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

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

1998-07-09

arxiv.org/abs/hep-ph/9807301v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 2 figures (available from the authors), Latex using espcrc1.sty, presented at "QCD at Finite Baryon Density", April

Scientific paper

10.1016/S0375-9474(98)00511-9

The mass shift $\Delta m_{\rho}$ and width broadening $\Delta\Gamma_{\rho}$ of $\rho$ 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 $\Delta\Gamma$ to the corresponding cross section. It is found that in high energy ($E/A \ga 100~$GeV) heavy ion collisions the $\rho$ width broadening is large and $\rho$ (or $\omega$) peak could hardly be observed in $e^+e^-(\mu^+\mu^-)$ 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 $\rho$ peak.

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