Perspectives of $e^{+}{e}^{-}$ production in pp, pd and p Be reactions at SIS energies

Abstract

We study dilepton production from pp, pd and p Be collisions from 1 - 5 GeV including the ${\pi }^0$, $\eta$, $\omega$ and $\Delta$ Dalitz decays, direct decays of vector mesons ($\rho$, $\omega$) as well as subthreshold $\rho$ production via baryonic resonances (e.g. $D_{13}(1520),P_{11}(1710)$). Our calculations compare rather well with the pp and pd data from the DLS Collaboration, however, overestimate slightly the 'old' p Be data from that group. Futhermore, detailed predictions for differential dilepton spectra at SIS energies are made with a high mass resolution that can be controlled experimentally by the HADES Collaboration in near future.

Comments: 27 pages, LaTeX, including 13 postscript figures, to be published in Nucl. Phys. A