期刊
PHYSICAL REVIEW LETTERS
卷 124, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.124.072001
关键词
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资金
- National Natural Science Foundation of China (NSFC) [11621131001]
- Deutsche Forschungsgemeinschaft (DFG) [TRR110]
- NSFC [11835015, 11947302, 11961141012]
- Chinese Academy of Sciences (CAS) [QYZDB-SSW-SYS013, XDPB09]
- CAS Center for Excellence in Particle Physics (CCEPP)
- Munich Institute for Astro-and Particle Physics (MIAPP) of the DFG cluster of excellence Origin and Structure of the Universe
- Thousand Talents Plan for Young Professionals
- SCNU
- CAS President's International Fellowship Initiative (PIFI) [2018DM0034]
- VolkswagenStiftung [93562]
- Russian Science Foundation [18-12-00226]
- MINECO (Spain)
- FEDER [FPA2016-77313-P]
- Russian Science Foundation [18-12-00226] Funding Source: Russian Science Foundation
Three hidden-charm pentaquark P-c states, P-c(4312), P-c(4440), and P-c(4457) were revealed in the A(b)(0) -> J/psi pK(-) process measured by LHCb using both run I and run II data. Their nature is under lively discussion, and their quantum numbers have not been determined. We analyze the J/psi p invariant mass distributions under the assumption that the crossed-channel effects provide a smooth background. For the first time, such an analysis is performed employing a coupled-channel formalism with the scattering potential involving both one-pion exchange as well as short-range operators constrained by heavy quark spin symmetry. We find that the data can be well described in the hadronic molecular picture, which predicts seven Sigma((*))(c) (D) over bar ((*)) molecular states in two spin multiplets, such that the P-c(4312) is mainly a Sigma(c)(D) over bar bound state with J(P) = 1/2(-), while P-c(4440) and P-c(4457) are Sigma(c)(D) over bar* hound states with quantum numbers 3/2(-) and 1/2(-), respectively. We also show that there is evidence for a narrow Sigma(c)*(D) over bar hound state in the data which we call P-c(4380), different from the broad one reported by LHCb in 2015. With this state included, all predicted Sigma(c)(D) over bar, Sigma(c)*(D) over bar, and Sigma(c)(D) over bar* hadronic molecules are seen in the data, while the missing three Sigma(c)*(D) over bar* states are expected to be found in future runs of the LHC or in photoproduction experiments.
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