Azimuthal Angular Asymmetry of Soft Gluon Radiation in Jet Production

TL;DR

This paper studies how soft gluon radiation affects azimuthal angle correlations in jet production, revealing sizable asymmetries that vary across different collider processes and can be dominated by perturbative effects.

Contribution

It provides a detailed numerical analysis of azimuthal asymmetries induced by soft gluon resummation in various collider scenarios, highlighting the dominance of perturbative effects over initial asymmetries.

Findings

Sizable $ ext{cos}(oldsymbol{ extphi})$ and $ ext{cos}(2oldsymbol{ extphi})$ asymmetries are induced by soft gluon radiation.

The $ ext{cos}(2oldsymbol{ extphi})$ asymmetry can surpass primordial effects from linearly polarized gluons.

Asymmetries vary significantly across processes like ultraperipheral collisions, EIC, and LHC dijet production.

Abstract

We investigate the impact of soft gluon resummation on the azimuthal angle correlation between the total and relative momenta of two energetic final state particles (jets). We show that the initial and final state radiations induce sizable $\cos(\phi)$ and $\cos (2\phi)$ asymmetries in single jet and dijet events, respectively. We numerically evaluate the magnitude of these asymmetries for a number of processes in collider experiments, including diffractive dijet and dilepton production in ultraperipheral $pA$ and $AA$ collisions, inclusive and diffractive dijet production at the EIC and inclusive dijet production in $pp$ collisions at the LHC. In particular, the $\cos (2\phi)$ asymmetry of perturbative origin can dominate over the primordial asymmetry due to the linearly polarized gluon distribution.