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Observation of e⁺e⁻ to η h_(c) at center-of-mass energies from 4.085 to 4.600 GeV

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arxiv 1704.08033 v3 pith:3QIVRL3G submitted 2017-04-26 hep-ex

Observation of e⁺e⁻ to η h_(c) at center-of-mass energies from 4.085 to 4.600 GeV

BESIII collaboration: M.Ablikim , M.N.Achasov , S. Ahmed , X.C.Ai , O.Albayrak , M.Albrecht , D.J.Ambrose , A.Amoroso
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F.F.An Q.An J.Z.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.Chen S.J.Chen X.Chen X.R.Chen Y.B.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 Z.L.Dou S.X.Du P.F.Duan J.Z.Fan J.Fang S.S.Fang X.Fang Y.Fang R.Farinelli L.Fava F.Feldbauer G.Felici C.Q.Feng E.Fioravanti M. Fritsch C.D.Fu Q.Gao X.L.Gao Y.Gao Z.Gao I.Garzia K.Goetzen L.Gong W.X.Gong W.Gradl M.Greco M.H.Gu Y.T.Gu Y.H.Guan A.Q.Guo L.B.Guo R.P.Guo Y.Guo Y.P.Guo Z.Haddadi A.Hafner S.Han X.Q.Hao F.A.Harris K.L.He F.H.Heinsius T.Held Y.K.Heng T.Holtmann Z.L.Hou C.Hu H.M.Hu T.Hu Y.Hu G.S.Huang J.S.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 L.W.Jiang X.S.Jiang X.Y.Jiang J.B.Jiao Z.Jiao D.P.Jin S.Jin T.Johansson A.Julin N.Kalantar-Nayestanaki X.L.Kang X.S.Kang M.Kavatsyuk B.C.Ke P. Kiese R.Kliemt B.Kloss O.B.Kolcu B.Kopf M.Kornicer A.Kupsc W.K\"uhn J.S.Lange M.Lara P. Larin 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 Lei Li P.R.Li Q.Y.Li T. Li W.D.Li W.G.Li X.L.Li X.N.Li X.Q.Li Y.B.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.Liu J.B.Liu J.P.Liu J.Y.Liu K.Liu K.Y.Liu L.D.Liu P.L.Liu Q.Liu S.B.Liu X.Liu Y.B.Liu Y.Y.Liu Z.A.Liu Zhiqing Liu H.Loehner Y. F.Long X.C.Lou H.J.Lu J.G.Lu Y.LU Y.P.Lu C.L.Luo M.X.Luo T.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 J.G.Messchendorp G.Mezzadri J.Min T.J.Min R.E.Mitchell X.H.Mo Y.J.Mo C.Morales Morales N.Yu.Muchnoi H.Muramatsu P.Musiol 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 H.P.Peng K.Peters J.Pettersson J.L.Ping R.G.Ping R.Poling V.Prasad H.R.Qi M.Qi S.Qian C.F.Qiao L.Q.Qin N.Qin X.S.Qin Z.H.Qin J.F.Qiu K.H.Rashid C.F.Redmer M.Ripka G.Rong Ch.Rosner X.D.Ruan 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 W.M.Song X.Y.Song S.Sosio S.Spataro G.X.Sun J.F.Sun S.S.Sun X.H.Sun Y.J.Sun Y.Z.Sun Z.J.Sun Z.T.Sun C.J.Tang X.Tang I.Tapan E.H.Thorndike M.Tiemens I.Uman G.S.Varner B.Wang B.L.Wang D.Wang D.Y.Wang K.Wang L.L.Wang L.S.Wang M.Wang P.Wang P.L.Wang W.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 T.Weber D.H.Wei P.Weidenkaff S.P.Wen U.Wiedner M.Wolke L.H.Wu L.J.Wu Z.Wu L.Xia L.G.Xia Y.Xia D.Xiao H.Xiao Z.J.Xiao Y.G.Xie Y.H.Xie 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.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.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.N.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 Q.W.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 K.Zhu K.J.Zhu S.Zhu S.H.Zhu X.L.Zhu Y.C.Zhu Y.S.Zhu Z.A.Zhu J.Zhuang L.Zotti B.S.Zou J.H.Zou
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classification hep-ex
keywords center-of-masscrosssectionbornenergiesobservedsqrtbesiii
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We observe for the first time the process $e^{+}e^{-} \rightarrow \eta h_c$ with data collected by the BESIII experiment. Significant signals are observed at the center-of-mass energy $\sqrt{s}=4.226$ GeV, and the Born cross section is measured to be $(9.5^{+2.2}_{-2.0} \pm 2.7)$ pb. Evidence for $\eta h_c$ is observed at $\sqrt{s}=4.358$ GeV with a Born cross section of $(10.0^{+3.1}_{-2.7} \pm 2.6)$ pb, and upper limits on the production cross section at other center-of-mass energies between 4.085 and 4.600 GeV are determined.

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