Global extraction of the jet transport coefficient in cold nuclear matter

摘要

Within the framework of the generalized QCD factorization formalism, a set of nuclear-dependent observables all arise from the quark-gluon and gluon-gluon correlation functions, which are closely connected to the well-known jet transport coefficient ((q) over cap) for the nucleus. In this paper, we perform the first global analysis of (q) over cap for cold nuclear matter with a kinematics dependent parametrization. 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 datasets. Within our scheme, we clarify quantitatively the universality and kinematics dependence of the nuclear medium property as encoded in (q) over cap. We expect that the determined parametrization of (q) over cap in cold nuclear matter will have significant impact on precise identification of the transport property of hot dense medium created in heavy ion collisions.

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