  
|
     
|
The European Physical Journal C
ISSN: 1434-6044 (printed version)
ISSN: 1434-6052 (electronic version)
Abstract Volume 5 Issue 2 (1998) pp 345-348
DOI 10.1007/s100529800855
theoretical physics:
Comment on "Infrared and pinching singularities in out of equilibrium QCD plasmas"
A. Niégawa
Department of Physics, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan (e-mail: niegawa@sci.osaka-cu.ac.jp)
Received: 27 October 1997 / Revised version: 9 January 1998 / Published online: 10 March 1998
Abstract. Analyzing the dilepton production from out of equilibrium quark-gluon plasma, Le Bellac and Mabilat have recently pointed out that, in the reaction rate, the cancellation of mass (collinear) singularities takes place only in physical gauges, and not in covariant gauges. They then have estimated the contribution involving pinching singularities. After giving a general argument for the gauge independence of the production rate, we explicitly confirm the gauge independence of the mass-singular part. The contribution involving pinching singularities develops mass singularities, which is also gauge dependent. This "additional" contribution to the singular part is responsible for the gauge independence of the "total" singular part.
Article in PDF-Format (221 KB)
Article in (gzipped) PS-Format (133 KB)
Online publication: August 25, 1998
LINK Helpdesk
© Springer-Verlag Berlin Heidelberg 1998