/ Experiment-HEP arXiv:1002.0501


Measurements of h_c(^1P_1) in psi' Decays


Ablikim, M. (Beijing, Inst. High Energy Phys.) ; Achasov, M.N. (Novosibirsk, IYF) ; An, L. (Guangxi U.) ; An, Q. (Hefei, CUST) ; An, Z.H. (Beijing, Inst. High Energy Phys.) ; Bai, J.Z. (Beijing, Inst. High Energy Phys.) ; Ban, Y. (Peking U.) ; Berger, N. (Beijing, Inst. High Energy Phys.) ; Bian, J.M. (Beijing, Inst. High Energy Phys.) ; Boyko, I. (Dubna, JINR) ; Briere, Roy A. (Carnegie Mellon U.) ; Bytev, V. (Dubna, JINR) ; Cai, X. (Beijing, Inst. High Energy Phys.) ; Cao, G.F. (Beijing, Inst. High Energy Phys.) ; Cao, X.X. (Beijing, Inst. High Energy Phys.) ; Chang, J.F. (Beijing, Inst. High Energy Phys.) ; Chelkov, G. (Dubna, JINR) ; Chen, G. (Beijing, Inst. High Energy Phys.) ; Chen, H.S. (Beijing, Inst. High Energy Phys.) ; Chen, J.C. (Beijing, Inst. High Energy Phys.) ; Chen, L.P. (Beijing, Inst. High Energy Phys.) ; Chen, M.L. (Beijing, Inst. High Energy Phys.) ; Chen, P. (Beijing, Inst. High Energy Phys.) ; Chen, S.J. (Nanjing U.) ; Chen, Y.B. (Beijing, Inst. High Energy Phys.) ; Chu, Y.P. (Beijing, Inst. High Energy Phys.) ; Cronin-Hennessy, D. (Minnesota U.) ; Dai, H.L. (Beijing, Inst. High Energy Phys.) ; Dai, J.P. (Beijing, Inst. High Energy Phys.) ; Dedovich, D. (Dubna, JINR) ; Deng, Z.Y. (Beijing, Inst. High Energy Phys.) ; Denysenko, I. (Dubna, JINR) ; Destefanis, M. (INFN, Turin) ; Ding, Y. (Liaoning U.) ; Dong, L.Y. (Beijing, Inst. High Energy Phys.) ; Dong, M.Y. (Beijing, Inst. High Energy Phys.) ; Du, S.X. (Zhengzhou U.) ; Duan, M.Y. (Shanxi U.) ; Fang, J. (Beijing, Inst. High Energy Phys.) ; Feng, C.Q. (Hefei, CUST) ; Fu, C.D. (Beijing, Inst. High Energy Phys.) ; Fu, J.L. (Nanjing U.) ; Gao, Y. (Tsinghua U., Beijing) ; Geng, C. (Hefei, CUST) ; Goetzen, K. (Darmstadt, GSI) ; Gong, W.X. (Beijing, Inst. High Energy Phys.) ; Greco, M. (INFN, Turin) ; Grishin, S. (Dubna, JINR) ; Gu, Y.T. (Guangxi U.) ; Guo, A.Q. (Nankai U.) ; Guo, L.B. (Nanjing Normal U.) ; Guo, Y.P. (Nankai U.) ; Han, S.Q. (Nanjing Normal U.) ; Harris, F.A. (Hawaii U.) ; He, K.L. (Beijing, Inst. High Energy Phys.) ; He, M. (Beijing, Inst. High Energy Phys.) ; He, Z.Y. (Nankai U.) ; Heng, Y.K. (Beijing, Inst. High Energy Phys.) ; Hou, Z.L. (Beijing, Inst. High Energy Phys.) ; Hu, H.M. (Beijing, Inst. High Energy Phys.) ; Hu, J.F. (Beijing, GUCAS) ; Hu, T. (Beijing, Inst. High Energy Phys.) ; Hu, X.W. (Nanjing U.) ; Huang, B. (Beijing, Inst. High Energy Phys.) ; Huang, G.M. (Hua-Zhong Normal U.) ; Huang, J.S. (Henan Normal U.) ; Huang, X.T. (Shandong U.) ; Huang, Y.P. (Beijing, Inst. High Energy Phys.) ; Ji, C.S. (Hefei, CUST) ; Ji, Q. (Beijing, Inst. High Energy Phys.) ; Ji, X.B. (Beijing, Inst. High Energy Phys.) ; Ji, X.L. (Beijing, Inst. High Energy Phys.) ; Jia, L.K. (Beijing, Inst. High Energy Phys.) ; Jiang, L.L. (Beijing, Inst. High Energy Phys.) ; Jiang, X.S. (Beijing, Inst. High Energy Phys.) ; Jiao, J.B. (Shandong U.) ; Jin, D.P. (Beijing, Inst. High Energy Phys.) ; Jin, S. (Beijing, Inst. High Energy Phys.) ; Komamiya, S. (Tokyo U.) ; Kuehn, W. (Giessen U.) ; Lange, S. (Giessen U.) ; Leung, J.K.C. (Hong Kong U.) ; Li, Cheng (Hefei, CUST) ; Li, Cui (Hefei, CUST) ; Li, D.M. (Zhengzhou U.) ; Li, F. (Beijing, Inst. High Energy Phys.) ; Li, G. (Beijing, Inst. High Energy Phys.) ; Li, H.B. (Beijing, Inst. High Energy Phys.) ; Li, J. (Beijing, Inst. High Energy Phys.) ; Li, J.C. (Beijing, Inst. High Energy Phys.) ; Li, Lei (Beijing, Inst. High Energy Phys.) ; Li, Lu (Beijing, Inst. High Energy Phys.) ; Li, Q.J. (Beijing, Inst. High Energy Phys.) ; Li, W.D. (Beijing, Inst. High Energy Phys.) ; Li, W.G. (Beijing, Inst. High Energy Phys.) ; Li, X.L. (Shandong U.) ; Li, X.N. (Beijing, Inst. High Energy Phys.) ; Li, X.Q. (Nankai U.) ; Li, X.R. (Beijing, Inst. High Energy Phys.) ; Li, Y.X. (Zhengzhou U.) ; Li, Z.B. (Zhongshan U.) ; Liang, H. (Hefei, CUST) ; Liang, T.R. (Nankai U.) ; Liang, Y.T. (Giessen U.) ; Liang, Y.F. (Sichuan U.) ; Liao, G.R (Guangxi Normal U.) ; Liao, X.T. (Beijing, Inst. High Energy Phys.) ; Liu, B.J. (Hong Kong U.) ; Liu, C.L. (Carnegie Mellon U.) ; Liu, C.X. (Beijing, Inst. High Energy Phys.) ; Liu, C.Y. (Beijing, Inst. High Energy Phys.) ; Liu, F.H. (Shanxi U.) ; Liu, Fang (Beijing, Inst. High Energy Phys.) ; Liu, Feng (Hua-Zhong Normal U.) ; Liu, G.C. (Beijing, Inst. High Energy Phys.) ; Liu, H. (Beijing, Inst. High Energy Phys.) ; Liu, H.B. (Beijing, GUCAS) ; Liu, H.M. (Beijing, Inst. High Energy Phys.) ; Liu, H.W. (Beijing, Inst. High Energy Phys.) ; Liu, J. (Beijing, Inst. High Energy Phys.) ; Liu, J.P. (Wuhan U.) ; Liu, K. (Peking U.) ; Liu, K.Y. (Liaoning U.) ; Liu, Q. (Hawaii U.) ; Liu, S.B. (Hefei, CUST) ; Liu, X.H. (Beijing, Inst. High Energy Phys.) ; Liu, Y.B. (Nankai U.) ; Liu, Y.F. (Nankai U.) ; Liu, Y.W. (Hefei, CUST) ; Liu, Yong (Beijing, Inst. High Energy Phys.) ; Liu, Z.A. (Beijing, Inst. High Energy Phys.) ; Lu, G.R. (Henan Normal U.) ; Lu, J.G. (Beijing, Inst. High Energy Phys.) ; Lu, Q.W. (Shanxi U.) ; Lu, X.R. (Beijing, GUCAS) ; Lu, Y.P. (Beijing, Inst. High Energy Phys.) ; Luo, C.L. (Nanjing Normal U.) ; Luo, M.X. (Zhejiang U.) ; Luo, T. (Beijing, Inst. High Energy Phys.) ; Luo, X.L. (Beijing, Inst. High Energy Phys.) ; Ma, C.L. (Beijing, GUCAS) ; Ma, F.C. (Liaoning U.) ; Ma, H.L. (Beijing, Inst. High Energy Phys.) ; Ma, Q.M. (Beijing, Inst. High Energy Phys.) ; Ma, X. (Beijing, Inst. High Energy Phys.) ; Ma, X.Y. (Beijing, Inst. High Energy Phys.) ; Maggiora, M. (INFN, Turin) ; Mao, Y.J. (Peking U.) ; Mao, Z.P. (Beijing, Inst. High Energy Phys.) ; Min, J. (Beijing, Inst. High Energy Phys.) ; Mo, X.H. (Beijing, Inst. High Energy Phys.) ; Muchnoi, N.Yu. (Novosibirsk, IYF) ; Nefedov, Y. (Dubna, JINR) ; Ning, F.P. (Shanxi U.) ; Olsen, S.L. (Seoul Natl U.) ; Ouyang, Q. (Beijing, Inst. High Energy Phys.) ; Pelizaeus, M. (Ruhr U., Bochum) ; Peters, K. (Darmstadt, GSI) ; Ping, J.L. (Nanjing Normal U.) ; Ping, R.G. (Beijing, Inst. High Energy Phys.) ; Poling, R. (Minnesota U.) ; Pun, C.S.J. (Hong Kong U.) ; Qi, M. (Nanjing U.) ; Qian, S. (Beijing, Inst. High Energy Phys.) ; Qiao, C.F. (Beijing, GUCAS) ; Qiu, J.F. (Beijing, Inst. High Energy Phys.) ; Rong, G. (Beijing, Inst. High Energy Phys.) ; Ruan, X.D. (Guangxi U.) ; Sarantsev, A. (Dubna, JINR) ; Shao, M. (Hefei, CUST) ; Shen, C.P. (Hawaii U.) ; Shen, X.Y. (Beijing, Inst. High Energy Phys.) ; Sheng, H.Y. (Beijing, Inst. High Energy Phys.) ; Sonoda, S. (Tokyo U.) ; Spataro, S. (INFN, Turin) ; Spruck, B. (Giessen U.) ; Sun, D.H. (Beijing, Inst. High Energy Phys.) ; Sun, G.X. (Beijing, Inst. High Energy Phys.) ; Sun, J.F. (Henan Normal U.) ; Sun, S.S. (Beijing, Inst. High Energy Phys.) ; Sun, X.D. (Beijing, Inst. High Energy Phys.) ; Sun, Y.J. (Hefei, CUST) ; Sun, Y.Z. (Beijing, Inst. High Energy Phys.) ; Sun, Z.J. (Beijing, Inst. High Energy Phys.) ; Sun, Z.T. (Hefei, CUST) ; Tang, C.J. (Sichuan U.) ; Tang, X. (Beijing, Inst. High Energy Phys.) ; Tang, X.F. (Guangxi Normal U.) ; Tian, H.L. (Beijing, Inst. High Energy Phys.) ; Toth, D. (Minnesota U.) ; Varner, G.S. (Hawaii U.) ; Wan, X. (Beijing, Inst. High Energy Phys.) ; Wang, B.Q. (Peking U.) ; Wang, J.K. (Beijing, Inst. High Energy Phys.) ; Wang, K. (Beijing, Inst. High Energy Phys.) ; Wang, L.L. (CCAST World Lab, Beijing) ; Wang, L.S. (Beijing, Inst. High Energy Phys.) ; Wang, P. (Beijing, Inst. High Energy Phys.) ; Wang, P.L. (Beijing, Inst. High Energy Phys.) ; Wang, Q. (Beijing, Inst. High Energy Phys.) ; Wang, S.G. (Peking U.) ; Wang, X.D. (Shanxi U.) ; Wang, X.L. (Hefei, CUST) ; Wang, Y.D. (Hefei, CUST) ; Wang, Y.F. (Beijing, Inst. High Energy Phys.) ; Wang, Y.Q. (Shandong U.) ; Wang, Z. (Beijing, Inst. High Energy Phys.) ; Wang, Z.G. (Beijing, Inst. High Energy Phys.) ; Wang, Z.Y. (Beijing, Inst. High Energy Phys.) ; Wei, D.H. (Guangxi Normal U.) ; Wen, S.P. (Beijing, Inst. High Energy Phys.) ; Wiedner, U. (Ruhr U., Bochum) ; Wu, L.H. (Beijing, Inst. High Energy Phys.) ; Wu, N. (Beijing, Inst. High Energy Phys.) ; Wu, W. (Liaoning U.) ; Wu, Y.M. (Beijing, Inst. High Energy Phys.) ; Wu, Z. (Beijing, Inst. High Energy Phys.) ; Xiao, Z.J. (Nanjing Normal U.) ; Xie, Y.G. (Beijing, Inst. High Energy Phys.) ; Xu, G.F. (Beijing, Inst. High Energy Phys.) ; Xu, G.M. (Peking U.) ; Xu, H. (Beijing, Inst. High Energy Phys.) ; Xu, Min (Hefei, CUST) ; Xu, Ming (Guangxi U.) ; Xu, X.P. (Hua-Zhong Normal U.) ; Xu, Y. (Nankai U.) ; Xu, Z.Z. (Hefei, CUST) ; Xue, Z. (Hefei, CUST) ; Yan, L. (Hefei, CUST) ; Yan, W.B. (Hefei, CUST) ; Yan, Y.H. (Hunan U.) ; Yang, H.X. (Beijing, Inst. High Energy Phys.) ; Yang, M. (Beijing, Inst. High Energy Phys.) ; Yang, P. (Nankai U.) ; Yang, S.M. (Beijing, Inst. High Energy Phys.) ; Yang, Y.X. (Guangxi Normal U.) ; Ye, M. (Beijing, Inst. High Energy Phys.) ; Ye, M.H. (CCAST World Lab, Beijing) ; Yu, B.X. (Beijing, Inst. High Energy Phys.) ; Yu, C.X. (Nankai U.) ; Yu, L. (Hua-Zhong Normal U.) ; Yuan, C.Z. (Beijing, Inst. High Energy Phys.) ; Yuan, Y. (Beijing, Inst. High Energy Phys.) ; Zeng, Y. (Hunan U.) ; Zhang, B.X. (Beijing, Inst. High Energy Phys.) ; Zhang, B.Y. (Beijing, Inst. High Energy Phys.) ; Zhang, C.C. (Beijing, Inst. High Energy Phys.) ; Zhang, D.H. (Beijing, Inst. High Energy Phys.) ; Zhang, H.H. (Zhongshan U.) ; Zhang, H.Y. (Beijing, Inst. High Energy Phys.) ; Zhang, J.W. (Beijing, Inst. High Energy Phys.) ; Zhang, J.Y. (Beijing, Inst. High Energy Phys.) ; Zhang, J.Z. (Beijing, Inst. High Energy Phys.) ; Zhang, L. (Nanjing U.) ; Zhang, S.H. (Beijing, Inst. High Energy Phys.) ; Zhang, X.Y. (Shandong U.) ; Zhang, Y. (Beijing, Inst. High Energy Phys.) ; Zhang, Y.H. (Beijing, Inst. High Energy Phys.) ; Zhang, Z.P. (Hefei, CUST) ; Zhao, C. (Hefei, CUST) ; Zhao, H.S. (Beijing, Inst. High Energy Phys.) ; Zhao, Jiawei (Hefei, CUST) ; Zhao, Jingwei (Beijing, Inst. High Energy Phys.) ; Zhao, Lei (Hefei, CUST) ; Zhao, Ling (Beijing, Inst. High Energy Phys.) ; Zhao, M.G. (Nankai U.) ; Zhao, Q. (Beijing, Inst. High Energy Phys.) ; Zhao, S.J. (Zhengzhou U.) ; Zhao, T.C. (Washington U., Seattle) ; Zhao, X.H. (Nanjing U.) ; Zhao, Y.B. (Beijing, Inst. High Energy Phys.) ; Zhao, Z.G. (Hefei, CUST) ; Zhemchugov, A. (Dubna, JINR) ; Zheng, B. (Beijing, Inst. High Energy Phys.) ; Zheng, J.P. (Beijing, Inst. High Energy Phys.) ; Zheng, Y.H. (Beijing, GUCAS) ; Zheng, Z.P. (Beijing, Inst. High Energy Phys.) ; Zhong, B. (Nanjing Normal U.) ; Zhong, J. (Ruhr U., Bochum) ; Zhou, L. (Beijing, Inst. High Energy Phys.) ; Zhou, Z.L. (Beijing, Inst. High Energy Phys.) ; Zhu, C. (Beijing, Inst. High Energy Phys.) ; Zhu, K. (Beijing, Inst. High Energy Phys.) ; Zhu, K.J. (Beijing, Inst. High Energy Phys.) ; Zhu, Q.M. (Beijing, Inst. High Energy Phys.) ; Zhu, X.W. (Beijing, Inst. High Energy Phys.) ; Zhu, Y.S. (Beijing, Inst. High Energy Phys.) ; Zhu, Z.A. (Beijing, Inst. High Energy Phys.) ; Zhuang, J. (Beijing, Inst. High Energy Phys.) ; Zou, B.S. (Beijing, Inst. High Energy Phys.) ; Zou, J.H. (Beijing, Inst. High Energy Phys.) ; Zuo, J.X. (Beijing, Inst. High Energy Phys.) ; Zweber, P. (Minnesota U.)

Published in: Phys.Rev.Lett.
Year: 2010
Vol.: 104
Page No: 132002
Pages: 6

Abstract: We present measurements of the charmonium state $h_c(^1P_1)$ made with 106M $\psi'$ events collected by BESIII at BEPCII. Clear signals are observed for $\psi'\to\pi^0 h_c$ with and without the subsequent radiative decay $h_c\to\gamma\eta_c$. First measurements of the absolute branching ratios $\mathcal{B}(\psi' \to\pi^0 h_c) = (8.4 \pm 1.3 \pm 1.0) \times 10^{-4}$ and $\mathcal{B}(h_c \to \gamma \eta_c) = (54.3 \pm 6.7 \pm5.2)%$ are presented. A statistics-limited determination of the previously unmeasured $h_c$ width leads to an upper limit $\Gamma(h_c)<1.44 $MeV (90% confidence). Measurements of $M(h_c) = 3525.40 \pm 0.13 \pm 0.18 $MeV/$c^2$ and $\mathcal{B}(\psi'\to \pi^0 h_c) \times \mathcal{B}(h_c \to \gamma\eta_c) = (4.58 \pm 0.40 \pm 0.50) \times 10^{-4}$ are consistent with previous results.

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