Transverse momentum broadening at NLO and QCD evolution of (q)over-cap

摘要

Within the framework of a high-twist approach, we show the first complete next-to-leading order calculation of transverse momentum broadening in semi-inclusive deeply inelastic e + A scattering and Drell-Yan dilepton production in p + A collisions. We demonstrate at one-loop level how QCD factorization holds for multiple scattering in a nuclear medium, and the universality of the associated quark-gluon correlation function. Our calculation also identifies a QCD evolution equation for the quark-gluon correlation function, which determines the QCD factorization scale and the energy dependence of the jet transport parameter (q) over cap. Published by Elsevier B.V.