Coherent energy loss effects in dihadron azimuthal angular correlations in Deep Inelastic Scattering at small $x$

TL;DR

This paper investigates how coherent, medium-induced energy loss influences dihadron azimuthal correlations in Deep Inelastic Scattering at small x, highlighting its significance and robustness against higher order corrections.

Contribution

It introduces the inclusion of coherent radiative energy loss in the Color Glass Condensate framework for DIS, demonstrating its impact on dihadron correlations.

Findings

Radiative cold-matter energy loss significantly affects back-to-back dihadron production.

The double ratio of coincidence probabilities is robust against higher order corrections.

Energy loss effects are crucial for understanding azimuthal correlations in small-x DIS.

Abstract

We perform an exploratory study of the role of coherent, medium-induced energy loss in azimuthal angular correlations in dihadron production in Deep Inelastic Scattering (DIS) at small $x$ where the target proton/nucleus is modeled as a Color Glass Condensate. In this approach coherent radiative energy loss is part of the higher order corrections to the leading order dihadron production cross section. We include the effects of both gluon saturation and coherent radiative energy loss and show that radiative cold-matter energy loss has a significant effect on the so-called coincidence probability for the back to back production of dihadrons in DIS. We also define a double ratio of coincidence probabilities for a nucleus and proton targets and show that it is very robust against higher order radiative corrections.