Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by Dileptons

Details Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by Dileptons Probing the Rho Spectral Function in Hot and Dense Nuclear Matter by Dileptons

1997-08-12

arxiv.org/abs/nucl-th/9708020v2

Phys.Rev.C57:916-921,1998

Physics

Nuclear Physics

Nuclear Theory

13 pages RevTeX slightly revised, 6 eps-figures

Scientific paper

10.1103/PhysRevC.57.916

We present a dynamical study of $e^+e^-$ and $\mu^+ \mu^-$ 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 $q_T$-spectra are found to be very similar, the inclusive dilepton yield in the invariant mass range $0.85 \leq M \leq 1.0$ GeV should allow to disentangle the two scenarios experimentally.

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