We investigate the properties of the hidden-charm pentaquark-like resonances first observed by the LHCb Collaboration in 2015, by measuring the polarization transfer K-LL 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 A(LL), 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 A(LL) and K-LL in J/psi exclusive photoproduction, in order to determine the pentaquark photocouplings and branching ratios.

Double polarization observables in pentaquark photoproduction / Winney, D.; Fanelli, C.; Pilloni, A.; Blin, A.  N. Hiller; Fernández-Ramírez, C.; Albaladejo, M.; Mathieu, V.; Mokeev, V.  I.; Szczepaniak, A.  P.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 100:3(2019). [10.1103/PhysRevD.100.034019]

Double polarization observables in pentaquark photoproduction

Fanelli, C.;Pilloni, A.;
2019

Abstract

We investigate the properties of the hidden-charm pentaquark-like resonances first observed by the LHCb Collaboration in 2015, by measuring the polarization transfer K-LL 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 A(LL), 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 A(LL) and K-LL in J/psi exclusive photoproduction, in order to determine the pentaquark photocouplings and branching ratios.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1315842
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