Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-05-17
Z.Phys. C75 (1997) 119-126
Physics
Nuclear Physics
Nuclear Theory
16 pages, LaTeX, plus 7 postscript figures tarred, compressed and uuencoded in separate file
Scientific paper
We investigate the production of $e^+e^-$ pairs from $p + Be$ and nucleus-nucleus collisions from 2 GeV/A to 200 GeV/A within a covariant transport approach and focus on the dilepton angular anisotropies as a function of the dilepton invariant mass. Whereas the low mass regime yields information about the Dalitz decays of the $\Delta, \eta$ and $\omega$, above M $\approx $0.5 GeV the angular anisotropies provide additional information about the $\pi^+\pi^- \to \rho^0 \to e^+e^-$ channel in the medium. The anisotropy coefficient is found to change its sign for M $>$ 0.5 GeV in case of nucleus-nucleus reactions when increasing the bombarding energy from 2 GeV/A to 200 GeV/A which sheds some light on the $\pi \pi \to \rho$ dynamics.
Bratkovskaya Elena L.
Cassing Wolfgang
Mosel Ulrich
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