Chiral symmetry breaking and confinement effects on dilepton and photon production around $T_c$

Abstract

Production rates of dileptons and photons from the quark-gluon (QGP) phase are calculated taking into account effects of confinement and spontaneous chiral symmetry breaking (χSB) not far from the transition temperature $T_c$. We find that the production rates of dileptons with large momenta and of photons originating from the QGP around $T_c$ are suppressed by the χSB effect. We also discuss to what extent information about details of the chiral transition, such as its characteristic temperature range and the steepness of the crossover, are reflected in these quantities.

15 pages, 11 figures; v2: figures 11 and 12 are added, discussion on comparison with other results is added in summary; v3: Typos in reference 36 are corrected