%0 Journal Article
%T Hidden-charm pentaquark state in Lambda(0)(b) -> J/psi p pi(-) decay
%A Wang, E.
%A Chen, H. X.
%A Geng, L. S.
%A Li, D. M.
%A Oset, E.
%J Physical Review D
%D 2016
%V 93
%N 9
%I Amer Physical Soc
%@ 2470-0010
%G English
%F Wang_etal2016
%O WOS:000375655000003
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=2668), last updated on Thu, 05 Dec 2019 22:32:38 +0000
%X We study here the A(b)(0) -> J/psi p pi(-) reaction in analogy to the A(b)(0) -> J/psi pK(-) one, and we note that in both decays there is a sharp structure (dip or peak) in the J/psi p mass distribution around 4450 MeV, which is associated in the A(b)(0) -> J/psi pK(-) experiment to an exotic pentaquark baryonic state, although in J/psi p pi(-) it shows up with relatively low statistics. We analyze the A(b)(0) -> J/psi p pi(-) interaction along the same lines as the A(b)(0) -> J/psi pK(-) one, with the main difference stemming from the reduced Cabibbo strength in the former and the consideration of the pi(-)p final state interaction instead of the K(-)p one. We find that with a minimal input, introducing the pi(-)p and J/psi p interaction in S-wave with realistic interactions, and the empirical P-wave and D-wave contributions, one can accomplish a qualitative description of the pi(-)p and J/psi p mass distributions. More importantly, the peak structure followed by a dip of the experimental J/psi p mass distribution is reproduced with the same input as used to describe the data of A(b)(0) -> J/psi pK(-) reaction. The repercussion for the triangular singularity mechanism, invoked in some works to explain the pentaquark peak, is discussed.
%R 10.1103/PhysRevD.93.094001
%U http://arxiv.org/abs/1512.01959
%U https://doi.org/10.1103/PhysRevD.93.094001
%P 094001-10pp