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.
Highlights
The exploration of the inner structure and properties of nuclear medium is of fundamental importance in nuclear science
From our global analysis presented below, we provide a quantitative evidence of the universality and kinematic dependence of the nuclear medium property within our scheme
We carried out the first global analysis of jet transport coefficient qfor cold nuclear matter within a generalized factorization framework and a well-motivated scheme
Summary
The exploration of the inner structure and properties of nuclear medium is of fundamental importance in nuclear science. In relativistic heavy ion collisions, of particular interest is the jet transport coefficient q. Qrepresents the transverse momentum broadening per unit length of an incoming jet encountered in a hot and dense medium, and describes the interaction strength between the hard probe and nuclear medium. The jet transport coefficient qhas become a standard quantity in searching for and to characterize the properties of the quark-gluon plasma [1]. Qis the key quantity in the study of jet quenching phenomena and parton energy loss, as it arises in all the theoretical descriptions of energetic probes in heavy ion collisions [2,3,4], which is remarkable
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