Diffractive production of quarkonia

TL;DR

This paper explores the mechanisms of diffractive production of quarkonia, specifically eta' and J/psi, using perturbative QCD, photon fusion, and photoproduction data, highlighting the theoretical approaches and absorption effects involved.

Contribution

It presents a comparative analysis of diffractive production mechanisms for eta' and J/psi, linking perturbative QCD and photoproduction data to deepen understanding.

Findings

Diffractive pQCD approach applied to eta' production.

Photon fusion considered as an alternative mechanism.

Amplitude for J/psi production linked to HERA photoproduction data.

Abstract

I discuss two selected examples of diffractive production of quarkonia: $p p \to p \eta' p$ and $p p \to p J/\psi p$. In the first case I consider diffractive pQCD approach and $\gamma \gamma$ fusion, in the second case the amplitude is linked to the amplitude of the process for $J/\psi$ photoproduction at HERA. Absorption effects are discussed briefly for the second reaction.