Medium effects in the production and decay of $ω$- and $ρ$-resonances in pion-nucleus interactions

Details Medium effects in the production and decay of $ω$- and $ρ$-resonances in pion-nucleus interactions Medium effects in the production and decay of $ω$- and $ρ$-resonances in pion-nucleus interactions

1996-12-11

arxiv.org/abs/nucl-th/9612026v1

Phys.Lett. B396 (1997) 26-32

Physics

Nuclear Physics

Nuclear Theory

10 pages, LaTeX, plus 4 postscript figures, submitted to Phys. Lett. B

Scientific paper

10.1016/S0370-2693(97)00137-8

The $\omega$- and $\rho$-resonance production and their dileptonic decay in $\pi^- A$ reactions at GSI energies are calculated within the intranuclear cascade (INC) approach. The invariant mass distribution of the dilepton pair for each resonance is found to have two components which correspond to the decay of the resonances outside and inside the target nucleus. The latter components are strongly distorted by the nuclear medium due to resonance-nucleon scattering and a possible mass shift at finite baryon density. These medium modifications are compared to background sources in the dilepton spectrum from $\pi N$ bremsstrahlung and the Dalitz decays of $\Delta$'s and $\eta$ mesons produced in the reaction.

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