TY  - JOUR
AU  - Wang, E.
AU  - Chen, H. X.
AU  - Geng, L. S.
AU  - Li, D. M.
AU  - Oset, E.
PY  - 2016
DA  - 2016//
TI  - Hidden-charm pentaquark state in Lambda(0)(b) -> J/psi p pi(-) decay
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 094001
EP  - 10pp
VL  - 93
IS  - 9
PB  - Amer Physical Soc
AB  - 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.
SN  - 2470-0010
UR  - http://arxiv.org/abs/1512.01959
UR  - https://doi.org/10.1103/PhysRevD.93.094001
DO  - 10.1103/PhysRevD.93.094001
LA  - English
N1  - WOS:000375655000003
ID  - Wang_etal2016
ER  -