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arXiv · 2406.00070

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

Vincent Cheung·Ramona Vogt
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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 $p_T$.

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Vincent Cheung, Ramona Vogt. 2024-05-30. $J/\psi$ photoproduction and polarization in $e+p$ collisions in the improved color evaporation model. https://doi.org/10.1103/physrevd.110.094026

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