期刊
PHYSICS LETTERS B
卷 751, 期 -, 页码 572-575出版社
ELSEVIER
DOI: 10.1016/j.physletb.2015.11.016
关键词
-
资金
- National Center for Theoretical Sciences, National Science Council Taiwan [NSC-101-2112-M-007-006-MY3]
- MoST [MoST-104-2112-M-007-003-MY3]
- National Tsing Hua University [104N2724E1]
We study the three-body Lambda(b) decays of Lambda(b) -> J/psi pM with M= K- and pi(-). The two new states P-c1 equivalent to P-c(4380)(+) and P-c2 equivalent to P-c(4450)(+) observed recently as the resonances in the J/psi p invariant mass spectrum of Lambda(b) -> J/psi pK(-) can be identified to consist of five quarks, uudc (c) over bar, being consistent with the existence of the pentaquark states. We argue that, in the doubly charmful Lambda(b) decays of Lambda(b) -> J/psi pK(-) through b -> c (c) over bars, apart from those through the non-resonant Lambda(b) -> pK(-) and resonant Lambda(b) ->Lambda* -> pK(-) transitions, the third contribution with the non-factorizable effects is not the dominant part for the resonant Lambda(b) -> K P-c1,P-c2, P-c1,P-c2 -> J/psi p processes, such that we propose that the P-c1, (c2) productions are mainly from the charmless Lambda(b) decays through b ->(u) over bar us, in which the c (c) over bar content in P-c1,P- (c2) arises from the intrinsic charms within the Lambda(b) baryon. We hence predict the observables related to the branching ratios and the direct CP violating asymmetries to be B(Lambda(b) -> pi(-)(P-c1,P- (c2) ->) J/psi p)/B(Lambda(b) -> K-(P-c1,P-c2 ->) J/psi p) = 0.58 +/- 0.05, A(CP)(Lambda(b) -> pi(-)(P-c1,P-c2 ->)J/psi p) = (-7.4 +/- 0.9)%, and A(CP)(Lambda(b) -> K-(P-c1,P-c2 ->) J/psi p) =(+ 6.3 +/- 0.2)%, which can alleviate the inconsistency between the theoretical expectations from the three contributions in the doubly charmful Lambda(b) decays and the observed data. (C) 2015 The Authors. Published by Elsevier B.V.
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