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

Journal Article · · Physical Review C
 [1];  [2];  [1];  [3]
  1. Heidelberg Univ. (Germany)
  2. Heidelberg Univ. (Germany). Inst. of Physics
  3. Brookhaven National Lab. (BNL), Upton, NY (United States)

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.

Research Organization:
Heidelberg Univ. (Germany); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE; German Research Foundation (DFG) (Germany)
Grant/Contract Number:
SC0012704
OSTI ID:
1392299
Report Number(s):
BNL--114275-2017-JA; KB0301020
Journal Information:
Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 95; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (11)

Effect of pre-equilibrium phase on R AA and v 2 of heavy quarks in heavy ion collisions journal August 2017
Entropy production in p p and Pb-Pb collisions at energies available at the CERN Large Hadron Collider journal December 2019
Prompt photon yield and elliptic flow from gluon fusion induced by magnetic fields in relativistic heavy-ion collisions journal July 2017
Worldline construction of a covariant chiral kinetic theory journal July 2017
Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions journal July 2019
Hydrodynamic Attractors, Initial State Energy, and Particle Production in Relativistic Nuclear Collisions journal December 2019
Effect of pre-equilibrium phase on $R_{AA}$ and $v_2$ of heavy quarks in heavy ion collisions text January 2017
World-line construction of a covariant chiral kinetic theory text January 2017
Beam-energy and centrality dependence of direct-photon emission from ultra-relativistic heavy-ion collisions text January 2018
Entropy production in pp and Pb-Pb collisions at energies available at the CERN Large Hadron Collider text January 2019
Hydrodynamic attractors, initial state energy and particle production in relativistic nuclear collisions text January 2019

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