Nonperturbative finite T broadening of the {rho} meson and dilepton emission in heavy-ion collisions

Journal Article · Wed Jun 01 04:00:00 EDT 2005 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.71.064903· OSTI ID:20698769

Ruppert, Joerg; Renk, Thorsten ^[1]

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1. Department of Physics, Duke University, Physics Building, Science Drive, Box 90305, Durham, North Carolina 27708-0305 (United States)

We study self-consistently the finite T broadening of the {rho} meson and its implications for dilepton emission in heavy-ion collisions. For this purpose finite width effects at finite temperature due to the {rho}-{pi} interaction are investigated in a self-consistent {phi}-functional approach. The temperature dependence of the {rho} meson and pion spectral functions and self-energies is discussed. The spectral functions show considerable broadening in comparison with a perturbative calculation on the one-loop level. Using these spectral functions, we make a comparison to dilepton emission data from the CERES NA49 Collaboration employing a parametrized fireball evolution model of collision. We demonstrate that these nonperturbative finite width effects are in-medium modifications relevant to the understanding of the enhancement of the low invariant mass spectrum of dileptons emitted in A-A collisions.

• OSTI ID: 20698769
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 6 Vol. 71; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
COMPARATIVE EVALUATIONS
ELECTRON EMISSION
FIREBALL MODEL
HEAVY ION REACTIONS
MASS SPECTRA
MESON-MESON INTERACTIONS
NUCLEAR MATTER
PIONS
RHO-770 MESONS
SELF-ENERGY
SPECTRAL FUNCTIONS
STRONG INTERACTIONS
TEMPERATURE DEPENDENCE