title: Next-to-leading order QCD factorization for semi-inclusive deep inelastic scattering at twist 4.
abstract: Within the framework of a high-twist approach, we calculate the next-to-leading order (NLO) perturbative QCD corrections to the transverse momentum broadening in semi-inclusive hadron production in deeply inelastic e+A collisions, as well as lepton pair production in p+A collisions. With explicit calculations of both real and virtual contributions, we verify, for the first time, the factorization theorem at twist 4 in NLO for the nuclear-enhanced transverse momentum weighted differential cross section and demonstrate the universality of the associated twist-4 quark-gluon correlation function. We also identify the QCD evolution equation for the twist-4 quark-gluon correlation function in a large nucleus, which can be solved to determine the scale dependence of the jet transport parameter in the study of jet quenching.
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Zhong-Bo
authors.initials: ZB
authors.lastname: Kang
authors.affiliation: Institute of Particle Physics and Key Laboratory of Lepton and Quark Physics (MOE), Central China Normal University, Wuhan 430079, China.
authors.forename: Enke
authors.initials: E
authors.lastname: Wang
authors.affiliation: Institute of Particle Physics and Key Laboratory of Lepton and Quark Physics (MOE), Central China Normal University, Wuhan 430079, China and Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
authors.forename: Xin-Nian
authors.initials: XN
authors.lastname: Wang
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA and Institute of Particle Physics and Key Laboratory of Lepton and Quark Physics (MOE), Central China Normal University, Wuhan 430079, China and Interdisciplinary Center for Theoretical Study and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China.
authors.forename: Hongxi
authors.initials: H
authors.lastname: Xing