2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 7, 219-223

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

M.H. Thoma1,2 - 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.

PACS
25.75.-q Relativistic heavy-ion collisions - 12.38.Mh Quark-gluon plasma - 14.40.Cs Other mesons with S = C = 0, mass <2.5 GeV


Copyright Società Italiana di Fisica, Springer-Verlag 2000