e(+)e(-) production in pA reactions at SIS energies

Detailed predictions for dilepton production from pA reactions at SIS energ ies are presented within a semiclassical BUU transport model that includes the off-shell propagation of vector mesons nonperturbatively and calculates the width of the vector mesons dynamically. Different scenarios of in-medi um modifications of vector mesons, such as collisional broadening and dropp ing vector-meson masses, are investigated and the possibilities for an expe rimental observation of in-medium effects in pA reactions at 1-4 GeV are di scussed for a variety of nuclear targets. (C) 2001 Elsevier Science B.V. Al l rights reserved.