$J/\psi$ photoproduction and polarization in $e+p$ collisions in the improved color evaporation model

TL;DR

This paper models the production and polarization of direct J/ψ mesons in electron-proton collisions using the improved color evaporation model, providing predictions for various kinematic variables and polarization parameters.

Contribution

It introduces a detailed calculation of J/ψ production and polarization within the improved color evaporation model in e+p photoproduction, including polarization frame analysis.

Findings

Agreement with experimental unpolarized cross sections

Successful description of polarization parameters as a function of transverse momentum

Predictions for polarization in different reference frames

Abstract

We calculate the production and polarization of direct $J/\psi$ in the improved color evaporation model in $e+p$ photoproduction. We present the production as functions of transverse momentun, mass of the hadronic final state, and inelasticity. We also present the polarization parameters $\lambda_\vartheta$, $\lambda_{\varphi}$, and $\lambda_{\vartheta \varphi}$ in the helicity and the Collins-Soper frames, as well as the frame-invariant polarization parameter $\tilde{\lambda}$ as a function of transverse momentum and inelasticity. We find agreement with both $J/\psi$ unpolarized cross sections and the invariant polarization parameters as a function of $p_T$.