Multiparticle Production at Mid-Rapidity in the Color-Glass Condensate

TL;DR

This paper calculates multiple particle production cross sections at mid-rapidity within the color-glass condensate framework, providing new results for quark-antiquark pairs and gluons, with implications for heavy flavor and collective phenomena.

Contribution

It introduces new calculations for multiparticle production in the CGC effective field theory, including a mapping between quark-antiquark and gluon production cross sections, and discusses hadronization effects.

Findings

Derived cross sections for two quark-antiquark pairs and quark-antiquark pair plus gluon production.

Established a simple mapping between quark-antiquark and gluon production cross sections.

Provided explicit expressions for heavy flavor hadronization and discussed applications to correlations and flow.

Abstract

In this paper, we compute a number of cross sections for the production of multiple particles at mid-rapidity in the semi-dilute / dense regime of the color-glass condensate (CGC) effective field theory. In particular, we present new results for the production of two quark-antiquark pairs (whether the same or different flavors) and for the production of one quark-antiquark pair and a gluon. We also demonstrate the existence of a simple mapping which transforms the cross section to produce a quark-antiquark pair into the corresponding cross section to produce a gluon, which we use to obtain various results and to cross-check them against the literature. We also discuss hadronization effects in the heavy flavor sector, writing explicit expressions for the production of various combinations of $D$ and $\bar D$ mesons, $J/\psi$ mesons, and light hadrons. The various multiparticle cross sections presented here contain a wealth of information and can be used to study heavy flavor production, charge-dependent correlations, and "collective" flow phenomena arising from initial-state dynamics.