Studying the Pc(4450) resonance in J/psi photoproduction off protons

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Abstract

The LHCb has reported the observation of a resonancelike structure, the Pc(4450), in the J/psi p invariant masses. In our work, we discuss the feasibility of detecting this structure in J/psi photoproduction, e.g. in the measurements that have been approved for the experiments in Hall A/C and in Hall B with CLAS12 at JLab. Also the GlueX Collaboration has already reported preliminary results. We take into account the experimental resolution effects, and perform a global fit to world J/psi photoproduction data in order to study the possibility of observing the Pc(4450) signal in future JLab data. We present a first estimate of the upper limit for the branching ratio of the Pc(4450) into the J/psi p channel, and we study the angular distributions of the differential cross sections. This will shed light on the nature and couplings of the Pc(4450) structure in the future photoproduction experiments.

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Formation of hidden-charm pentaquarks in photon-nucleon collisions

, (2015)

The cross section for formation in \(\gamma + p\) collisions of the recently found hidden-charm pentaquark states \(P_c(4380)\) and \(P_c(4450)\) is discussed and estimated. The studies of these resonances in photon beam experiments can be complementary to those in the LHCb experiment setting, and may be more advantageous for measurement of their additional decay channels. It is pointed out that both the relative importance of such decays and the yield of the resonances in the \(\gamma + p\) collisions are sensitive to the internal dynamics of the pentaquarks and can resolve between theoretical models. Specific numerical estimates are discussed within a simple `baryocharmonium' model, where the the observed \(P_c\) resonances are composites of \(J/\psi\) and excited nucleon states with the quantum numbers of \(N(1440)\) and \(N(1520)\).