Observation of ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ.

Abstract

Using 4.479×10^{8}  ψ(3686) events collected with the BESIII detector, we search for the decays ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ, where J=0, 1, 2. The decays ψ(3686)→e^{+}e^{-}χ_{cJ} and χ_{cJ}→e^{+}e^{-}J/ψ are observed for the first time. The measured branching fractions are B(ψ(3686)→e^{+}e^{-}χ_{cJ})=(11.7±2.5±1.0)×10^{-4}, (8.6±0.3±0.6)×10^{-4}, (6.9±0.5±0.6)×10^{-4} for J=0, 1, 2, and B(χ_{cJ}→e^{+}e^{-}J/ψ)=(1.51±0.30±0.13)×10^{-4}, (3.73±0.09±0.25)×10^{-3}, (2.48±0.08±0.16)×10^{-3} for J=0, 1, 2, respectively. The ratios of the branching fractions B(ψ(3686)→e^{+}e^{-}χ_{cJ})/B(ψ(3686)→γχ_{cJ}) and B(χ_{cJ}→e^{+}e^{-}J/ψ)/B(χ_{cJ}→γJ/ψ) are also reported. Also, the α values of helicity angular distributions of the e^{+}e^{-} pair are determined for ψ(3686)→e^{+}e^{-}χ_{c1,2} and χ_{c1,2}→e^{+}e^{-}J/ψ.

DOI: 10.1103/PhysRevLett.118.221802

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@article{Ablikim2017ObservationO, title={Observation of ψ(3686)→e^\{+\}e^\{-\}χ_\{cJ\} and χ_\{cJ\}→e^\{+\}e^\{-\}J/ψ.}, author={Melike Ablikim and M . N . Achasov and X. C. Ai and Onur Albayrak and Marcus Albrecht and Divakar Justus Ambrose and Antonio Amoroso and Fengpeng An and Qi An and Jing Bai and R B F Baldini Ferroli and Yoshitsune Ban and David W. Bennett and John V. Bennett and M. B. Bertani and Diego Bettoni and Jian-min Bian and Francesca Bianchi and Elin Boger and Igor Boyko and R . A . Briere and H C Cai and X . Z . Cai and Orhan Cakir and Andrea Calcaterra and Gang Cao and S. A. Çetin and J . F . Chang and G . A . Chelkov and Gui-ping Chen and Huan Chen and H . Y . Chen and Joseph Chen and M Chen and S Chen and Xu Chen and Xue Rong Chen and Y Chen and Heping Cheng and X K Chu and Gianluigi Cibinetto and H. L. Dai and Jian Dai and A . Dbeyssi and D . V . Dedovich and Zhiting Deng and Achim G. Denig and I B Denysenko and Marco Destefanis and F De Mori and Yang Ding and C Dong and Jun Dong and Lin Dong and M. Dong and Zhi-yong Dou and S. X. Du and Piaopiao Duan and J. Fan and Jinggui Fang and S Fang and Xiang Fang and Yi Fang and Ruben Farinelli and Luciano Fava and O . E . Fedorov and F . Feldbauer and G. Felici and Chao Feng and Emiliano Fioravanti and Marl{\`e}ne Fritsch and C Fu and Q X Gao and Xiu Lai Gao and Xiao Yan Gao and Y. Gao and Z L Gao and I . Garzia and Klaus Goetzen and L M Gong and W. X. Gong and Wolfgang Gradl and Massimo Greco and Mai Gu and Yan Gu and Yue Guan and Author Guo and L. Guo and R Guo and Yue Guo and Z. Haddadi and Annette Hafner and S. H. Han and Xishan Hao and Frederick A. Harris and Kan Lian He and Theo Held and Yee Kiat Heng and Zhonghuai Hou and Chunhong Hu and H Hu and Jin Hu and Ting Hu and Y Hu and G. Steven Huang and Justin Huang and X Huang and Xiaozhu Huang and Yining Huang and Z Huang and Tajdar Hussain and Qingqiang Ji and Xue Ji and Xiangdong Ji and L Jiang and Xiaoyin Sara Jiang and X Y Jiang and Jian Jiao and Zhi-jun Jiao and Da Peng Jin and Seong Lim Jin and Tord Johansson and Arttu Julin and Nasser Kalantar-Nayestanaki and Xue Liang Kang and Xiaotao Kang and M . O . Kavatsyuk and B. C. Ke and Prof. Dr. Manfred Kiese and R . Kliemt and Birgitt Kloss and O. B. Kolcu and B . Kopf and M. Kornicer and Andrzej Kupś{\'c} and William P . Kuehn and Jens S{\"{o}ren Lange and Manuel Lara and Penny Larin and Chunhong Leng and Cui Li and Cheng Li and D. Li and F. Li and Guang Li and L Li and Haitao Li and Ji-cheng Li and Jin Li and K Li and Lei Li and Peijun Liu and Qiangxiang Li and T Li and W Li and W. Li and Xuemin Li and X . N . Li and X . Q . Li and Y Li and Z . B . Li and Hailong Liang and Y. Liang and Y. T. Liang and G. R. Liao and D-c Lin and B Liu and Cheng Chih Liu and Dan Liu and Frank Liu and Fang Liu and Feng Liu and H. B. Liu and Helen Liu and H. M. Liu and Jun Liu and J . B . Liu and J . Y . Liu and Kai Liu and L. Liu and P. L. Liu and Q Liu and S. Liu and X Liu and Yin Liu and Zhiqing Liu and Herbert Loehner and Xiaoxia Lou and He Jun Lu and Juan Lu and Y. Lu and Chun Luo and Millore X-M Luo and Tianci Luo and Xuan Luo and Xujian Lyu and Fu Chan Ma and Hoang L Ma and Li Ma and Mingsheng Ma and Qiang Ma and Tammy Ma and Xi nian Ma and Xiaodong Ma and Y Ma and F. E. Maas and Marcello Maggiora and Y. Mao and Zhiping Mao and Sandra Marcello and Johan G. Messchendorp and Jin Min and Reginald E. Mitchell and Xiao-yang Mo and Y. J. Mo and C A Morales Morales and N . Yu . Muchnoi and Hideki Muramatsu and Yu . Nefedov and Frank Nerling and I. B. Nikolaev and Z Ning and Saleha Nisar and Shuangxia Niu and X Y Niu and Sharon L. Olsen and Qi Ouyang and Simone Pacetti and Y Pan and Paola Patteri and M. Pelizaeus and H. Peng and Keith Peters and Janette Pettersson and Jia - Lun Ping and R . - G . Ping and Ron Poling and Valmiki Prasad and Hongbo Qi and Min Qi and Sujuan Qian and Chun Feng Qiao and Li Qin and Ning Qin and Xuezhong Qin and Zheng Qin and Jing Qiu and Khalid H. Rashid and Ch . F . Redmer and M D Ripka and Guobin Rong and Ch Rosner and Xiang-yan Ruan and A . V . Sarantsev and M . Savri{\'e} and K . Sch{\"{o}nning and Stefan Schumann and W . L . Shan and Ming'an Shao and C. P. Shen and Peng Shen and Xiao Shen and Huan-yuan Sheng and Mei sen Shi and Won Moon Song and X Song and S . Sosio and Stephano Spataro and Gang Sun and J. Sun and S Sun and Xing Sun and Ying Sun and Y. Sun and Zhi Sun and Z. Sun and C. Tang and Xiu Feng Tang and I Tapan and Edward H Thorndike and M . Tiemens and Matthias S. Ullrich and Ismail Uman and Gary S. Varner and Belinda Wang and D Wang and D. Y. Wang and K Wang and L. Wang and L Wang and M Wang and Philip L Wang and S. G. Wang and W Wang and Wen Wang and X Wang and Yanping Wang and Y Wang and Zheng Wang and Zhenlong Wang and Zhonghua Wang and Thomas Weber and David H. Wei and Jun Wei and P Weidenkaff and S Wen and Ulrich Wiedner and Matthias Wolke and Li-Ming Wu and Long Wu and Zhiliang Wu and Liu Xia and Y Xia and Daliao Xiao and H J Xiao and Z J Xiao and Yuehong Xie and Q L Xiu and G. F. Xu and Jijun Xu and L Xu and Qin Jun Xu and Qing Xu and X. Xu and L Yan and Wen Yan and Wen Chen Yan and Yu Yan and Heyoung Yang and H. X. Yang and Li Yang and Y. Yang and M. H. Ye and Jian Yin and B Yu and C. Yu and J S Yu and Changzheng Yuan and Weiping Yuan and Yi Yuan and A Yuncu and Azhar Ali Zafar and Adriano Zallo and Y Zeng and Z L Zeng and B. Zhang and Bao Zhang and Cheng Zhang and D Zhang and Hong Hui Zhang and Huiyuan Zhang and Jason Y. Zhang and J. J. Zhang and J Zhang and Jianyi Zhang and Jia Zhang and Kevin Zhang and L Zhang and S Zhang and X Y Zhang and Yingxin Zhang and Yin Zhang and Yuan-Ting Zhang and Yu Zhang and Z H Zhang and Zhenjun Zhang and Z Zhang and Guiping Zhao and Jingwei Zhao and Jian Zhao and J Z Zhao and Lei Zhao and Ling Zhao and Ming Zhao and Qian Zhao and Shaohua Zhao and Tongbiao Zhao and Y Zhao and Z. Zhao and A . Zhemchugov and Bin Zheng and J. Zheng and Wen Zheng and Y. Zheng and Baiyu Zhong and Lingli Zhou and Xian Zhou and X K Zhou and Xue Rui Zhou and K. Zhu and Shu-Hong Zhu and X. L. Zhu and Y. Zhu and Y. S. Zhu and Z. Zhu and Jian Zhuang and Lorenza Zotti and Bing-song Zou and Jun Zou}, journal={Physical review letters}, year={2017}, volume={118 22}, pages={221802} }