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26 April 2024 |
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Energy Loss of Leading Hadrons and Direct Photon production in Evolving Quark-Gluon Plasma | | Simon Turbide
; Charles Gale
; Sangyong Jeon
; Guy D. Moore
; | | Date: |
28 Feb 2005 | | Journal: | Phys.Rev. C72 (2005) 014906 | | Subject: | hep-ph nucl-th | | Affiliation: | McGill University), Charles Gale (McGill University), Sangyong Jeon (McGill University, RIKEN-BNL Research Center) and Guy D. Moore (McGill University | | Abstract: | 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 au_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 | | Source: | arXiv, hep-ph/0502248 | | Services: | Forum | Review | PDF | Favorites | |
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