Can high-$p_\perp$ theory and data constrain $\eta/s$?

TL;DR

This paper explores how high-$p_ot$ data and theory can better constrain the temperature dependence of the shear viscosity to entropy ratio in QCD matter, complementing low-$p_ot$ studies.

Contribution

It introduces a novel approach using high-$p_ot$ energy loss data to impose constraints on $ ext{eta}/s(T)$, enhancing understanding of QCD matter properties.

Findings

High-$p_ot$ data effectively constrain $ ext{eta}/s(T)$.

Dynamical energy loss models improve temperature dependence estimates.

Results suggest high-$p_ot$ observables are valuable for QCD medium characterization.

Abstract

Understanding the temperature dependence of the specific shear viscosity $(\eta/s)$ is crucial for characterizing the properties of the QCD matter produced in ultrarelativistic heavy-ion collisions. Since, low-$p_\perp$ theory and data are only weakly sensitive to the typical forms of $\eta/s(T)$, especially at high temperatures, we use high-$p_\perp$ data and theory to impose additional constraints on it. Our approach, based on dynamical radiative and collisional energy loss of high-$p_\perp$ particles, provides promising results in constraining the temperature dependence of $\eta/s$.