Double Polarization Observables in Pentaquark Photoproduction
Abstract
We investigate the properties of the hidden charm pentaquark-like resonances first observed by LHCb 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 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.
Cite
@article{arxiv.1907.09393,
title = {Double Polarization Observables in Pentaquark Photoproduction},
author = {JPAC Collaboration and Daniel Winney and Cristiano Fanelli and Alessandro Pilloni and Astrid N. Hiller Blin and Cesar Fernandez-Ramirez and Miguel Albaladejo and Vincent Mathieu and Victor I. Mokeev and Adam P. Szczepaniak},
journal= {arXiv preprint arXiv:1907.09393},
year = {2019}
}
Comments
9 pages, 7 figures, 2 tables, Version published in PRD