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

Berges, Jürgen; Reygers, Klaus; Tanji, Naoto; Venugopalan, Raju

doi:10.1103/PhysRevC.95.054904

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

Journal Article · Tue May 09 04:00:00 UTC 2017 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.95.054904 · OSTI ID:1392299

Berges, Jürgen ^[1]; Reygers, Klaus ^[2]; Tanji, Naoto ^[1]; Venugopalan, Raju ^[3]

Heidelberg Univ. (Germany)
Heidelberg Univ. (Germany). Inst. of Physics
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.

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

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