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

Jürgen Berges, Klaus Reygers, Naoto Tanji, and Raju Venugopalan
Phys. Rev. C 95, 054904 – Published 9 May 2017

Abstract

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. 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. 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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  • Received 6 February 2017

DOI:https://doi.org/10.1103/PhysRevC.95.054904

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Jürgen Berges

  • Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany

Klaus Reygers

  • Physikalisches Institut, Im Neuenheimer Feld 226, 69120 Heidelberg, Germany

Naoto Tanji*

  • Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 12, 69120 Heidelberg, Germany

Raju Venugopalan

  • Physics Department, Brookhaven National Laboratory, Building 510A, Upton, New York 11973, USA

  • *tanji@thphys.uni-heidelberg.de

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Issue

Vol. 95, Iss. 5 — May 2017

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