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Title: Centrality-dependent direct photon p{sub t} spectra in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV

Abstract

We calculate the centrality dependence of transverse momentum (p{sub t}) spectra for direct photons in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV, based on a realistic data-constrained (3+1)-dimensional hydrodynamic description of the expanding hot and dense matter, a reasonable treatment of the propagation of partons and their energy loss in the fluid, and a systematic study of the main sources of direct photons. The resultant p{sub t} spectra agree with recent PHENIX data in a broad p{sub t} range. The competition among the different direct photon sources is investigated at various centralities. Parton energy loss in the plasma is considered for photons from fragmentation and jet-photon conversion, which causes about 40% decrease in the total contribution. In the high p{sub t} region, the observed R{sub AA} of photons is centrality independent at the accuracy of 5% based on a realistic treatment of energy loss. We also link the different behavior of R{sub AA} for central and peripheral collisions, in the low p{sub t} region, to the fact that the plasma in central collisions is hotter than that in peripheral ones.

Authors:
;  [1];  [2];  [3]
  1. Institute of Particle Physics, Central China Normal University, Wuhan (China)
  2. Department of Physics, University of Tokyo, 113-0033 (Japan)
  3. Laboratoire SUBATECH, University of Nantes, IN2P3/CNRS, Ecole des Mines, Nantes (France)
Publication Date:
OSTI Identifier:
21202708
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 79; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.79.014905; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOM-ATOM COLLISIONS; BNL; BROOKHAVEN RHIC; CONVERSION; ENERGY LOSSES; FLUIDS; FRAGMENTATION; GEV RANGE 100-1000; GOLD; HYDRODYNAMIC MODEL; PERIPHERAL COLLISIONS; PHOTONS; PLASMA; SIMULATION; SPECTRA; THREE-DIMENSIONAL CALCULATIONS; TRANSVERSE MOMENTUM

Citation Formats

Fuming, Liu, Yan, Zhu, Hirano, Tetsufumi, and Werner, Klaus. Centrality-dependent direct photon p{sub t} spectra in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV. United States: N. p., 2009. Web. doi:10.1103/PHYSREVC.79.014905.
Fuming, Liu, Yan, Zhu, Hirano, Tetsufumi, & Werner, Klaus. Centrality-dependent direct photon p{sub t} spectra in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV. United States. https://doi.org/10.1103/PHYSREVC.79.014905
Fuming, Liu, Yan, Zhu, Hirano, Tetsufumi, and Werner, Klaus. Thu . "Centrality-dependent direct photon p{sub t} spectra in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV". United States. https://doi.org/10.1103/PHYSREVC.79.014905.
@article{osti_21202708,
title = {Centrality-dependent direct photon p{sub t} spectra in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV},
author = {Fuming, Liu and Yan, Zhu and Hirano, Tetsufumi and Werner, Klaus},
abstractNote = {We calculate the centrality dependence of transverse momentum (p{sub t}) spectra for direct photons in Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy {radical}(s{sub NN})=200 GeV, based on a realistic data-constrained (3+1)-dimensional hydrodynamic description of the expanding hot and dense matter, a reasonable treatment of the propagation of partons and their energy loss in the fluid, and a systematic study of the main sources of direct photons. The resultant p{sub t} spectra agree with recent PHENIX data in a broad p{sub t} range. The competition among the different direct photon sources is investigated at various centralities. Parton energy loss in the plasma is considered for photons from fragmentation and jet-photon conversion, which causes about 40% decrease in the total contribution. In the high p{sub t} region, the observed R{sub AA} of photons is centrality independent at the accuracy of 5% based on a realistic treatment of energy loss. We also link the different behavior of R{sub AA} for central and peripheral collisions, in the low p{sub t} region, to the fact that the plasma in central collisions is hotter than that in peripheral ones.},
doi = {10.1103/PHYSREVC.79.014905},
url = {https://www.osti.gov/biblio/21202708}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 79,
place = {United States},
year = {2009},
month = {1}
}