$\eta_{Q}$ meson photoproduction in ultrarelativistic heavy ion collisions

TL;DR

This paper investigates the production of $ ext{η}_Q$ mesons in ultrarelativistic heavy ion collisions, highlighting the significance of photoproduction processes and gluon interactions within the NRQCD framework at LHC energies.

Contribution

It provides a detailed calculation of $ ext{η}_c$ and $ ext{η}_b$ meson production via photoproduction, including color singlet and octet contributions, emphasizing their relevance at LHC energies.

Findings

Photoproduction processes significantly contribute to heavy quarkonium production at mid-rapidity.

Gluon-gluon interactions via photoproduction are non-negligible in p-p and Pb-Pb collisions at LHC.

NRQCD framework effectively describes the production mechanisms of heavy quarkonia.

Abstract

The transverse momentum distributions for inclusive $\eta_{c,b}$ meson described by gluon-gluon interactions from photoproduction processes in relativistic heavy ion collisions are calculated. We considered the color singlet (CS) and color octet (CO) components with the framework of non-relativistic Quantum Chromodynamics (NRQCD) into the production of heavy quarkonium. The phenomenological values of the matrix elements for the color-singlet and color-octet components give the main contribution to the production of heavy quarkonium from the gluon-gluon interaction caused by the emission of additional gluon in the initial state. The numerical results indicate that the contribution of photoproduction processes cannot be negligible for mid-rapidity in p-p and Pb-Pb collisions at the Large Hadron Collider (LHC) energies.