Meson and di-electron production with HADES

Abstract

The HADES experiment, installed at GSI, Darmstadt, measures di-electron production in A_s16A, p/pi_s16N and p/pi_s16A collisions. Here, the pi0 and eta Dalitz decays have been reconstructed in the exclusive p_s16p reaction at 2.2 GeV to form a reference cocktail for long-lived di-electron sources. In the C_s16C reaction at 1 and 2 GeV/u, these long-lived sources have been subtracted from the measured inclusive e_s16e- yield to exhibit the signal from the early phase of the collision. The results suggest that resonances play an important role in dense nuclear matter.