Next-to-Leading QCD Factorization for Semi-Inclusive Deep Inelastic Scattering at Twist-4
arXiv:1310.6759 · doi:10.1103/PhysRevLett.112.102001
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 collisions, as well as lepton pair production in 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.
5 pages, 1 figure, published version in PRL
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