Study of $J/{\psi}{\rightarrow}p\bar{p}$ and $J/{\psi}{\rightarrow}n\bar{n}$
- Ablikim, M.
- Achasov, M.N.
- Ambrose, D.J.
- An, F.F.
- An, Q.
- An, Z.H.
- Bai, J.Z.
- Ban, Y.
- Becker, J.
- Berger, N.
- Bertani, M.
- Bian, J.M.
- Boger, E.
- Bondarenko, O.
- Boyko, I.
- Briere, R.A.
- Bytev, V.
- Cai, X.
- Calcaterra, A.
- Cao, G.F.
- Chang, J.F.
- Chelkov, G.
- Chen, G.
- Chen, H.S.
- Chen, J.C.
- Chen, M.L.
- Chen, S.J.
- Chen, Y.
- Chen, Y.B.
- Cheng, H.P.
- Chu, Y.P.
- Cronin-Hennessy, D.
- Dai, H.L.
- Dai, J.P.
- Dedovich, D.
- Deng, Z.Y.
- Denig, A.
- Denysenko, I.
- Destefanis, M.
- Ding, W.M.
- Ding, Y.
- Dong, L.Y.
- Dong, M.Y.
- Du, S.X.
- Fang, J.
- Fang, S.S.
- Fava, L.
- Feldbauer, F.
- Feng, C.Q.
- Ferroli, R.B.
- Fu, C.D.
- Fu, J.L.
- Gao, Y.
- Geng, C.
- Goetzen, K.
- Gong, W.X.
- Gradl, W.
- Greco, M.
- Gu, M.H.
- Gu, Y.T.
- Guan, Y.H.
- Guo, A.Q.
- Guo, L.B.
- Guo, Y.P.
- Han, Y.L.
- Hao, X.Q.
- Harris, F.A.
- He, K.L.
- He, M.
- He, Z.Y.
- Held, T.
- Heng, Y.K.
- Hou, Z.L.
- Hu, H.M.
- Hu, J.F.
- Hu, T.
- Huang, B.
- Huang, G.M.
- Huang, J.S.
- Huang, X.T
- Huang, Y.P.
- Hussain, T.
- Ji, C.S.
- Ji, Q.
- Ji, X.B.
- Ji, X.L.
- Jia, L.K.
- Jiang, L.L.
- Jiang, X.S.
- Jiao, J.B.
- Jiao, Z.
- Jin, D.P.
- Jin, S.
- Jing, F.F.
- Kalantar-Nayestanaki, N.
- Kavatsyuk, M.
- Kuehn, W.
- Lai, W.
- Lange, J.S.
- Leung, J.K.C.
- Li, C.H.
- Li, C.
- Li, C.
- Li, D.M.
- Li, F.
- Li, G.
- Li, H.B.
- Li, J.C.
- Li, K.
- Li, L.
- Li, N.B.
- Li, Q.J.
- Li, S.L.
- Li, W.D.
- Li, W.G.
- Li, X.L.
- Li, X.N.
- Li, X.Q.
- Li, X.R.
- Li, Z.B.
- Liang, H.
- Liang, Y.F.
- Liang, Y.T.
- Liao, G.R.
- Liao, X.T.
- Liu, B.J.
- Liu, B.J.
- Liu, C.L.
- Liu, C.X.
- Liu, C.Y.
- Liu, F.H.
- Liu, F.
- Liu, F.
- Liu, H.
- Liu, H.B.
- Liu, H.H.
- Liu, H.M.
- Liu, H.W.
- Liu, J.P.
- Liu, K.Y.
- Liu, K.
- Liu, K.
- Liu, P.L.
- Liu, S.B.
- Liu, X.
- Liu, X.H.
- Liu, Y.
- Liu, Y.B.
- Liu, Z.A.
- Liu, Z.
- Liu, Z.
- Loehner, H.
- Lu, G.R.
- Lu, H.J.
- Lu, J.G.
- Lu, Q.W.
- Lu, X.R.
- Lu, Y.P.
- Luo, C.L.
- Luo, M.X.
- Luo, T.
- Luo, X.L.
- Lv, M.
- Ma, C.L.
- Ma, F.C.
- Ma, H.L.
- Ma, Q.M.
- Ma, S.
- Ma, T.
- Ma, X.Y.
- Ma, Y.
- Maas, F.E.
- Maggiora, M.
- Malik, Q.A.
- Mao, H.
- Mao, Y.J.
- Mao, Z.P.
- Messchendorp, J.G.
- Min, J.
- Min, T.J.
- Mitchell, R.E.
- Mo, X.H.
- Morales, C.
- Motzko, C.
- Muchnoi, N. Yu.
- Nefedov, Y.
- Nicholson, C.
- Nikolaev, I.B.
- Ning, Z.
- Olsen, S.L.
- Ouyang, Q.
- Pacetti, S.
- Park, J.W.
- Pelizaeus, M.
- Peters, K.
- Ping, J.L.
- Ping, R.G.
- Poling, R.
- Prencipe, E.
- Pun, C.S.J.
- Qi, M.
- Qian, S.
- Qiao, C.F.
- Qin, X.S.
- Qin, Y.
- Qin, Z.H.
- Qiu, J.F.
- Rashid, K.H.
- Rong, G.
- Ruan, X.D.
- Sarantsev, A.
- Schulze, J.
- Shao, M.
- Shen, C.P.
- Shen, X.Y.
- Sheng, H.Y.
- Shepherd, M.R.
- Song, X.Y.
- Spataro, S.
- Spruck, B.
- Sun, D.H.
- Sun, G.X.
- Sun, J.F.
- Sun, S.S.
- Sun, X.D.
- Sun, Y.J.
- Sun, Y.Z.
- Sun, Z.J.
- Sun, Z.T.
- Tang, C.J.
- Tang, X.
- Thorndike, E.H.
- Tian, H.L.
- Toth, D.
- Ullrich, M.
- Varner, G.S.
- Wang, B.
- Wang, B.Q.
- Wang, K.
- Wang, L.L.
- Wang, L.S.
- Wang, M.
- Wang, P.
- Wang, P.L.
- Wang, Q.
- Wang, Q.J.
- Wang, S.G.
- Wang, X.F.
- Wang, X.L.
- Wang, Y.D.
- Wang, Y.F.
- Wang, Y.Q.
- Wang, Z.
- Wang, Z.G
- Wang, Z.Y.
- Wei, D.H.
- Weidenkaff, P.
- Wen, Q.G.
- Wen, S.P.
- Werner, M.
- Wiedner, U.
- Wu, L.H.
- Wu, N.
- Wu, S.X.
- Wu, W.
- Wu, Z.
- Xia, L.G.
- Xiao, Z.J.
- Xie, Y.G.
- Xiu, Q.L.
- Xu, G.F.
- Xu, G.M.
- Xu, H.
- Xu, Q.J.
- Xu, X.P.
- Xu, Y.
- Xu, Z.R.
- Xue, F.
- Xue, Z.
- Yan, L.
- Yan, W.B.
- Yan, Y.H.
- Yang, H.X.
- Yang, T.
- Yang, Y.
- Yang, Y.X.
- Ye, H.
- Ye, M.
- Ye, M.H.
- Yu, B.X.
- Yu, C.X.
- Yu, J.S.
- Yu, S.P.
- Yuan, C.Z.
- Yuan, W.L.
- Yuan, Y.
- Zafar, A.A.
- Zallo, A.
- Zeng, Y.
- Zhang, B.X.
- Zhang, B.Y.
- Zhang, C.C.
- Zhang, D.H.
- Zhang, H.H.
- Zhang, H.Y.
- Zhang, J.
- Zhang, J.G.
- Zhang, J.Q.
- Zhang, J.W.
- Zhang, J.Y.
- Zhang, J.Z.
- Zhang, L.
- Zhang, S.H.
- Zhang, T.R.
- Zhang, X.J.
- Zhang, X.Y.
- Zhang, Y.
- Zhang, Y.H.
- Zhang, Y.S.
- Zhang, Z.P.
- Zhang, Z.Y.
- Zhao, G.
- Zhao, H.S.
- Zhao, J.W.
- Zhao, K.X.
- Zhao, L.
- Zhao, L.
- Zhao, M.G.
- Zhao, Q.
- Zhao, S.J.
- Zhao, T.C.
- Zhao, X.H.
- Zhao, Y.B.
- Zhao, Z.G.
- Zhemchugov, A.
- Zheng, B.
- Zheng, J.P.
- Zheng, Y.H.
- Zheng, Z.P.
- Zhong, B.
- Zhong, J.
- Zhou, L.
- Zhou, X.K.
- Zhou, X.R.
- Zhu, C.
- Zhu, K.
- Zhu, K.J.
- Zhu, S.H.
- Zhu, X.L.
- Zhu, X.W.
- Zhu, Y.M.
- Zhu, Y.S.
- Zhu, Z.A.
- Zhuang, J.
- Zou, B.S.
- Zou, J.H.
- Zuo, J.X.
DOIAbstract
The decays $J/{\psi}{\rightarrow}p\bar{p}$ and $J/{\psi}{\rightarrow}n\bar{n}$ have been investigated with a sample of $225.2×10^6$ $J/{\psi}$ events collected with the BESIII detector at the BEPCII $e^+e^-$ collider. The branching fractions are determined to be $\mathscr{B}(J/{\psi}{\rightarrow}p\bar{p})=(2.112±0. 004±0.031)×10^{-3}$ and $\mathscr{B}(J/{\psi}{\rightarrow}n\bar{n})=(2.07±0.01±0.17)×10^{-3}$. Distributions of the angle $\theta$ between the proton or antineutron and the beam direction are well described by the form $1+\alpha cos2\theta$, and we find $\theta=0.595±0.012±0.015$ for $J/{\psi}{\rightarrow}p\bar{p}$ and $\theta=0.50±0.04±0.21$ for $J/{\psi}{\rightarrow}n\bar{n}$. Our branching-fraction results suggest a large phas...
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