2006/09/11 by S. V. Suryanarayana, Suryanarayana, S. V.
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/0609096
In nuclear physics journals and arxiv listings, my name used to appear as S.V.S. Sastry. Hereafter (by deleting Sastry), my name will appear as, S.V. Suryanarayana
arxiv created 2006/09/11 · openalex publication_date 2006/09/11 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Variational method has been applied to estimate Landau-Pomeranchuk-Migdal (LPM) effects on virtual photon emission from the quark gluon plasma as a function of photon mass. The variational method was well tested for the LPM effects in real photon emission by Arnold et. al., For virtual photons, LPM effects arising from multiple scatterings of quarks in the plasma are determined by the integral equations for the transverse vector function (\bf f(p_⊥)) and the longitudinal function (g(\bf p_⊥)). We extended the variational method to solve these transverse and longitudinal equations for a variable set \p0,q0,Q2\, considering bremsstrahlung and \bf aws processes. We solved these equations, also by the self consistent iterations for comparing with the results of variational method. In order to estimate the variational parameter, we obtained empirical fits for the peak positions of the \bf p_⊥⋅f(p_⊥), p_⊥g(\bf p_⊥) distributions from iteration method. We propose that the optimized variational parameter for virtual photon emission is approximately equal to these empirical peak position values. The detailed study showed that the variational method gives reliable results for LPM effects on virtual photon emission for photon virtuality of the order Q2/T2≤ 100. At low Q2, the peak positions for p_⊥ distributions of transverse vector functions for virtual photons nearly coincide with the peak positions of corresponding distributions of real photons. We calculated imaginary part of photon retarded polarization tensor as a function of Q2/T2 using empirical variational parameters.