/ hep-ex arXiv:1603.04936


Observation of $h_{c}$ radiative decay $h_{c} \rightarrow \gamma \eta'$ and evidence for $h_{c} \rightarrow \gamma \eta$


Ablikim, M. (Beijing, Inst. High Energy Phys.) ; Achasov, M.N. (Novosibirsk, IYF) ; Ai, X.C. (Beijing, Inst. High Energy Phys.) ; Albayrak, O. (Carnegie Mellon U.) ; Albrecht, M. (Ruhr U., Bochum) ; Ambrose, D.J. (Fermilab) ; Amoroso, A. (Ruhr U., Bochum, Inst. Expt. Phys.) ; An, F.F. (Beijing, Inst. High Energy Phys.) ; An, Q. (Hefei, CUST) ; Bai, J.Z. (Beijing, Inst. High Energy Phys.) ; Ferroli, R. Baldini (Frascati) ; Ban, Y. (Peking U.) ; Bennett, D.W. (Indiana U.) ; Bennett, J.V. (Carnegie Mellon U.) ; Bertani, M. (Frascati) ; Bettoni, D. (Ruhr U., Bochum) ; Bian, J.M. (Beijing, Inst. High Energy Phys.) ; Bianchi, F. (Turin U.) ; Boger, E. (Moscow, MIPT) ; Boyko, I. (Dubna, JINR) ; Briere, R.A. (Carnegie Mellon U.) ; Cai, H. (Wuhan U.) ; Cai, X. (Beijing, Inst. High Energy Phys.) ; Cakir, O. (Istanbul Aydin U.) ; Calcaterra, A. (Frascati) ; Cao, G.F. (Beijing, Inst. High Energy Phys.) ; Cetin, S.A. (Dogus U., Kadikoy) ; Chang, J.F. (Beijing, Inst. High Energy Phys.) ; Chelkov, G. (Tomsk State U.) ; Chen, G. (Chongqing U.) ; Chen, H.S. (SWCNU, Chongqing) ; Chen, H.Y. (Chicago U.) ; Chen, J.C. (Beijing, Inst. High Energy Phys.) ; Chen, M.L. (Beijing, Inst. High Energy Phys.) ; Chen, S. (Tsinghua U., Beijing) ; Chen, S.J. (Nanjing U.) ; Chen, X. (Lanzhou, Inst. Modern Phys.) ; Chen, X.R. (Lanzhou U.) ; Chen, Y.B. (ECIST, Fuzhou) ; Cheng, H.P. (Huangshan U.) ; Chu, X.K. (Peking U.) ; Cibinetto, G. (INFN, Ferrara) ; Dai, H.L. (Beijing, Inst. High Energy Phys.) ; Dai, J.P. (Shanghai, Jiao Tong U.) ; Dbeyssi, A. (Orsay, IPN) ; Dedovich, D. (Dubna, JINR) ; Deng, Z.Y. (Beijing, Inst. High Energy Phys.) ; Denig, A. (Mainz U., Inst. Kernphys.) ; Denysenko, I. (Dubna, JINR) ; Destefanis, M. (Turin U.) ; De Mori, F. (Turin U.) ; Ding, Y. (SLAC) ; Dong, C. (Nankai U.) ; Dong, J. (Beijing, Inst. High Energy Phys.) ; Dong, L.Y. (Beijing, Inst. High Energy Phys.) ; Dong, M.Y. (Beijing, Inst. High Energy Phys.) ; Dou, Z.L. (Nanjing U.) ; Du, S.X. (Zhengzhou U.) ; Duan, P.F. (Beijing, Inst. High Energy Phys.) ; Fan, J.Z. (Tsinghua U., Beijing) ; Fang, J. (Beijing, Inst. High Energy Phys.) ; Fang, S.S. (DESY) ; Fang, X. (Hefei, CUST) ; Fang, Y. (Beijing, Inst. High Energy Phys.) ; Farinelli, R. (INFN, Ferrara) ; Fava, L. (INFN, Turin) ; Fedorov, O. (Dubna, JINR) ; Feldbauer, F. (Ruhr U., Bochum) ; Felici, G. (Frascati) ; Feng, C.Q. (Hefei, CUST) ; Fioravanti, E. (INFN, Ferrara) ; Fritsch, M. (Mainz U., Inst. Phys.) ; Fu, C.D. (Beijing, Inst. High Energy Phys.) ; Gao, Q. (Beijing, Inst. High Energy Phys.) ; Gao, X.L. (Hefei, CUST) ; Gao, X.Y. (BeiHang U.) ; Gao, Y. (Texas A-M) ; Gao, Z. (Taiwan, Natl. Taiwan U.) ; Garzia, I. (INFN, Ferrara) ; Goetzen, K. (Darmstadt, GSI) ; Gong, L. (Nankai U.) ; Gong, W.X. (Beijing, Inst. High Energy Phys.) ; Gradl, W. (Mainz U., Inst. Kernphys.) ; Greco, M. (Rome III U.) ; Gu, M.H. (Beijing, Inst. High Energy Phys.) ; Gu, Y.T. (Guangxi U.) ; Guan, Y.H. (Beijing, GUCAS) ; Guo, A.Q. (Nankai U.) ; Guo, L.B. (Nanjing Normal U., Sch. Phys. Sci. Technol.) ; Guo, R.P. (Beijing, Inst. High Energy Phys.) ; Guo, Y. (Hefei, CUST) ; Guo, Y.P. (Nankai U.) ; Haddadi, Z. (Groningen, KVI) ; Hafner, A. (Mainz U., Inst. Kernphys.) ; Han, S. (Wuhan U.) ; Hao, X.Q. (Beijing, Inst. High Energy Phys.) ; Harris, F.A. (Hawaii U.) ; He, K.L. (Beijing, Inst. High Energy Phys.) ; Held, T. (Ruhr U., Bochum) ; Heng, Y.K. (Beijing, Inst. High Energy Phys.) ; Hou, Z.L. (Beijing, Inst. High Energy Phys.) ; Hu, C. (Nanjing Normal U.) ; Hu, H.M. (Beijing, Inst. High Energy Phys.) ; Hu, J.F. (Beijing, GUCAS) ; Hu, T. (Beijing, Inst. High Energy Phys.) ; Hu, Y. (Beijing, Inst. High Energy Phys.) ; Huang, G.S. (Oklahoma U.) ; Huang, J.S. (Henan Normal U.) ; Huang, X.T. (Puerto Rico U., Mayaguez) ; Huang, X.Z. (Nanjing U., Dept. Astron.) ; Huang, Y. (DESY) ; Huang, Z.L. ; Hussain, T. (Punjab U.) ; Ji, Q. (Beijing, Inst. High Energy Phys.) ; Ji, Q.P. 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(Shanxi U.) ; Liu, Fang (Beijing, Inst. High Energy Phys.) ; Liu, Feng (Hua-Zhong Normal U.) ; Liu, H.B. (Beijing, GUCAS) ; Liu, H.H. (Henan U.) ; Liu, H.M. (New Mexico State U.) ; Liu, J. (William-Mary Coll.) ; Liu, J.B. (Beijing, Inst. High Energy Phys.) ; Liu, J.P. (Beijing, Inst. High Energy Phys.) ; Liu, J.Y. (Beijing, Inst. High Energy Phys.) ; Liu, K. (Marseille, CPPM) ; Liu, K.Y. (Liaoning U.) ; Liu, L.D. (Peking U.) ; Liu, P.L. (Beijing, Inst. High Energy Phys.) ; Liu, Q. (Los Alamos) ; Liu, S.B. (Hefei, CUST) ; Liu, X. (Lanzhou U.) ; Liu, Y.B. (Nankai U.) ; Liu, Z.A. (Beijing, Inst. High Energy Phys.) ; Liu, Zhiqing (Mainz U., Inst. Phys.) ; Loehner, H. (Groningen, KVI) ; Lou, X.C. (Texas U., Dallas) ; Lu, H.J. (Jiaozuo U.) ; Lu, J.G. (Beijing, Inst. High Energy Phys.) ; Lu, Y. (Hefei, CUST) ; Lu, Y.P. (Beijing, Inst. High Energy Phys.) ; Luo, C.L. (Nanjing Normal U.) ; Luo, M.X. (Zhejiang U.) ; Luo, T. (Hawaii U.) ; Luo, X.L. (Hefei, CUST) ; Lyu, X.R. (Beijing, GUCAS) ; Ma, F.C. (Liaoning U.) ; Ma, H.L. (Brookhaven) ; Ma, L.L. (Shandong U.) ; Ma, M.M. (Beijing, Inst. High Energy Phys.) ; Ma, Q.M. (Beijing, Inst. High Energy Phys.) ; Ma, T. (Beijing, Inst. High Energy Phys.) ; Ma, X.N. (Nankai U.) ; Ma, X.Y. (Beijing, Inst. High Energy Phys.) ; Ma, Y.M. (Shandong U.) ; Maas, F.E. (Darmstadt, GSI) ; Maggiora, M. (Turin U.) ; Mao, Y.J. (Peking U.) ; Mao, Z.P. (Beijing, Inst. High Energy Phys.) ; Marcello, S. (Turin U.) ; Messchendorp, J.G. (Groningen, KVI) ; Min, J. (Beijing, Inst. High Energy Phys.) ; Mitchell, R.E. (Indiana U.) ; Mo, X.H. (Beijing, Inst. High Energy Phys.) ; Mo, Y.J. (Hua-Zhong Normal U.) ; Morales, C. Morales (Mainz U., Inst. Phys.) ; Muchnoi, N. Yu. (Novosibirsk, IYF) ; Muramatsu, H. (Minnesota U.) ; Nefedov, Y. (Dubna, JINR) ; Nerling, F. (Freiburg U.) ; Nikolaev, I.B. (Novosibirsk, IYF) ; Ning, Z. (Beijing, Inst. High Energy Phys.) ; Nisar, S. (COMSATS, Islamabad) ; Niu, S.L. (Beijing, Inst. 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(Dubna, JINR) ; Zheng, B. (U. South China, Hengyang) ; Zheng, J.P. (Beijing, Inst. High Energy Phys.) ; Zheng, W.J. (Shandong U.) ; Zheng, Y.H. ; Zhong, B. (Nanjing Normal U.) ; Zhou, L. (Hefei, CUST) ; Zhou, X. (Wuhan U.) ; Zhou, X.K. (Beijing, GUCAS) ; Zhou, X.R. (Hefei, CUST) ; Zhou, X.Y. (Beijing, Inst. High Energy Phys.) ; Zhu, K. (Beijing, Inst. High Energy Phys.) ; Zhu, K.J. (Caltech) ; Zhu, S. (Maryland U.) ; Zhu, S.H. (Peking U.) ; Zhu, X.L. (Tsinghua U., Beijing) ; Zhu, Y.C. (Hefei, CUST) ; Zhu, Y.S. (Beijing, Inst. High Energy Phys.) ; Zhu, Z.A. (Beijing, Inst. High Energy Phys.) ; Zhuang, J. (Beijing, Inst. High Energy Phys.) ; Zotti, L. (Turin U.) ; Zou, B.S. (Beijing, Inst. High Energy Phys.) ; Zou, J.H. (Beijing, Inst. High Energy Phys.)

Pages: 7

Abstract: A search for radiative decays of the $P$-wave spin singlet charmonium resonance $h_c$ is performed based on $4.48 \times 10^{8}$ $\psi'$ events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels $h_{c} \rightarrow \gamma \eta'$ and $\gamma \eta$ are observed with a statistical significance of $8.4 \sigma$ and $4.0 \sigma$, respectively, for the first time. The branching fractions of $h_{c} \rightarrow \gamma \eta'$ and $h_{c} \rightarrow \gamma \eta$ are measured to be $\mathcal{B}(h_{c} \rightarrow \gamma \eta')=(1.52 \pm 0.27 \pm 0.29)\times10^{-3}$ and $\mathcal{B}(h_{c} \rightarrow \gamma \eta)=(4.7 \pm 1.5 \pm 1.4)\times10^{-4}$, respectively, where the first errors are statistical and the second are systematic uncertainties.

Web-Page: http://inspirehep.net/record/1428663/files/scatter_etahc_4.png; http://inspirehep.net/record/1428663/files/scatter_etahc_3.png; http://inspirehep.net/record/1428663/files/scatter_etaphc_2.png; http://inspirehep.net/record/1428663/files/simultaneousfit_4.png; http://inspirehep.net/record/1428663/files/simultaneousfit_3.png; http://inspirehep.net/record/1428663/files/simultaneousfit_1.png; http://inspirehep.net/record/1428663/files/simultaneousfit_2.png; http://inspirehep.net/record/1428663/files/scatter_etaphc_1.png; http://inspirehep.net/record/1428663/files/arXiv:1603.04936.pdf


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