Work

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

Year: 2017

Type: article

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.

Source: Physical Review C

DOI: 10.1103/physrevc.95.054904

Authors: Jürgen Berges, Klaus Reygers, Naoto Tanji, Raju Venugopalan

Institutions: Heidelberg University, Institute for Theoretical Physics, Brookhaven National Laboratory

Language: English

Topic: High-Energy Particle Collisions Research

Subfield: Nuclear and High Energy Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: U.S. Department of Energy, Deutsche Forschungsgemeinschaft, Universität Heidelberg, Office of Under Secretary for Science

Awards: G1170463422, G241279073, G5765906131