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arxiv: 1710.05738 · v2 · submitted 2017-10-16 · ✦ hep-ex

Recognition: unknown

Branching fraction measurement of J/psi rightarrow K_S K_L and search for J/psi rightarrow K_S K_S

BESIII Collaboration:M.Ablikim , M.N.Achasov , S. Ahmed , M.Albrecht , M.Alekseev , A.Amoroso , F.F.An , Q.An
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J.Z.Bai Y.Bai O.Bakina R.Baldini Ferroli Y.Ban D.W.Bennett J.V.Bennett N.Berger M.Bertani D.Bettoni J.M.Bian F.Bianchi E.Boger I.Boyko R.A.Briere H.Cai X.Cai O. Cakir A.Calcaterra G.F.Cao S.A.Cetin J.Chai J.F.Chang G.Chelkov G.Chen H.S.Chen J.C.Chen M.L.Chen S.J.Chen X.R.Chen Y.B.Chen Z.X.Chen X.K.Chu G.Cibinetto H.L.Dai J.P.Dai A.Dbeyssi D.Dedovich Z.Y.Deng A.Denig I.Denysenko M.Destefanis F.DeMori Y.Ding C.Dong J.Dong L.Y.Dong M.Y.Dong O.Dorjkhaidav Z.L.Dou S.X.Du P.F.Duan J.Fang S.S.Fang X.Fang Y.Fang R.Farinelli L.Fava S.Fegan F.Feldbauer G.Felici C.Q.Feng E.Fioravanti M. Fritsch C.D.Fu Q.Gao X.L.Gao Y.Gao Y.G.Gao Z.Gao B. Garillon I.Garzia K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco M.H.Gu S.Gu Y.T.Gu A.Q.Guo L.B.Guo R.P.Guo Y.P.Guo Z.Haddadi S.Han X.Q.Hao F.A.Harris K.L.He X.Q.He F.H.Heinsius T.Held Y.K.Heng T.Holtmann Z.L.Hou C.Hu H.M.Hu J.F.Hu T.Hu Y.Hu G.S.Huang J.S.Huang S.H.Huang X.T.Huang X.Z.Huang Z.L.Huang T.Hussain W.Ikegami Andersson Q.Ji Q.P.Ji X.B.Ji X.L.Ji X.S.Jiang X.Y.Jiang J.B.Jiao Z.Jiao D.P.Jin S.Jin Y.Jin T.Johansson A.Julin N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke T.Khan A.Khoukaz P. Kiese R.Kliemt L.Koch O.B.Kolcu B.Kopf M.Kornicer M.Kuemmel M.Kuhlmann A.Kupsc W.K\"uhn J.S.Lange M.Lara P. Larin L.Lavezzi H.Leithoff C.Leng C.Li Cheng Li D.M.Li F.Li F.Y.Li G.Li H.B.Li H.J.Li J.C.LI Jin Li K.Li K.J.Li Lei Li P.L.Li P.R.Li Q.Y.Li T. Li W.D.Li W.G.Li X.L.Li X.N.Li X.Q.Li Z.B.Li H.Liang Y.F.Liang Y.T.Liang G.R.Liao D.X.Lin B.Liu B.J.Liu C.X.Liu D.Liu F.H.Liu Fang Liu Feng Liu H.B.Liu H.H.Liu H.M.Liu J.B.Liu J.Y.Liu K.Liu K.Y.Liu Ke Liu L.D.Liu P.L.Liu Q.Liu S.B.Liu X.Liu Y.B.Liu Z.A.Liu Zhiqing Liu Y. F.Long X.C.Lou H.J.Lu J.G.Lu Y.LU Y.P.Lu C.L.Luo M.X.Luo X.L.Luo X.R.Lyu F.C.Ma H.L.Ma L.L. Ma M.M.Ma Q.M.Ma T.Ma X.N.Ma X.Y.Ma Y.M.Ma F.E.Maas M.Maggiora Q.A.Malik Y.J.Mao Z.P.Mao S.Marcello Z.X.Meng J.G.Messchendorp G.Mezzadri J.Min T.J.Min R.E.Mitchell X.H.Mo Y.J.Mo C.Morales Morales G.Morello N.Yu.Muchnoi H.Muramatsu A.Mustafa Y.Nefedov F.Nerling I.B.Nikolaev Z.Ning S.Nisar S.L.Niu X.Y.Niu S.L.Olsen Q.Ouyang S.Pacetti Y.Pan M.Papenbrock P.Patteri M.Pelizaeus J.Pellegrino H.P.Peng K.Peters J.Pettersson J.L.Ping R.G.Ping A.Pitka R.Poling V.Prasad H.R.Qi M.Qi T.Y.Qi S.Qian C.F.Qiao N.Qin X.S.Qin Z.H.Qin J.F.Qiu K.H.Rashid C.F.Redmer M.Richter M.Ripka M.Rolo G.Rong Ch.Rosner A.Sarantsev M.Savri\'e C.Schnier K.Schoenning W.Shan M.Shao C.P.Shen P.X.Shen X.Y.Shen H.Y.Sheng J.J.Song W.M.Song X.Y.Song S.Sosio C.Sowa S.Spataro G.X.Sun J.F.Sun L.Sun S.S.Sun X.H.Sun Y.J.Sun Y.KSun Y.Z.Sun Z.J.Sun Z.T.Sun C.J.Tang G.Y.Tang X.Tang I.Tapan M.Tiemens B.T.Tsednee I.Uman G.S.Varner B.Wang B.L.Wang D.Wang D.Y.Wang Dan Wang K.Wang L.L.Wang L.S.Wang M.Wang P.Wang P.L.Wang W.P.Wang X.F. Wang Y.Wang Y.D.Wang Y.F.Wang Y.Q.Wang Z.Wang Z.G.Wang Z.H.Wang Z.Y.Wang Zongyuan Wang T.Weber D.H.Wei J.H.Wei P.Weidenkaff S.P.Wen U.Wiedner M.Wolke L.H.Wu L.J.Wu Z.Wu L.Xia Y.Xia D.Xiao H.Xiao Y.J.Xiao Z.J.Xiao X.H.Xie Y.G.Xie Y.H.Xie X.A.Xiong Q.L.Xiu G.F.Xu J.J.Xu L.Xu Q.J.Xu Q.N.Xu X.P.Xu L.Yan W.B.Yan W.C.Yan Y.H.Yan H.J.Yang H.X.Yang L.Yang Y.H.Yang Y.X.Yang M.Ye M.H.Ye J.H.Yin Z.Y.You B.X.Yu C.X.Yu J.S.Yu C.Z.Yuan Y.Yuan A.Yuncu A.A.Zafar Y.Zeng Z.Zeng B.X.Zhang B.Y.Zhang C.C.Zhang D.H.Zhang H.H.Zhang H.Y.Zhang J.Zhang J.L.Zhang J.Q.Zhang J.W.Zhang J.Y.Zhang J.Z.Zhang K.Zhang L.Zhang S.Q.Zhang X.Y.Zhang Y.Zhang Y.H.Zhang Y.T.Zhang Yu Zhang Z.H.Zhang Z.P.Zhang Z.Y.Zhang G.Zhao J.W.Zhao J.Y.Zhao J.Z.Zhao Lei Zhao Ling Zhao M.G.Zhao Q.Zhao S.J.Zhao T.C.Zhao Y.B.Zhao Z.G.Zhao A.Zhemchugov B.Zheng J.P.Zheng W.J.Zheng Y.H.Zheng B.Zhong L.Zhou X.Zhou X.K.Zhou X.R.Zhou X.Y.Zhou J.Zhu K.Zhu K.J.Zhu S.Zhu S.H.Zhu X.L.Zhu Y.C.Zhu Y.S.Zhu Z.A.Zhu J.Zhuang B.S.Zou J.H.Zou
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classification ✦ hep-ex
keywords rightarrowbranchingfractiondeterminedimprovesprevioustimes10bepcii
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Using a sample of $1.31 \times 10^{9}$ $J/\psi$ events collected with the BESIII detector at the BEPCII collider, we study the decays of $J/\psi \rightarrow K_S K_L$ and $K_S K_S$. The branching fraction of$J/\psi\rightarrow K_S K_L$ is determined to be ${\cal B}(J/\psi \rightarrow K_S K_L)=(1.93\pm0.01~(\rm{stat.})\pm0.05~(\rm{syst.}))\times10^{-4}$, which significantly improves on previous measurements. No clear signal is observed for the $J/\psi \rightarrow K_S K_S$ process, and the upper limit at the 95% confidence level for its branching fraction is determined to be ${\cal B}(J/\psi \rightarrow K_S K_S)<1.4\times10^{-8}$, which improves on the previous searches by two orders in magnitude and reaches the order of the Einstein-Podolsky-Rosen expectation.

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