Dilepton Production from AGS to SPS Energies within a Relativistic Transport Approach

Abstract

We present a nonperturbative dynamical study of $e^{+}{e}^{-}$ production in proton-nucleus and nucleus-nucleus collisions from AGS to SPS energies on the basis of the covariant transport approach HSD. For p + Be reactions the dilepton yield for invariant masses $M\le 1.4$ GeV is found to be dominated by the decays of the $\eta ,\rho ,\omega$ and $\Phi$ mesons at all energies from 10 -- 450 GeV. For nucleus-nucleus collisions, however, the dilepton yield shows an additional large contribution from ${\pi }^{+}{\pi }^{-}$, $K^{+}{K}^{-}$ and $\pi \rho$ channels. Systematic studies are presented for the 'free' meson mass scenario in comparison to a 'dropping' meson mass scenario at finite baryon density. We find that for 'dropping' meson masses the invariant dilepton mass range 0.35 GeV $\le M\le$ 0.65 GeV is increased in comparison to the 'free' meson mass scenario and that the data of the CERES-collaboration for nucleus-nucleus collisions can be described much better within the 'dropping' mass scheme. We study in detail the contributions from the various dilepton channels as a function of the transverse momentum and rapidity of the lepton pair as well as a function of the charged particle multiplicity. Furthermore, various direct photon channels for S + Au at 200 GeV/u are computed and found to be well below the upper bounds measured by the WA80-collaboration.

38 pages, LaTeX, including 19 postscript figures, to appear in Nucl. Phys. A

References in corpus (4)

• Kaon versus Antikaon Production at SIS Energies
• Dilepton Production at SPS-energy Heavy Ion Collisions
• Enhancement of low-mass dileptons in SPS heavy-ion collisions: possible evidence for dropping rho meson mass in medium
• Formalism for dilepton production via virtual photon bremsstrahlung in hadronic reactions

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