Dilepton production and mT-scaling at BEVALAC/SIS energies

https://doi.org/10.1016/S0375-9474(98)00135-3Get rights and content

Abstract

We present a dynamical study of e+ e production in C+C and Ca+Ca collisions at BEVALAC/SIS energies on the basis of the covariant transport approach HSD employing momentum-dependent ϱ-meson spectral functions that include the pion modifications in the nuclear medium as well as the polarization of the p-meson due to resonant p-N scattering. We find that the experimental data from the DLS Collaboration cannot be described within the p-meson spectral function approach. A dropping η-mass scenario leads to a good reproduction of the DLS dilepton data, however, violates the mT-scaling of π0 and η spectra as observed by the TAPS Collaboration as well as η photoproduction on nuclei.

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    Work supported by BMBF and GSI Darmstadt.

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