Failure of the collinear expansion in the calculation of the induced gluon emission
Abstract
The collinear expansion is demonstrated to fail in the case of the gluon emission from a fast quark produced in eA deep inelastic scattering. In this approximation, the N = 1 rescattering contribution to the gluon spectrum vanishes. It has been shown that the highertwist approach by X. N. Wang and X. Guo, Nucl. Phys. A 696, 788 (2001) and B. W. Zhang and X. N. Wang, Nucl. Phys. A 720, 429 (2003) based on the collinear expansion is wrong. The nonzero gluon spectrum obtained in those works is a consequence of an unjustified neglect of some important terms in the collinear expansion.
 Publication:

Soviet Journal of Experimental and Theoretical Physics Letters
 Pub Date:
 August 2008
 DOI:
 10.1134/S0021364008110039
 arXiv:
 arXiv:0804.4282
 Bibcode:
 2008JETPL..87..605A
 Keywords:

 12.38.Bx;
 12.39.St;
 13.87.Ce;
 High Energy Physics  Phenomenology
 EPrint:
 10 pages, 2 eps figures