X. T. Liao, B. J. Liu, B. J. Liu, C. L. Liu, C. X. Liu, C. Y. Liu, F. H. Liu, Fang Liu, Feng Liu, G. C. Liu, H. Liu, H. B. Liu, H. M. Liu, Haoyang Liu, J. P. Liu, K. Liu, K. Y. Liu, Q. Liu, S. B. Liu, X. Liu, X. H. Liu, Y. B. Liu, Y. W. Liu, Yong Liu, Z. A. Liu, Z. Q. Liu, H. Loehner, G. R. Lu, H. J. Lu, J. G. Lu, Q. W. Lu, X. R. Lu, Y. P. Lu, C. L. Luo, M. X. Luo, T. Luo, X. L. Luo, C. L., F. C. Ma, H. L. Ma, Q. M., Teng Ma, X. Y. Ma, X. Y. Ma, Marco Maggiora, Q. A. Malik, He Mao, Y. J. Mao, Z. P. Mao, Johan G. Messchendorp, Jie Min, R. E. Mitchell, X. H. Mo, N. Yu. Muchnoi, Yevhen Nefedov, Z. Ning, S. L. Olsen, Q. Ouyang, S. Pacetti, M. Pelizaeus, Κ. Peters, J. L. Ping, R. G. Ping, Ronald A. Poling, C. S. J. Pun, M. Qi, Si-Jin Qian, C. F. Qiao, X. S. Qin, J. F. Qiu, K. H. Rashid, Gan Rong, X. D. Ruan, A. Sarantsev, Julian Schulze, M. Shao, C. P. Shen, X. Y. Shen, H. Y. Sheng, M. R. Shepherd, Y. X. Song, S. Sonoda, S. Spataro, B. Spruck, D. H. Sun, G. X. Sun, J. F. Sun, S. S. Sun, X. Sun, Y. J. Sun, Y. Z. Sun, Z. J. Sun, Z. T. Sun, C. J. Tang, X. Tang, Xiaodan Tang, H. L. Tian, D. Toth, G. S. Varner, X. Wan, B. Q. Wang, K. Wang, L. L. Wang, L. S. Wang, Meng Wang, P. Wang, P. L. Wang, Q. Wang, S. G. Wang, X. L. Wang, Y. D. Wang, Y. F. Wang, Y. Q. Wang, Z. Wang, Z. G. Wang, Z. Y. Wang, D. H. Wei, Q. G. Wen, S. P. Wen, U. Wiedner, L. H. Wu, N. Wu, Wan-Chen Wu, Z. Wu, Z. J. Xiao, Y. G. Xie, G. F. Xu, Guofa Xu, H. Xu, Y. Xu, Z. R. Xu, Z. Z. Xu, Z.L. Xue, L. Yan, W. B. Yan, Y. H. Yan, H. X. Yang, Min Jae Yang, Tao Yang, Y. Yang, Y. X. Yang, M. Ye, M. H. Ye, B. X. Yu, C. X. Yu, Longmin Yu, C. Z. Yuan, W. L. Yuan, Y. Yuan, A. A. Zafar, A. Zallo, Y. Zeng, B. X. Zhang, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. H. Zhang, H. H. Zhang, Jianyu Zhang, J. W. Zhang, J. Y. Zhang, J. Z. Zhang, L. Zhang, S. H. Zhang, T. R. Zhang, X. J. Zhang, X. Y. Zhang, Y. Zhang, Y. H. Zhang, Z. P. Zhang, Z. Y. Zhang, G. Zhao, H. S. Zhao, Jiawei Zhao, Jingwei Zhao, Lei Zhao, Ling Zhao, M. G. Zhao, Q. Zhao, S. J. Zhao, T. Zhao, Xuancheng Zhao, Yanchuan Zhao, Z. G. Zhao, Z. L. Zhao, Alexey Zhemchugov, B. Zheng, J. P. Zheng, Yucheng Zheng, Z. P. Zheng, B. Zhong, J. Zhong, L. Zhong, Liping Zhou, Xiaoyu Zhou, X. R. Zhou, C. G. Zhu, Kaixing Zhu, K. J. Zhu, S. H. Zhu, Xianglei Zhu, X. W. Zhu, Y. S. Zhu, Z. A. Zhu, J. Zhuang, B. S. Zou, J. H. Zou, J. X. Zuo, P. Zweber

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Abstract

Using $(106\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(3686)$ events accumulated with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider, we present the first measurement of decays of ${\ensuremath{\chi}}_{c1}$ to vector meson pairs $\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$. The branching fractions are measured to be $(4.4\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $(6.0\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, and $(2.2\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, for ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$, respectively, which indicates that the hadron helicity selection rule is significantly violated in ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decays. In addition, the measurement of ${\ensuremath{\chi}}_{\mathrm{cJ}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi}$ provides the first indication of the rate of doubly OZI-suppressed ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decay. Finally, we present improved measurements for the branching fractions of ${\ensuremath{\chi}}_{c0}$ and ${\ensuremath{\chi}}_{c2}$ to vector meson pairs.

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What this paper is about

Using $(106\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(3686)$ events accumulated with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider, we present the first measurement of decays of ${\ensuremath{\chi}}_{c1}$ to vector meson pairs $\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$. The branching fractions are measured to be $(4.4\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $(6.0\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, and $(2.2\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, for ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$, respectively, which indicates that the hadron helicity selection rule is significantly violated in ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decays. In addition, the measurement of ${\ensuremath{\chi}}_{\mathrm{cJ}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi}$ provides the first indication of the rate of doubly OZI-suppressed ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decay. Finally, we present improved measurements for the branching fractions of ${\ensuremath{\chi}}_{c0}$ and ${\ensuremath{\chi}}_{c2}$ to vector meson pairs.

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Available abstract

Using $(106\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $\ensuremath{\psi}(3686)$ events accumulated with the BESIII detector at the BEPCII ${e}^{+}{e}^{\ensuremath{-}}$ collider, we present the first measurement of decays of ${\ensuremath{\chi}}_{c1}$ to vector meson pairs $\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$. The branching fractions are measured to be $(4.4\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, $(6.0\ifmmode\pm\else\textpm\fi{}0.3\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$, and $(2.2\ifmmode\pm\else\textpm\fi{}0.6\ifmmode\pm\else\textpm\fi{}0.2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, for ${\ensuremath{\chi}}_{c1}\ensuremath{\rightarrow}\ensuremath{\phi}\ensuremath{\phi}$, $\ensuremath{\omega}\ensuremath{\omega}$, and $\ensuremath{\omega}\ensuremath{\phi}$, respectively, which indicates that the hadron helicity selection rule is significantly violated in ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decays. In addition, the measurement of ${\ensuremath{\chi}}_{\mathrm{cJ}}\ensuremath{\rightarrow}\ensuremath{\omega}\ensuremath{\phi}$ provides the first indication of the rate of doubly OZI-suppressed ${\ensuremath{\chi}}_{\mathrm{cJ}}$ decay. Finally, we present improved measurements for the branching fractions of ${\ensuremath{\chi}}_{c0}$ and ${\ensuremath{\chi}}_{c2}$ to vector meson pairs.

Key concepts: Omega, Physics, Meson, Vector meson, Helicity, Particle physics, Hadron, Branching fraction

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Observation of χc1 Decays into Vector Meson Pairs ϕϕ , ωω , and ωϕ — Research Paper | ScholarLens