TY  - JOUR
AU  - Roca, L.
AU  - Nieves, J.
AU  - Oset, E.
PY  - 2015
DA  - 2015//
TI  - LHCb pentaquark as a (D)over-bar*Sigma(c) – (D)over-bar*Sigma(c)* molecular state
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 094003
EP  - 6pp
VL  - 92
IS  - 9
PB  - Amer Physical Soc
AB  - We perform a theoretical analysis of the Lambda(b) -> J/psi K(-)p reaction from where a recent LHCb experiment extracts a Lambda(1405) contribution in the K(-)p spectrum close to threshold and two baryon states of hidden charm in the J/psi p spectrum. We recall that baryon states of this type have been theoretically predicted matching the mass, width and J(P) of the experiment; concretely some states built up from the J/psi N, (D) over bar*Lambda(c), (D) over bar*Sigma(c), (D) over bar Sigma(c)* and (D) over bar*Sigma(c)* coupled channels. We assume that the observed narrow state around 4450 MeV has this nature and we are able to describe simultaneously the shapes and relative strength of the the K(-)p mass distribution close to threshold and the peak of the J/psi p distribution, with values of the J/psi p coupling to the resonance in line with the theoretical ones. The nontrivial matching of many properties gives support to a J(P) = 3/2(-) assignment to this state and to its nature as a molecular state mostly made of (D) over bar*Sigma(c) and (D) over bar*Sigma(c)*.
SN  - 1550-7998
UR  - http://arxiv.org/abs/1507.04249
UR  - https://doi.org/10.1103/PhysRevD.92.094003
DO  - 10.1103/PhysRevD.92.094003
LA  - English
N1  - WOS:000364019700004
ID  - Roca_etal2015
ER  -