Spin-parity analysis of $p\bar{p}$ mass threshold structure in $J/\psi$ and $\psi (3686)$ radiative decays

Ablikim, M.; Achasov, M.N.; Alberto, D.; Ambrose, D.J.; An, F.F.; An, Q.; An, Z.H.; Bai, J.Z.; Baldini Ferroli, R.B.F.; Ban, Y.; Becker, J.; Berger, N.; Bertani, M.B.; Bian, J.M.; Boger, E.; Bondarenko, O.; Boyko, I.; Briere, R.A.; Bytev, V.; Cai, X.; Calcaterra, A.C.; 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.; Denysenko, I.; Destefanis, M.; Ding Ding, W.L.; Ding, Y.; Dong, L.Y.; Dong, M.Y.; Du, S.X.; Fang, J.; Fang, S.S.; Feng, C.Q.; Fu, C.D.; Fu, J.L.; Gao, Y.; Geng, C.; Goetzen, K.; Gong, W.X.; 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.; 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, 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, C.L.; Liu, C.X.; Liu, C.Y.; Liu, F.H.; Liu, F.; Liu, H.; Liu, H.B.; Liu, H.H.; Liu, H.M.; Liu, H.W.; Liu, J.P.; Liu, K.; Liu, K.Y.; Liu, Q.; Liu, S.B.; Liu, X.; Liu, X.H.; Liu, Y.B.; Liu, Y.; Liu, Z.A.; 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.; 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.; Muchnoi, N. Yu.; Nefedov, Y.; Nikolaev, I.B.; Ning, Z.; Olsen, S.L.; Ouyang, Q.; Pacetti, S.P.; Park, J.W.; Pelizaeus, M.; Peters, K.; Ping, J.L.; Ping, R.G.; Poling, R.; Pun, C.S.J.; Qi, M.; Qian, S.; Qiao, C.F.; Qin, X.S.; 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.; 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.; Wen, Q.G.; Wen, S.P.; Wiedner, U.; Wu, L.H.; Wu, N.; Wu, W.; Wu, Z.; 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, 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, S.P.; Yuan, C.Z.; Yuan, W.L.; Yuan, Y.; Zafar, A.A.; Zallo, A.Z.; Zeng, Y.; Zhang, B.X.; Zhang, B.Y.; Zhang, C.C.; Zhang, D.H.; Zhang, H.H.; Zhang, H.Y.; Zhang, J.; 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.; 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.S.; Zhu, Z.A.; Zhuang, J.; Zou, B.S.; Zou, J.H.; Zuo, J.X.

Spin-parity analysis of $p p ¯$ mass threshold structure in $J / ψ$ and $ψ (3686)$ radiative decays

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Date

2012

Authors

Baldini Ferroli, R.B.F.

Ban, Y.

Publisher

American Physical Society

Permanent Link

https://hdl.handle.net/2022/18708

Abstract

A partial wave analysis of the

p p ¯

mass-threshold enhancement in the reaction

J / ψ → γ p p ¯

is used to determine its

J PC

quantum numbers to be

0 −+

, its peak mass to be below threshold at

M =1832 −5 +19 (stat) −17 +18 (syst)±19(model)

MeV / c 2

, and its total width to be

Γ <76

MeV / c 2

at the 90% C.L. The product of branching ratios is measured to be

BR[J / ψ → γ X (p p ¯)]

BR[X (p p ¯)→ p p ¯]=[9.0 −1.1 +0.4 (stat) −5.0 +1.5 (syst)±2.3(model)] \times 10 −5

. A similar analysis performed on

ψ (3686)→ γ p p ¯

decays shows, for the first time, the presence of a corresponding enhancement with a production rate relative to that for

J / ψ

decays of

R =[5.08 −0.45 +0.71 (stat) −3.58 +0.67 (syst)±0.12(model)]

.

Keywords

Branching ratio, Partial wave analysis, Production rates, Quantum numbers, Radiative decay, Similar analysis, Atomic physics, Physics, Quantum theory

Citation

Ablikim, M., Achasov, M. N., Alberto, D., Ambrose, D. J., An, F. F., An, Q., . . . Zuo, J. X. (2012). Spin-parity analysis of

p p ¯

mass threshold structure in

J / ψ

and

ψ (3686)

radiative decays. Physical Review Letters, 108(11), 112003. http://dx.doi.org/10.1103/PhysRevLett.108.112003

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Spin-parity analysis of $p p ¯$ mass threshold structure in $J / ψ$ and $ψ (3686)$ radiative decays

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Spin-parity analysis of pp¯ mass threshold structure in J/ψ and ψ(3686) radiative decays

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Spin-parity analysis of $p p ¯$ mass threshold structure in $J / ψ$ and $ψ (3686)$ radiative decays