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Parton Energy Loss and the Generalized Jet Transport Coefficient
We revisit radiative parton energy loss in deeply inelastic scattering (DIS)
off a large nucleus within the perturbative QCD approach. We calculate the
gluon radiation spectra induced by double parton scattering in DIS without
collinear expansion in the transverse momentum of initial gluons as in the
original high-twist approach. The final radiative gluon spectrum can be
expressed in terms of the convolution of hard partonic parts and unintegrated
or transverse momentum dependent (TMD) quark-gluon correlations. The TMD
quark-gluon correlation can be factorized approximately as a product of initial
quark distribution and TMD gluon distribution which can be used to define the
generalized or TMD jet transport coefficient. Under the static scattering
center and soft radiative gluon approximation, we recover the result by
Gylassy-Levai-Vitev (GLV) in the first order of the opacity expansion. The
difference as a result of the soft radiative gluon approximation is
investigated numerically under the static scattering center approximation.Comment: 33 pages in RevTeX with 30 figures, final version appeared in PRD
with additional typos correcte
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