Power corrections to the electromagnetic spectral function and the dilepton rate in QCD plasma within operator product expansion in D=4

Abstract

We evaluate the electromagnetic spectral function in QCD plasma in a nonperturbative background of in-medium quark and gluon condensates by incorporating the leading order power corrections in a systematic framework within the ambit of the operator product expansion in D=4 dimension. We explicitly show that the mixing of the composite operators removes mass singularities and renders Wilson coefficients finite and well defined. As a spectral property, we then obtain the nonperturbative dilepton production rate from QCD plasma. The operator product expansion automatically restricts the dilepton rate to the intermediate mass range, which is found to be enhanced due to the power corrections. We also compare our result with those from nonperturbative calculations, e.g., lattice QCD and effective QCD models based on Polyakov loop.

24 pages, 8 figures; Discussion added on OPE scales, version accepted in JHEP

References in corpus (7)

• Electrical conductivity and charge diffusion in thermal QCD from the lattice
• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• Elliptic flow of thermal dileptons in relativistic nuclear collisions
• Low Mass Thermal Dilepton Production at NLO in a Weakly Coupled Quark-Gluon Plasma
• Interpolation of hard and soft dilepton rates
• Vector meson spectral function and dilepton production rate in a hot and dense medium within an effective QCD approach
• (Pseudo)Scalar Charmonium in Finite Temperature QCD