Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2004-12-13
Phys.Rev.C71:064903,2005; Erratum-ibid.C75:059901,2007
Physics
Nuclear Physics
Nuclear Theory
Revised version as accepted for publication in Phys. Rev. C
Scientific paper
10.1103/PhysRevC.71.064903
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 non-perturbative 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.
Renk Thorsten
Ruppert Jorg
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