Low mass dilepton radiation at RHIC

Abstract

In this work we discuss the emission of low mass dilepton radiation from a hydrodynamic evolution model of Au-Au collisions and make comparisons with recent PHENIX measurements. The dilepton emission rates from the hadronic phase are treated at finite temperature and baryon density and are completely constrained by broken chiral symmetry in a density expansion. The rates are expressed in terms of vacuum correlators which are measured in $e^{+}{e}^{-}$ annihilation, $\tau$ decays and photo-reactions on nucleons and nuclei. We consider two possibilities for the hadronic phase: A chemical equilibrated an off equilibrium hadronic gas. We find that while chemical off-equilibrium helps explain part of the low mass (0.15 $\le$ M GeV $\le$ 0.7) enhancement seen in the data there is still a large discrepancy.

8 pages, 12 figures

References in corpus (5)

• First Measurement of the rho Spectral Function in High-Energy Nuclear Collisions
• Comprehensive Interpretation of Thermal Dileptons at the SPS
• NA60 results on the rho spectral function in In-In collisions
• Thermal Dimuon Yields at NA60
• First measurement of the rho spectral function in nuclear collisions

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• Dilepton excess from local parity breaking in baryon matter
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• Dileptons in Heavy-Ion Collisions
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• Kelvin-Helmholz instability in high energy heavy ion collisions
• Master formula approach to broken chiral U(3)xU(3) symmetry
• The Extraordinary Glow
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