Abstract
The mass shift Δ m ϱ and width broadening ΔΓ ϱ of ϱ mesons produced in heavy ion collisions is estimated using a general formula which relates the in-medium mass shift of a particle to the real part of the forward scattering amplitude Ref( E) of this particle on constituents of the medium and ΔΓ to the corresponding cross section. It is found that in high energy ( E/ A ⪸ 100 GeV) heavy ion collisions the ϱ width broadening is large and ϱ (or ω) peak could hardly be observed in + e −( μ + μ −) effective mass distributions. In low energy collisions ( E/ A ∼ a few GeV) a broad (a few hundred MeV) enhancement is expected at the position of the ϱ peak.
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