Is there window for "supersoft" Pomeron in $J/\psi$ photoproduction at low energy?

TL;DR

This paper investigates the low energy $J/C6$ photoproduction cross-section using a Pomeron model, introducing a new 'supersoft' Pomeron to reconcile discrepancies with experimental data and discussing polarization observables for future experiments.

Contribution

The study proposes a novel 'supersoft' Pomeron exchange to improve the description of low energy $J/C6$ photoproduction data beyond conventional models.

Findings

Introduction of a 'supersoft' Pomeron improves data fit.

Discussion of polarization observables to distinguish models.

Potential implications for understanding Pomeron exchanges.

Abstract

The low energy $J/\psi$ photoproduction cross-section has been studied on the basis of the Pomeron model. To incorporate the discrepancy between experimental data and the predictionns by the conventional models, i.e. the sum of the soft Pomeron with intercept 1.08 and the hard Pomeron with intercept 1.418, a Regge trajectory associated with a scalar meson (f,a) exchange which we call "supersoft" Pomeron, is introduced additionally. To distinguish between the conventional model and this new additional Pomeron, observations related to other polarization observables in upcoming polarized experiments are discussed.