Search for the rare decays , , and |
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| Institution: | aInstitute of High Energy Physics, Beijing 100049, People's Republic of China;bChina Center for Advanced Science and Technology (CCAST), Beijing 100080, People's Republic of China;cGSImbh Darmstadt, Darmstadt 64291, Germany;dGuangxi Normal University, Guilin 541004, People's Republic of China;eGuangxi University, Nanning 530004, People's Republic of China;fHenan Normal University, Xinxiang 453002, People's Republic of China;gHuazhong Normal University, Wuhan 430079, People's Republic of China;hHunan University, Changsha 410082, People's Republic of China;iJinan University, Jinan 250022, People's Republic of China;jLiaoning University, Shenyang 110036, People's Republic of China;kNanjing Normal University, Nanjing 210097, People's Republic of China;lNankai University, Tianjin 300071, People's Republic of China;mPeking University, Beijing 100871, People's Republic of China;nShandong University, Jinan 250100, People's Republic of China;oSichuan University, Chengdu 610064, People's Republic of China;pTsinghua University, Beijing 100084, People's Republic of China;qUniversity of Hawaii, Honolulu, HI 96822, USA;rUniversity of Science and Technology of China, Hefei 230026, People's Republic of China;sWuhan University, Wuhan 430072, People's Republic of China;tZhejiang University, Hangzhou 310028, People's Republic of China |
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| Abstract: | Rare decay modes  , J/ψ→D−π++c.c., and  are searched for using  events collected with the BESII detector at the BEPC. No signal above background is observed. We present upper limits on the branching fractions of  , B(J/ψ→D−π+)<7.5×10−5, and  at the 90% confidence level. |
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