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In-medium modification of $ρ$-mesons produced in heavy ion collisions

V. L. Eletsky·B. L. Ioffe·J. I. Kapusta
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Abstract

The mass shift $Δm_ρ$ 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 ${\rm Re} f(E)$ of this particle on constituents of the medium and $ΔΓ$ to the corresponding cross section. It is found that in high energy ($E/A \ga 100~$GeV) heavy ion collisions the $ρ$ width broadening is large and $ρ$ (or $ω$) peak could hardly be observed in $e^+e^-(μ^+μ^-)$ effective mass distributions. In low energy collisions ($E/A \sim$ a few GeV) a broad (a few hundred MeV) enhancement is expected at the position of the $ρ$ peak.

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V. L. Eletsky, B. L. Ioffe, J. I. Kapusta. 1998-07-09. In-medium modification of $ρ$-mesons produced in heavy ion collisions. https://doi.org/10.1016/s0375-9474(98)00511-9

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