Dilepton production from $\rho$-mesons in a quark-gluon plasma

M.H. Thoma; S. Leupold; U. Mosel

doi:doi:10.1007/PL00013601

EPJ

Dilepton production from $\rho$ -mesons in a quark-gluon plasma

M.H. Thoma^1,2 - S. Leupold¹ - U. Mosel¹

¹ Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
² ECT*, Villa Tambosi, Strada delle Tabarelle 286, 38050 Villazzano (Trento), Italy

Received: 8 September 1999 / Revised version: 22 October 1999 Communicated by A. Schäfer

Abstract
Assuming that $\rho\>$ -mesons exist in a quark-gluon plasma at temperatures close to the QCD phase transition, we calculate the dilepton production rate from q- $\bar q$ annihilation via a $\rho\>$ -meson state using Vector Meson Dominance. The result is compared to the rates from direct q- $\bar q$ annihilation and from $\pi^+$ - $\pi^-$ annihilation. Furthermore we discuss the suppression of low mass dileptons if the quarks assume an effective mass in the quark-gluon plasma.