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

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

1996-11-20

arxiv.org/abs/nucl-th/9611042v2

Nucl.Phys.A619:413-446,1997

Physics

Nuclear Physics

Nuclear Theory

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

Scientific paper

10.1016/S0375-9474(97)00140-1

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 $M \leq 1.4$ 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 $\leq M \leq$ 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.

Affiliated with

Also associated with

No associations

Rating

Dilepton Production from AGS to SPS Energies within a Relativistic Transport Approach does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Dilepton Production from AGS to SPS Energies within a Relativistic Transport Approach, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dilepton Production from AGS to SPS Energies within a Relativistic Transport Approach will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-310543