e+ e- pairs from pi- A reactions

Abstract

We calculate dilepton production for the reactions $π^-$C and $π^-$Pb at 1.3 GeV within a semi-classical BUU transport model and compare our results to a previously published calculation. We show that a modified treatment of the $ρ$-meson production and propagation gives substantially different results. We, furthermore, discuss uncertainties related to the electromagnetic decay of the $ρ$-meson and the elementary $π^- N \to e^+ e^- X$ channels.

12 pages, including 4 postscript figures