Thermal photons from heavy ion collisions: A spectral function approach

Abstract

We analyze the photon rates from a hadronic gas in equilibrium using chiral reduction formulas and a density expansion. The chiral reduction is carried to second order in the pion density which in principal includes all kinetic processes of the type $X\to \pi \gamma$ and $X\to \pi \pi \gamma$. The resulting rates are encoded in the form of vacuum correlation functions which are amenable to experiment. The hadronic rates computed in this work along with the known perturbative QGP rates are integrated over the space-time evolution of a hydrodynamic model tuned to hadronic observables. The resulting yields are compared to the recent photon and low mass dilepton measurements at the SPS and RHIC. Predictions for the LHC are made.

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Cited by in corpus (25)

• The production of photons in relativistic heavy-ion collisions
• Conformal anomaly as a source of soft photons in heavy ion collisions
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• Production and Elliptic Flow of Dileptons and Photons in the semi-Quark Gluon Plasma
• Centrality dependence of the direct photon yield and elliptic flow in heavy-ion collisions at sqrt(s)=200 GeV
• Hadronic and partonic sources of direct photons in relativistic heavy-ion collisions
• Direct real photons in relativistic heavy ion collisions
• Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
• Elliptic flow of thermal photons in heavy-ion collisions at Relativistic Heavy Ion Collider and Large Hadron Collider
• Photon production and elliptic flow from momentum-anisotropic quark-gluon plasma
• Electromagnetic Radiation in Hot QCD Matter: Rates, Electric Conductivity, Flavor Susceptibility and Diffusion
• Direct Photon Elliptic Flow at BNL Relativistic Heavy Ion Collider (RHIC) and CERN Large Hadron Collider (LHC)
• Nonprompt direct-photon production in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Dilepton production in p+p, Cu+Cu and Au+Au collisions at 200 AGeV
• Photons from thermalizing matter in heavy ion collisions
• Recent developments in the theory of electromagnetic probes in relativistic heavy-ion collisions
• Electromagnetic Radiation from QCD Matter: Theory Overview
• Scaling properties of direct photon yields in heavy ion collisions
• Out-of-equilibrium photon production and electric conductivity in a holographic Bjorken expanding plasma
• Photon radiation in hot nuclear matter by means of chiral anomalies
• Kelvin-Helmholz instability in high energy heavy ion collisions
• Low-mass dilepton production through transport process in quark-gluon plasma
• A Theoretic Review of Centrality-Dependent Direct Photon pt spectra in Au+Au Collisions at 200 GeV
• Dynamics of strongly interacting parton-hadron matter
• Centrality dependence of low-momentum direct-photon production in Au$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV