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VOLUME 87 (2008) | ISSUE 11 | PAGE 703
Failure of the collinear expansion in calculation of the induced gluon emission
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 [11aur-W1,11aur-W2] based on the collinear expansion is wrong. The nonzero gluon spectrum obtained in [11aur-W1,11aur-W2] is a consequence of unjustified neglecting some important terms in the collinear expansion.