Centrality dependence of direct photons in Au + Au collisions atsNN=200GeV

2005/07/07 by R. J. Fries, Rainer J. Fries, Berndt Müller +3 · 3 citations
Medicine · Physics and Astronomy · #Centrality #Collider #High-Energy Particle Collisions Research #Momentum (technical analysis) #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Photon #Physics #Pion #Quantum mechanics #Spectral line #Urological Disorders and Treatments #Yield (engineering) #nucl-th

paper · pdf · doi:10.1103/physrevc.72.041902

published as Phys.Rev. C72 (2005) 041902 · RevTeX, 5 pages, 6 figures

arxiv created 2005/07/07 · openalex publication_date 2005/10/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We calculate the spectra of high-energy photons emitted in relativistic Au + Au collisions for various centralities and compare to data recently collected at the Relativistic Heavy Ion Collider by the PHENIX Collaboration. Our results for photons from primary hard scatterings and photons from interactions of jets with the medium are consistent with the measurements of neutral pion and direct photon production in p+p collisions and give a good description of direct photon spectra measured in Au + Au collisions. The contribution of photons from jet-to-photon conversion in the medium can be as large as the photon yield from hard scatterings in the momentum range p_T\ensuremath≈2--6 GeV/c. We show that this novel mechanism is not ruled out by any existing data.

Citations

• Flash of photons from the early stage of heavy-ion collisions
• Jets and produced particles inppcollisions from SPS to RHIC energies for nuclear applications
• Photon emission from quark-gluon plasma: complete leading order results
• Intensity interferometry of thermal photons from relativistic heavy-ion collisions
• The electromagnetic signature of jets
• Fragmentation functions for pions, kaons, and protons at next-to-leading order
• Thermal photon production rate from nonequilibrium quantum field theory
• Absence of Suppression in Particle Production at Large Transverse Momentum insNN=200 GeVd+AuCollisions
• Midrapidity Neutral-Pion Production in Proton-Proton Collisions ats=200 GeV
• Suppressedπ0Production at Large Transverse Momentum in CentralAu+AuCollisions atsNN=200 GeV

Cited by

• Photon production and elliptic flow from a momentum-anisotropic quark-gluon plasma
• Photon and dilepton production in high-energy heavy-ion collisions
• Systematic study of high-pTdirect photon production with the PHENIX experiment at RHIC