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Title: Parametric estimate of the relative photon yields from the glasma and the quark-gluon plasma in heavy-ion collisions

Recent classical-statistical numerical simulations have established the “bottom-up” thermalization scenario of Baier et al. [Phys. Lett. B 502, 51 (2001)] as the correct weak coupling effective theory for thermalization in ultrarelativistic heavy-ion collisions. In this paper, we perform a parametric study of photon production in the various stages of this bottom-up framework to ascertain the relative contribution of the off-equilibrium “glasma” relative to that of a thermalized quark-gluon plasma. Taking into account the constraints imposed by the measured charged hadron multiplicities at Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC), we find that glasma contributions are important especially for large values of the saturation scale at both energies. Finally, these nonequilibrium effects should therefore be taken into account in studies where weak coupling methods are employed to compute photon yields.
 [1] ;  [2] ;  [1] ;  [3]
  1. Heidelberg Univ. (Germany)
  2. Heidelberg Univ. (Germany). Inst. of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 2469-9985; R&D Project: KB0301020; KB0301020
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 95; Journal Issue: 5; Journal ID: ISSN 2469-9985
American Physical Society (APS)
Research Org:
Heidelberg Univ. (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE; German Research Foundation (DFG)
Country of Publication:
United States
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; photon, lepton and quark production; quark-gluon plasma; relativistic heavy-ion collisions
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1356274