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Double polarization observables in pentaquark photoproduction

Daniel Winney, Cristiano Fanelli, Alessandro Pilloni, Astrid N. Hiller Blin, Cesar Fernández-Ramírez, Miguel Albaladejo, Vincent Mathieu, Victor I. Mokeev, Adam P. Szczepaniak
We investigate the properties of the hidden-charm pentaquark-like resonances first observed by the LHCb Collaboration in 2015, by measuring the polarization transfer KLL between the incident photon and the outgoing proton in the exclusive photoproduction of J/psi near threshold. We present a first estimate of the sensitivity of this observable to the pentaquark photocouplings and hadronic branching ratios, and extend our predictions to the case of the initial-state helicity correlation ALL, using a polarized target. These results serve as a benchmark for the SBS experiment at Jefferson Lab, which proposes to measure for the first time the helicity correlations ALL and KLL in J/psi exclusive photoproduction, in order to determine the pentaquark photocouplings and branching ratios.
Date of publication: 
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Phys.Rev. D100 (2019) no.3, 034019