Azimuthal asymmetry in SIDIS off nuclei as probe for $\hat q$

TL;DR

This paper proposes using the azimuthal asymmetry in SIDIS off nuclei as a sensitive probe to determine the fundamental transport parameter $\

Contribution

It introduces a twist-4 collinear approach to connect azimuthal asymmetry suppression with the energy loss parameter $\

Findings

Azimuthal asymmetry is suppressed by multiple scattering.

The suppression is sensitive to the value of $\

The method provides a new way to measure $\

Abstract

The energy loss parameter $\hat q$ is one of the fundamental transport parameters of hadronic matter. Using the twist-4 collinear approach, we show that the $\cos \phi$ azimuthal asymmetry in unpolarized semi-inclusive deeply inelastic scattering (SIDIS) off a large nucleus at intermediate transverse momentum is a sensitive observable for its determination. The effect is due to the suppression of the azimuthal asymmetry by final-state multiple scattering.