Azimuthal decorrelation for photon induced dijet production in ultra-peripheral collisions of heavy ions

TL;DR

This paper investigates the azimuthal angular decorrelation of photon-induced dijet production in ultra-peripheral heavy ion collisions, employing QCD resummation techniques to match experimental data.

Contribution

It introduces a theoretical framework combining impact parameter dependent cross sections and Soft-Collinear Effective Theory for azimuthal decorrelation analysis.

Findings

Results align with ATLAS measurements

QCD resummation improves prediction accuracy

Provides detailed differential cross section analysis

Abstract

We study the azimuthal angular decorrelation of the dijet production via photon fusion in ultra-peripheral heavy ion collisions. The impact parameter dependent cross section of quark-antiquark pairs production is derived using the equivalent photon approximation, and the contribution from final-state QCD radiations to the azimuthal angular distribution are calculated within Soft-Collinear Effective Theory. We carry out the QCD resummation of large logarithms of the azimuthal angle as well as the jet radius at next-to-leading logarithmic accuracy. In the end we present the normalized differential cross section for azimuthal decorrelation of the dijet pair and find that our results are consistent with the measurements reported by the ATLAS collaboration.