title: Production and elliptic flow of dileptons and photons in a matrix model of the quark-gluon plasma.
abstract: We consider a nonperturbative approach to the thermal production of dileptons and photons at temperatures near the critical temperature in QCD. The suppression of colored excitations at low temperature is modeled by including a small value of the Polyakov loop, in a "semi"-quark-gluon plasma (QGP). Comparing the semi-QGP to the perturbative QGP, we find a mild enhancement of thermal dileptons. In contrast, to leading logarithmic order in weak coupling there are far fewer hard photons from the semi-QGP than the usual QGP. To illustrate the possible effects on photon and dilepton production in heavy-ion collisions, we integrate the rate with a simulation using ideal hydrodynamics. Dileptons uniformly exhibit a small flow, but the strong suppression of photons in the semi-QGP tends to weight the elliptical flow of photons to that generated in the hadronic phase.
authors.affiliation: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.|Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, D-60438 Frankfurt am Main, Germany.
authors.forename: Charles
authors.initials: C
authors.lastname: Gale
authors.affiliation: Theoretical Research Division, Nishina Center, RIKEN, Wako 351-0198, Japan.
authors.forename: Yoshimasa
authors.initials: Y
authors.lastname: Hidaka
authors.affiliation: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.
authors.forename: Sangyong
authors.initials: S
authors.lastname: Jeon
authors.affiliation: RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Shu
authors.initials: S
authors.lastname: Lin
authors.affiliation: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Paquet
authors.affiliation: RIKEN/BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973, USA.|Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Robert D
authors.initials: RD
authors.lastname: Pisarski
authors.affiliation: Theoretical Research Division, Nishina Center, RIKEN, Wako 351-0198, Japan.|Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Satow
authors.affiliation: Department of Physics, Western Michigan University, 1903 West Michigan Avenue, Kalamazoo, Michigan 49008, USA.
authors.forename: Vladimir V
authors.initials: VV
authors.lastname: Skokov
authors.affiliation: Department of Physics, McGill University, 3600 University Street, Montreal, Quebec H3A 2T8, Canada.
authors.forename: Gojko
authors.initials: G
authors.lastname: Vujanovic