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We show that the measurement of di-leptons might provide only a restrictedview into the most dense stages of heavy ion reactions. Thus, possible studiesof meson and baryon properties at high baryon densities, as e.g. done atGSI-HADES and envisioned for FAIR-CBM, might observe weaker effects thancurrently expected in certain approaches. We argue that the strong absorptionof resonances in the high baryon density region of the heavy ion collisionmasks information from the early hot and dense phase due to a strong increaseof the total decay width because of collisional broadening. To obtainadditional information, we also compare the currently used approaches toextract di-leptons from transport simulations - i.e. shining, only vectormesons from final baryon resonance decays and instant emission of di-leptonsand find a strong sensitivity on the method employed in particular at FAIR andSPS energies. It is shown explicitly that a restriction to rho meson (andtherefore di-lepton) production only in final state baryon resonance decaysprovide a strong bias towards rather low baryon densities. The resultspresented are obtained from UrQMD v2.3 calculations using the standard set-up.

How Sensitive are Di-Leptons from Rho Mesons to the High Baryon Density Region?