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Title

LHCb pentaquark as a (D)over-bar*Sigma(c) – (D)over-bar*Sigma(c)* molecular state

AuthorsRoca, Luis; Nieves, Juan Miguel ; Oset, Eulogi
KeywordsHidden gauge approach
Chiral dynamics
Baryon states
Resonances
Issue Date2-Nov-2015
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 92 (9): 094003 - 6 (2015)
AbstractWe 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)*.
Description4 pages.- 2 figures
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.92.094003
URIhttp://hdl.handle.net/10261/130581
DOI10.1103/PhysRevD.92.094003
ISSN1550-7998
E-ISSN1550-2368
Appears in Collections:(IFIC) Artículos
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