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 higher-twist 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
- E-Print:
- 10 pages, 2 eps figures