Abstract
The LHCb has reported the observation of a resonancelike structure, the \(P_c(4450)\), 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 \(P_c(4450)\) signal in future JLab data. We present a first estimate of the upper limit for the branching ratio of the \(P_c(4450)\) 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 \(P_c(4450)\) structure in the future photoproduction experiments.
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Acknowledgements
This material is based upon work supported in part by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contracts DE-AC05-06OR23177 and DE-FG0287ER40365, National Science Foundation under grants PHY-1415459 and NSF-PHY-1205019, and IU Collaborative Research Grant. This work was supported by the Spanish Ministerio de Economía y Competitividad (MINECO) and the European fund for regional development (EFRD) under contracts Nos. FIS2014-51948-C2-2-P and SEV-2014-0398. It has also been supported by Generalitat Valenciana under contract PROMETEOII/2014/0068 and the Deutsche Forschungsgemeinschaft DFG.
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Hiller Blin, A.N., Fernández-Ramírez, C., Jackura, A. et al. Studying the \(P_c(4450)\) Resonance in \(J/\psi \) Photoproduction Off Protons. Few-Body Syst 59, 104 (2018). https://doi.org/10.1007/s00601-018-1426-3
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DOI: https://doi.org/10.1007/s00601-018-1426-3