J. Z. Bai,J. G. Bian,I. Blum,Z. Chai,Guiliang Chen,H. F. Chen,Jiping Chen,Jinxuan Chen,Yilin chen,Y. B. Chen,Y. Q. Chen,B. S. Cheng,X. Z. Cui,H. L. Ding,L. Ding,Dong Liu,Z. Z. Du,W. Dunwoodie,S. H. Feng,C. S. Gao,M. Gao,S. Q. Gao,P. Gratton,JH Gu,S. Gu,W. X. Gu,Y. F. Gu,Y. N. Guo,S. W. Han,Y. L. Han,F. A. Harris,J. He,J. He,Miao He,D. G. Hitlin,G. Y. Hu,H. M. Hu,J. L. Hu,Qin Hu,T. Hu,X. Q. Hu,J. D. Huang,Yizhong Huang,J. M. Izen,C. H. Jiang,Y. Jin,Z. J. Ke,M. H. Kelsey,B. K. Kim,D. Kong,Y. F. Lai,P. F. Lang,A. J. Lankford,Changze Li,D. Li,Hailin Li,J. Li,Peiyao Li,R. B. Li,W. Li,W. D. Li,Wang Li,X. H. Li,X. N. Li,H. M. Liu,J. Liu,J. H. Liu,R. G. Liu,Y. Liu,X. C. Lou,B. Lowery,F. X. Lu,J. G. Lu,Jie Lu,L. C. Lu,C. H. Luo,A. M.,E. C.,J. M.,R. Malchow,H. S. Mao,Z. P. Mao,X. C. Meng,J. Nie,S. L. Olsen,J. Oyang,D. Paluselli,Pan Lu,J. Panetta,F. C. Porter,N. D. Qi,X. R. Qi,C. D. Qian,J. F. Qiu,Y. H. Qu,Y. K. Que,G. Rong,M. Schernau,Y. Shao,B. W. Shen,D. L. Shen,H. F. Shen,X. Y. Shen,H. Y. Sheng,H. Z. Shi,X. Song,J. Standifird,F. Sun,H. Sun,S. Q. Tang,W. H. Toki,G. L. Tong,G. Varner,Fei Wang,Lu Wang,L. Z. Wang,M. Wang,Meng Wang,P. Wang,P. L. Wang,ShuoWang Wang,Tianchun Wang,Y. Y. Wang,M. Weaver,C. Wei,Yaoguo Wu,D. M. Xi,X. M. Xia,P. P. Xie,Y. Xie,Y. Xie,W. Xiong,C. Xu,G. F. Xu,S. Xue,Jun Yan,W. G. Yan,C. Yang,C. Y. Yang,J. Yang,W. C. Yang,Xiaofei Yang,M. H. Ye,S. W. Ye,Y. X. Ye,K. Yi,Yu Chen,C. X. Yu,Y. H. Yu,Yu Z,Z. Yu,C. Z. Yuan,Y. Yuan,B. Y. Zhang,C. C. Zhang,D. H. Zhang,Dehong Zhang,H. L. Zhang,J. Zhang,J. L. Zhang,J. W. Zhang,L. S. Zhang,Q. J. Zhang,S. Q. Zhang,X. Y. Zhang,Y. Zhang,Y. Y. Zhang,Dongxu Zhao,H. W. Zhao,Jiawei Zhao,M. G. Zhao,W. R. Zhao,Z. G. Zhao,J. P. Zheng,Lei Zheng,Z. P. Zheng,G. P. Zhou,Hai-Qing Zhou,Zhou Li,Q. M. Zhu,Y. Zhu,Y. S. Zhu,B. A. Zhuang
Physical Review Letters（1998）
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摘要
The processes $\ensuremath{\psi}(2S)\ensuremath{\rightarrow}\ensuremath{\gamma}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}$, and $\ensuremath{\gamma}p\overline{p}$ have been studied using a sample of $3.79\ifmmode\times\else\texttimes\fi{}{10}^{6}\ensuremath{\psi}(2S)$ decays. We determine the total width of the ${\ensuremath{\chi}}_{c0}$ to be ${\ensuremath{\Gamma}}_{{\ensuremath{\chi}}_{c0}}^{\mathrm{tot}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}14.3\ifmmode\pm\else\textpm\fi{}2.0\ifmmode\pm\else\textpm\fi{}3.0\mathrm{MeV}$. We present the first measurement of the branching fraction $B({\ensuremath{\chi}}_{c0}\ensuremath{\rightarrow}p\overline{p})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(15.9\ifmmode\pm\else\textpm\fi{}4.3\ifmmode\pm\else\textpm\fi{}5.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, where the first error is statistical and the second one is systematic. Branching fractions of ${\ensuremath{\chi}}_{c0,2}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${K}^{+}{K}^{\ensuremath{-}}$ are also reported.
