DOI 10.1007/s100529800843
A microscopic calculation of secondary Drell-Yan
production
in heavy ion collisions
C. Spieles1 - L. Gerland1 - N. Hammon1 - M. Bleicher1 - S.A. Bass1 - H. Stöcker1 - W. Greiner1 - C. Lourenço2 - R. Vogt3,4
1 Institut für
Theoretische Physik, J.W. Goethe-Universität,
D-60054 Frankfurt
am Main, Germany
2 CERN PPE, CH-1211 Geneva 23, Switzerland
3 Nuclear Science Division, LBNL, Berkeley, CA 94720, USA
4 Physics Department, University of California, Davis, CA 95616, USA
Received: 9 July 1997 / Revised version: 17 December 1997 / Published online: 10 March 1998
Abstract
A study of secondary Drell-Yan production in nuclear collisions is
presented for SPS energies. In
addition to the lepton pairs produced in
the initial collisions of the projectile and target nucleons, we
consider the potentially high dilepton yield from hard valence
antiquarks in produced mesons and antibaryons.
We calculate the secondary Drell-Yan
contributions taking the collision spectrum of hadrons from the
microscopic model URQMD. The contributions from meson-baryon
interactions, small in hadron-nucleus interactions, are
found to be substantial in nucleus-nucleus collisions at low
dilepton masses. Preresonance collisions of partons may further
increase the yields.
Copyright Springer-Verlag
