Multiplicity dependence of $\chi_{c}$ and $\chi_{b}$ meson production

TL;DR

This paper investigates the production of $oldsymbol{ ext{chi}_c}$ and $oldsymbol{ ext{chi}_b}$ mesons in proton-proton collisions using the color dipole model, comparing predictions with experimental data and analyzing multiplicity dependence.

Contribution

It provides the first detailed analysis of $ ext{chi}_c$ and $ ext{chi}_b$ meson production within the color dipole framework, including multiplicity dependence insights.

Findings

Estimated cross-sections align with experimental data.

Multiplicity dependence is milder for $ ext{chi}$ mesons than for $S$-wave quarkonia.

Results suggest new tests for quarkonia production mechanisms.

Abstract

In this paper we analyze in detail the production of the $\chi_{c}$ and $\chi_{b}$ mesons in $pp$ collisions. Using the color dipole framework, we estimated the cross-sections in the kinematics of ongoing and forthcoming experiments, and found that our estimates are in reasonable agreement with currently available experimental data. We also analyzed the dependence on multiplicity of co-produced hadrons and found that it is significantly milder than that of $S$-wave quarkonia. We expect that the experimental confirmation of this result could constitute an important test of our understanding of multiplicity enhancement mechanisms in the production of different quarkonia states.