Collinear photon emission from the quark-gluon plasma: the light-cone path integral formulation
P. Aurenche, B. G. Zakharov+
LAPTH, Universitéde Savoie, CNRS, B.P. 110, F-74941 Annecy-le-Vieux Cedex, France
+L.D. Landau Institute for Theoretical Physics RAS, GSP-1, 117334 Moscow, Russia
We give a simple physical derivation of the
photon emission rate from the weakly coupled quark-gluon
plasma connected with the collinear processes
and . The analysis is based on the
light-cone path integral approach to the induced radiation.
Our results agree with that by Arnold, Moore and Yaffe (AMY) obtained using
the real-time thermal perturbation theory.
It is demonstrated that the solution of the AMY integral equation
is nothing but the time-integrated Green's function of the
light-cone path integral approach
written in the momentum representation.