# A global extraction of the jet transport coefficient in cold nuclear matter

## TL;DR

This paper presents the first comprehensive global analysis of the jet transport coefficient in cold nuclear matter, integrating diverse experimental data to clarify its universality and scale dependence, with implications for understanding hot dense media.

## Contribution

It provides the first quantitative extraction of the jet transport coefficient $q$ in cold nuclear matter using a wide range of experimental data, clarifying its universality and scale dependence.

## Key findings

- Quantitative determination of $q$ in cold nuclear matter.
- Confirmation of the universality of $q$ across different processes.
- A parametrization of $q$ with potential impact on hot medium studies.

## Abstract

Within the framework of the generalized QCD factorization formalism, we perform the first global analysis of the jet transport coefficient ($\hat q$) for cold nuclear matter. The analysis takes into account the world data on transverse momentum broadening in semi-inclusive electron-nucleus deep inelastic scattering, Drell-Yan dilepton and heavy quarkonium production in proton-nucleus collisions, as well as the nuclear modification of the structure functions in deep inelastic scattering, comprising a total of 215 data points from 8 data sets. For the first time, we clarify quantitatively the universality and probing scale dependence of the nuclear medium property as encoded in $\hat q$. We expect that the determined parametrization of $\hat q$ in cold nuclear matter will have significant impact on precise identification of the transport property of hot dense medium created in heavy ion collisions.