Derives four scattering kernels for quark energy loss in nuclei at NLO and NLT, incorporating Glauber quarks and gluons plus mass and coherence effects.
Failure of the collinear expansion in calculation of the induced gluon emission
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abstract
We demonstrate that the collinear expansion fails in the case of gluon emission from a fast quark produced in $eA$ DIS. In this approximation the N=1 rescattering contribution to the gluon spectrum vanishes. We show that the higher-twist approach by Guo, Wang and Zhang [4,5] based on the collinear expansion is wrong. The nonzero gluon spectrum obtained in [4,5] is a consequence of unjustified neglecting some important terms in the collinear expansion.
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Glauber quark and gluon contributions to quark energy loss at next-to-leading order and next-to-leading twist
Derives four scattering kernels for quark energy loss in nuclei at NLO and NLT, incorporating Glauber quarks and gluons plus mass and coherence effects.