Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-02-28
Phys.Rev.C72:014906,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 16 figures. Discussions and references added. New figure includind photon data
Scientific paper
10.1103/PhysRevC.72.014906
We calculate the nuclear modification factor of neutral pions and the photon yield at high p_T in central Au-Au collisions at RHIC (\sqrt{s}=200 GeV) and Pb-Pb collisions at the LHC (\sqrt{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 (1+1) dimensional expansion. We reproduce the nuclear modification factor of pion R_{AA} at RHIC, assuming an initial temperature T_i=370 MeV and a formation time \tau_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_T photons. Photons coming from primordial hard N-N scattering are the dominant contribution at RHIC for p_T > 5 GeV, while at the LHC, the range 8
Gale Charles
Jeon Sangyong
Moore Guy D.
Turbide Simon
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