Study of ψ(3686)→π0h c, h c→γη c via η c exclusive decays

Medina Ablikim,M. N. Achasov,O. Albayrak,David J. Ambrose,F. F. An,Q. An,J. Z. Bai,Y. Ban,Julia K. Becker,J. V. Bennett,Monica B. Bertani,J. M. Bian,E. Boger,Olga A. Bondarenko, I. R. Boyko,Roy A. Briere,Vladimir V. Bytev,X. Cai,Orhan Çakír,A. C. Calcaterra,G. F. Cao,Serkant A. Çetin,J. F. Chang,Georgy A. Chelkov,Guomeng Chen,Hesheng Chen,Jin Chen, M. L. Chen, S. J. Chen,Xuzong Chen,Yu Chen,H. P. Cheng,Y. P. Chu,Daniel P. Cronin-Hennessy,H. L. Dai,J. P. Dai,Dmitri V. Dedovich,Z. Y. Deng,Achim G. Denig,I. Denysenko,M. F. Destefanis,W. M. Ding,Y. Ding, L. Y. Dong,Mingyi Dong,S. X. Du,Jian Fang,Shuangshi Fang,Luciano Fava,F. Feldbauer,Chen Feng,Rinaldo Baldini Ferroli,Chedong Fu, J. L. Fu,Y. Gao,C. Geng,K. Goetzen,W. X. Gong,W. Gradl,M. Greco,M. H. Gu,Y. T. Gu, Y. H. Guan,Aiqiang Guo,L. B. Guo,Y. P. Guo,Y. L. Han,Frederick A. Harris,Kanglin He,Mao He,Z. Y. He,T. Held,Yuekun Heng,Z. L. Hou,H. M. Hu,Tao Hu,G. M. Huang,G. S. Huang,Jinshu Huang,X. T. Huang,Y. P. Huang,Talib A. Hussain,Changsheng Ji,Qingping Ji,Q. P. Ji,Xiaobini Ji,X. L. Ji,L. L. Jiang,X. S. Jiang,J. B. Jiao, Z. Jiao,Dan Jin,Shan Jin,F. F. Jing,Nasser Kalantar-Nayestanaki,M. O. Kavatsyuk,Wolfgang Kuehn,W. Lai,Jens Sören Lange,Chun Li,Cheng Li, Cui Li,D. M. Li,Fei Li,Gang Li,Haibo Li,Jiacai Li,Kang Li,Lei Li, Q. J. Li, Sheng Li,W. D. Li,W. G. Li,Xianlei Li,Xiaonan Li,Xueqian Li,Xiurong Li,Zhibing Li,Han Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,X. T. Liao,BeiJiang Liu, Chao Liu,C. X. Liu,Cheng Liu,FuHu Liu,Fang Liu,Feng Liu,Hongwei Liu,Huihui Liu,HuaiMin Liu,H. W. Liu,Jia Liu,Kai Liu,P. L. Liu,Q. Liu,Shaobo Liu,X. E. Liu,Yubin Liu,Zhen'An Liu,Zhiqiang Liu,Zhiqing Liu,Herbert Loehner,G. R. Lu,H. J. Lu,Junguang Lü,Qiwen Lü,X. R. Lu,Yunpeng Lu, C. L. Luo,Minxing Luo,T. Luo,X. L. Luo,M. Lv,C. L. Ma,F. C. Ma,H. L. Ma, Q. M. Ma,Shuo Ma,T. Ma,X. Y. Ma,Y. Ma,Frank E. Maas,Marco Maggiora,Q. A. Malik,YaJund Mao,Zepu Mao,Johan G M Messchendorp,J. Min,T. J. Min,Ryan E. Mitchell,Xiaohu Mo,Cornelio Morales Morales,C. Motzko,Nikolay Yu Muchnoi,H. Muramatsu,Yu A. Nefedov,Caitriana Nicholson,Ivan B. Nikolaev,Z. Ning,Stephen Lars Olsen,Qun Ouyang,Simone Pacetti,Jewook Park,M. Pelizaeus,H. P. Peng,Klaus J. Peters,Jialun Ping,Ronggang Ping,Ronald A. Poling,E. Prencipe,Ming Qi,S. Qian,C. F. Qiao,Xiaoshuai Qin,Y. Qin,Z. H. Qin,J. F. Qiu,K. H. Rashid,Gang Rong,Xiangdong Ruan,Andrey V. Sarantsev,B. D. Schaefer, J. Schulze,Shao Ming,C. P. Shen,Xiaoyan Shen,Huayi Sheng,Matthew R. Shepherd,X. Y. Song,Stefano Spataro,Björn Spruck,D. H. Sun,G. X. Sun, J. F. Sun,Sbengsen Sun,YongJie Sun,Yi Sun, Z. J. Sun,Z. T. Sun,C. J. Tang,X. W. Tang,Ilhan Tapan,Edward H. Thorndike,Derrick Toth,Matthias Ullrich,Gary S. Varner,Bing Wang,Boqun Wang,Daliang Wang,Duan Wang,K. Wang,Liang Wang,Lan Wang,Meng Wang,P. Wang,P. L. Wang,Qun Wang,Q. J. Wang,Shiguang Wang,Xiaolong Wang,Yandong Wang,Yifang Wang,Yongqiang Wang,Zhe Wang,Zhigang Wang,Zheng Wang,D. H. Wei,Jiangbo Wei,P. Weidenkaff,Q. G. Wen,ShuoPini Wen,Marcel W. Werner,Ulrich Wiedner,Linghui Wu,N. Wu,S. X. Wu,W. Wu,Zhonghuan Wu,L. G. Xia,Z. J. Xiao,Y. G. Xie, Q. L. Xiu,Gang Xu,G. M. Xu,Haisheng Xu,Qing Xu,X. P. Xu,Zhirui Xu,F. Xue,Zhen Xue,Lei Yan,W. B. Yan,Y. H. Yan,Hai Yang,Yadong Yang,Yongxu Yang,H. Ye,M. Ye,M. H. Ye,Boxiang Yu,C. X. Yu,H. W. Yu,Jiesheng Yu,S. P. Yu,Changzheng Yuan,Yo Yuan,Abrar Ahmed Zafar,Adriano Z. Zallo,Yun Zeng,B. X. Zhang,B. Y. Zhang, C. Y. Zhang,Changchun Zhang,D. H. Zhang, Hui Zhang,Hongyu Zhang,Jian Zhang,Jiawen Zhang,Jing Zhang,S. H. Zhang,Xuan Zhang,Xueyao Zhang, Yi Zhang,Ying Zhang,Yao Zhang,Ziping Zhang,Zhenyu Zhang,Guangyuan Zhao,H. S. Zhao, J. W. Zhao,Kan Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,Qiang Zhao, Quiang Zhao,S. J. Zhao,Tianchi Zhao,Xin Zhao,YuBin Zhao,Z. G. Zhao,Alexey S. Zhemchugov,B. Zheng,Jianping Zheng,Yanghenghtl Zheng,Bin Zhong,J. Zhong,Zhi'an Zhong,Lin Zhou,X. K. Zhou, X. R. Zhou,C. Zhu,K. J. Zhu,S. H. Zhu,X. L. Zhu, Y. C. Zhu,Y. M. Zhu, Y. S. Zhu,Zian Zhu,J. Zhuang,B. S. Zou,Jiaheng Zou

PHYSICAL REVIEW D（2012）

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摘要

The process psi(3686) -> pi(0)h(c), h(c) -> gamma eta(c) has been studied with a data sample of 106 +/- 4 million Psi(3686) events collected with the BESIII detector at the BEPCII storage ring. The mass and width of the P-wave charmonium spin-singlet state h(c)(P-1(1)) are determined by simultaneously fitting distributions of the pi(0) recoil mass for 16 exclusive eta(c) decay modes. The results, M(h(c)) 3525.31 +/- 0.11(stat) +/- 0.14(syst) MeV/c(2) and Gamma(h(c)) = 0.70 +/- 0.28 +/- 0.22 MeV, are consistent with and more precise than previous measurements. We also determine the branching ratios for the 16 exclusive eta(c) decay modes, five of which have not been measured previously. New measurements of the eta(c) line- shape parameters in the E1 transition h(c) -> gamma eta(c) are made by selecting candidates in the h(c) signal sample and simultaneously fitting the hadronic mass spectra for the 16 eta(c) decay channels. The resulting eta(c) mass and width values are M(eta(c)) = 2984.49 +/- 1.16 +/- 0.52 MeV/c(2) and Gamma(eta(c)) 36.4 +/- 3.2 +/- 1.7 MeV.

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