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VOLUME 87 | ISSUE 11 | PAGE 703
Failure of the collinear expansion in calculation of the induced gluon emission
P. Aurenche, B. G. Zakharov+, H. Zaraket*

Laboratoire d'Annecy-le-Vieux de Physique Théorique LAPTH, F-74941 Annecy-le-Vieux Cedex, France +L.D. Landau Institute for Theoretical Physics RAS, 117940 GSP-1, 117334 Moscow, Russia *Lebanese University Faculty of Sciences (I), Hadeth-Beirut, Lebanon


PACS: 12.38.Bx, 12.39.St, 13.87.Ce
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 [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.


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