Thermal Radiation from Au + Au Collisions at \sqrt{s} = 200 GEV/A Energy

Abstract

The transverse momentum distribution of the direct photons measured by the PHENIX collaboration in $Au+Au$ collisions at $\sqrt{s}=200$ GeV/A has been analyzed. It has been shown that the data can be reproduced reasonably well assuming a deconfined state of thermalized quarks and gluons with initial temperature more than the transition temperature for deconfinement inferred from lattice QCD. The value of the initial temperature depends on the equation of state of the evolving matter. The sensitivities of the results on various input parameters have been studied. The effects of the modifications of hadronic properties at non-zero temperature have been discussed.

arXiv commentminor modifications in the text, accepted for publication

References in corpus (50)

• Quark Gluon Plasma an Color Glass Condensate at RHIC? The perspective from the BRAHMS experiment
• Identified Charged Particle Spectra and Yields in Au+Au Collisions at sqrt(s_NN) = 200 GeV
• Hadron production in nuclear collisions at RHIC and high density QCD
• Photon and Gluon Emission in Relativistic Plasmas
• Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results
• Absence of Suppression in Particle Production at Large Transverse Momentum in sqrt(s_NN) = 200 GeV d+Au Collisions
• Static quark anti-quark interactions in zero and finite temperature QCD. I. Heavy quark free energies, running coupling and quarkonium binding
• Photon Emission from Ultrarelativistic Plasmas
• Lattice Results on QCD Thermodynamics
• The transition temperature in QCD
• Hadronic Production of Thermal Photons
• Rho Meson Propagation and Dilepton Enhancement in Hot Hadronic Matter
• Chiral Restoration in Hot and/or Dense Matter
• Centrality Dependence of Direct Photon Production in sqrt(s_NN) = 200 GeV Au+Au Collisions
• Photon and dilepton production in supersymmetric Yang-Mills plasma
• Low-mass e+e- pair production in 158 A GeV Pb-Au collisions at the CERN SPS, its dependence on multiplicity and transverse momentum
• Observation of Direct Photons in Central 158 A GeV 208Pb+208Pb Collisions
• High energy photons from passage of jets through quark gluon plasma
• Bremsstrahlung and photon production in thermal QCD
• Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p + A Reactions
• Energy Loss of Leading Hadrons and Direct Photon production in Evolving Quark-Gluon Plasma
• Thermal Photons and Lepton Pairs from Quark Gluon Plasma and Hot Hadronic Matter
• On the Quasiparticle Description of Lattice QCD Thermodynamics
• Landau-Pomeranchuk-Migdal effect in thermal field theory
• Effects of in-medium vector meson masses on low-mass dileptons from SPS heavy-ion collisions
• Anisotropy of flow and the order of phase transition in relativistic heavy ion collisions
• Observation of $\rho /\omega$ Meson Modification in Nuclear Matter
• Hard Thermal Photon Production in Relativistic Heavy Ion Collisions
• Status of Chemical Freeze-Out
• Photons from Pb-Pb Collisions at CERN SPS
• Velocity of sound in relativistic heavy-ion collisions
• Photon emission in heavy ion collisions at the CERN SPS
• KLN theorem, magnetic mass, and thermal photon production
• Induced photon emission from quark jets in ultrarelativistic heavy-ion collisions
• Probing the QCD equation of state with thermal photons in nucleus-nucleus collisions at RHIC
• The $\pi \pi$ interaction in nuclear matter from a study of the ${\pi }^{+}A\to {\pi }^{+}{\pi }^{\pm }{A}^{\prime }$ reactions
• Hard photon production rate of a quark-gluon plasma at finite quark chemical potential
• Photons from Hadronic Matter at Finite Temperature
• Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data
• Electromagnetic Radiation from Hot and Dense Hadronic Matter
• Emission of thermal photons and the equilibration time in Heavy-Ion collisions
• A unique large thermal source of real and virtual photons in the reactions Pb(158 AGeV) + Pb, Au
• Quark Gluon Plasma Diagnostics in a Successive Equilibrium Scenario
• Equation of state from lattice QCD
• Rate of photon production from hot hadronic matter
• Subthreshold rho^0 photoproduction on 3He
• Spectral Red-Shift Versus Broadening from Photon and Dilepton Spectra
• First results from NA60 on low mass muon pair production in In-In collisions at 158 GeV/nucleon
• Thermal Radiation from Nucleons and Mesons
• No CPT Violation from Tilted Brane in Neutral Meson--Antimeson Systems

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