Failure of the collinear expansion in calculation of the induced gluon emission

Details Failure of the collinear expansion in calculation of the induced gluon emission Failure of the collinear expansion in calculation of the induced gluon emission

2008-04-27

arxiv.org/abs/0804.4282v1

JETP Lett.87:605-610,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 eps figures

Scientific paper

10.1134/S0021364008110039

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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