Matter-induced modification of resonances at RHIC freezeout

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dc.creatorShuryak, E. V.
dc.creatorBrown, G. E.
dc.date2002-11-08
dc.date2002-11-18
dc.date.accessioned2026-07-07T10:33:11Z
dc.date.available2026-07-07T10:33:11Z
dc.descriptionWe discuss the physical effects causing a modification of resonance masses, widths and even shapes in a dilute hadronic gas at late stages of heavy ion collisions. We quantify the conditions at which resonances are produced at RHIC, and found that it happens at $T\approx 120 MeV$. Although in the pp case the ``kinematic'' effects like thermal weighting of the states is sufficient, in AA we see a clear effect of dynamical interaction with matter, both due to a variety of s-channel resonances and due to t-channel scalar exchanges. The particular quantity we focus mostly on is the $ρ$ meson mass, for which these dynamical effects lead to about -50 MeV shift, on top of about -20 MeV of a thermal effect: both agree well with preliminary data from STAR experiment at RHIC. We also predict a complete change of shape of $f_0(600)$ resonance, even by thermal effects alone.
dc.descriptionA comment about width modification added, some misspelling corrected
dc.identifierhttps://arxiv.org/abs/hep-ph/0211119
dc.identifierhttp://arxiv.org/abs/hep-ph/0211119
dc.identifierNucl.Phys.A717:322-335,2003
dc.identifierdoi:10.1016/S0375-9474(03)00672-9
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/179017
dc.subjectHigh Energy Physics - Phenomenology
dc.titleMatter-induced modification of resonances at RHIC freezeout
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