Di-electron spectroscopy in CBM

The emission of lepton pairs out of the hot and dense collision zone of heavy ion reactions is a promising probe to study the electromagnetic structure of hadrons under extreme conditions. The reconstruction of low-mass vector mesons (ρ, ω, φ) is one of the prime tasks of the CBM experiment. In this report, we present the status of simulations of the electron pair measurement in CBM and compare the expected performance to that of previous or existing dilepton experiments. The general challenge of di-electron measurements in heavy-ion collisions is to cope with the large background of electrons originating from other than the desired sources. This is in particular difficult in the CBM spectrometer since electron identification is not provided in front of the magnetic field required for tracking. This leads to a considerable material budget in front of the RICH detector.