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Multiple parton scattering and induced parton energy loss are studied in deeply inelastic scattering (DIS) off nuclei. The effect of multiple scattering of a highly off-shell quark and the induced parton energy loss is expressed in terms of the modification to the quark fragmentation functions. We derive such modified quark fragmentation functions and their QCD evolution equations in DIS using the...
We analyze x F dependence of the Drell-Yan transverse momentum broadening in hadron-nucleus collisions. In terms of generalized factorization theorem, we show that the x F dependence of the transverse momentum broadening, Δ<q T2 >(x F ), can be calculated in perturbative QCD. We demonstrate that Δ<q T2 >(x F ) is a good observable...
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