Probing the {rho} spectral function in hot and dense nuclear matter by dileptons

Journal Article · Sun Feb 01 00:00:00 EST 1998 · Physical Review, C

DOI:https://doi.org/10.1103/PhysRevC.57.916· OSTI ID:568376

Cassing, W; Bratkovskaya, E L ^[1]; Rapp, R ^[2]; Wambach, J ^[3]

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1. Institut fuer Theoretische Physik, Universitaet Giessen D-35392 Giessen (Germany)
2. Department of Physics and Astronomy, State University of New York, Stony Brook, New York 11794-3800 (United States)
3. Insitut fuer Kernphysik, TU Darmstadt, Schlossgartenstrasse 9, D-64289 Darmstadt (Germany)

We present a dynamical study of e{sup +}e{sup {minus}} and {mu}{sup +}{mu}{sup {minus}} production in proton-nucleus and nucleus-nucleus collisions at CERN-SPS energies on the basis of the covariant transport approach HSD employing a momentum-dependent {rho}-meson spectral function that includes the pion modifications in the nuclear medium as well as the polarization of the {rho} meson due to resonant {rho}-N scattering. We find that the experimental data from the CERES and HELIOS-3 Collaborations can be described equally well as within the dropping {rho}-mass scenario. Whereas corresponding dilepton q{sub T} spectra are found to be very similar, the inclusive dilepton yield in the invariant mass range 0.85{le}M{le}1.0 GeV should allow us to disentangle the two scenarios experimentally. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 568376
• Journal Information: Physical Review, C, Vol. 57, Issue 2; Other Information: PBD: Feb 1998
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
PROTON REACTIONS
HEAVY ION REACTIONS
ELECTRONS
POSITRONS
MUONS PLUS
MUONS MINUS
PAIR PRODUCTION
POLARIZATION
RHO-770 MESONS
SPECTRAL FUNCTIONS
MASS
NUCLEAR MATTER