Perspectives of e(+)e(-) production in pp, pd and pBe reactions at SIS energies

We study dilepton production from pp, pd and pBe collisions from 1-5 GeV in cluding the pi (0), eta, omega and Delta Dalitz decays, direct decays of ve ctor mesons (rho, omega) as well as subthreshold rho production via baryoni c 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, overesti mate slightly the 'old' pBe data from that group. Furthermore, detailed pre dictions for differential dilepton spectra at SIS energies are made with a high mass resolution that can be controlled experimentally by the HADES col laboration in near future. (C) 2001 Elsevier Science B.V. All rights reserv ed.