Direct photon production from hadronic sources in high-energy heavy-ion collisions

Abstract

The low $p_T$ direct photon production from a variety of the hadronic sources is studied within the microscopic HSD transport approach for p+C, p+Pb and Pb+Pb collisions at 160 A GeV. The direct photon emission from elementary hadronic scatterings as well as meson-meson bremsstrahlung are incorporated. The influence of in-medium effects such as a collisional broadening of the vector-meson spectral functions on the photon emission rate is found to be hardly observable in the final spectra which are dominated by bremsstrahlung type processes. The uncertainties in the subtraction of the 'background' from the photon decay of hadronic resonances inside the hot and dense fireball is investigated, additionally. Our findings are relevant for the interpretation and extraction of experimental data on direct photon production at low $p_T$.

25 pages, 10 figures, to be published in Phys. Rev. C

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Cited by in corpus (24)

• Effective QCD and transport description of dilepton and photon production in heavy-ion collisions and elementary processes
• 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
• The Glasma, Photons and the Implications of Anisotropy
• Analysis of dilepton production in Au+Au collisions at sqrt(s_NN)=200 GeV within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Dilepton production in nucleus-nucleus collisions at top SPS energy within the Parton-Hadron-String Dynamics (PHSD) transport approach
• Photon elliptic flow in relativistic heavy-ion collisions: hadronic versus partonic sources
• Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions
• A Tale of Tails: Photon Rates and Flow in Ultra-Relativistic Heavy Ion Collisions
• Hybrid model calculations of direct photons in high-energy nuclear collisions
• Phenomenology of photon and di-lepton production in relativistic nuclear collisions
• Properties of strange vector mesons in dense and hot matter
• Direct photon calculations in heavy-ion collisions at s(NN)**1/2 = 62.4 - 200 AGeV in a (3+1) dimensional hybrid approach
• Photons from thermalizing matter in heavy ion collisions
• Photon radiation in hot nuclear matter by means of chiral anomalies
• Scaling properties of direct photon yields in heavy ion collisions
• On Extraction of Chemical Potentials of Quarks from Particle Transverse Momentum Spectra in High Energy Collisions
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• An Effective Model for Glueballs and Dual Superconductivity at Finite Temperature
• Dynamics of strongly interacting parton-hadron matter
• Soft Photons from transport and hydrodynamics at FAIR energies
• Direct photon emission from hadronic sources: Hydrodynamics vs. Transport theory