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

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 $\cos \varphi$ 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.

Comments: 9 pages