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Title: Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma

Abstract

We calculate the nuclear modification factor of neutral pions and the photon yield at high p{sub T} in central Au-Au collisions at the Relativistic Heavy-Ion Collider (RHIC) ({radical}(s)=200 GeV) and Pb-Pb collisions at the Large Hadron Collider (LHC) ({radical}(s)=5500 GeV). A leading-order accurate treatment of jet energy loss in the medium has been convolved with a physical description of the initial spatial distribution of jets and a one dimensional hydrodynamic expansion. We reproduce the nuclear modification factor for pions R{sub AA} at RHIC, assuming an initial temperature T{sub i}=370 MeV and a formation time {tau}{sub i}=0.26 fm/c, corresponding to dN/dy=1260. The resulting suppression depends on the particle rapidity density dN/dy but weakly on the initial temperature. The jet energy loss treatment is also included in the calculation of high p{sub T} photons. Photons coming from primordial hard N-N scattering are the dominant contribution at RHIC for p{sub T}>5 GeV, whereas at the LHC, the range 8<p{sub T}<14 GeV is dominated by jet-photon conversion in the plasma.

Authors:
; ;  [1];  [1]
  1. Department of Physics, McGill Univer-sity, 3600 University Street, Montreal, H3A 2T8 (Canada)
Publication Date:
OSTI Identifier:
20698849
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 72; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.72.014906; (c) 2005 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; BROOKHAVEN RHIC; CERN LHC; ENERGY LOSSES; GEV RANGE; GLUONS; GOLD 197 REACTIONS; GOLD 197 TARGET; JET MODEL; MEV RANGE; NUCLEAR REACTION YIELD; PARTICLE PRODUCTION; PARTICLE RAPIDITY; PHOTONS; PIONS NEUTRAL; QUANTUM CHROMODYNAMICS; QUARK MATTER; SPATIAL DISTRIBUTION

Citation Formats

Turbide, Simon, Gale, Charles, Moore, Guy D, Jeon, Sangyong, and RIKEN-BNL Research Center, Upton, New York 11973-5000. Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.014906.
Turbide, Simon, Gale, Charles, Moore, Guy D, Jeon, Sangyong, & RIKEN-BNL Research Center, Upton, New York 11973-5000. Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma. United States. https://doi.org/10.1103/PhysRevC.72.014906
Turbide, Simon, Gale, Charles, Moore, Guy D, Jeon, Sangyong, and RIKEN-BNL Research Center, Upton, New York 11973-5000. Fri . "Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma". United States. https://doi.org/10.1103/PhysRevC.72.014906.
@article{osti_20698849,
title = {Energy loss of leading hadrons and direct photon production in evolving quark-gluon plasma},
author = {Turbide, Simon and Gale, Charles and Moore, Guy D and Jeon, Sangyong and RIKEN-BNL Research Center, Upton, New York 11973-5000},
abstractNote = {We calculate the nuclear modification factor of neutral pions and the photon yield at high p{sub T} in central Au-Au collisions at the Relativistic Heavy-Ion Collider (RHIC) ({radical}(s)=200 GeV) and Pb-Pb collisions at the Large Hadron Collider (LHC) ({radical}(s)=5500 GeV). A leading-order accurate treatment of jet energy loss in the medium has been convolved with a physical description of the initial spatial distribution of jets and a one dimensional hydrodynamic expansion. We reproduce the nuclear modification factor for pions R{sub AA} at RHIC, assuming an initial temperature T{sub i}=370 MeV and a formation time {tau}{sub i}=0.26 fm/c, corresponding to dN/dy=1260. The resulting suppression depends on the particle rapidity density dN/dy but weakly on the initial temperature. The jet energy loss treatment is also included in the calculation of high p{sub T} photons. Photons coming from primordial hard N-N scattering are the dominant contribution at RHIC for p{sub T}>5 GeV, whereas at the LHC, the range 8<p{sub T}<14 GeV is dominated by jet-photon conversion in the plasma.},
doi = {10.1103/PhysRevC.72.014906},
url = {https://www.osti.gov/biblio/20698849}, journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 1,
volume = 72,
place = {United States},
year = {2005},
month = {7}
}