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Title: Photon emission from a momentum-anisotropic quark-gluon plasma

Abstract

Here, we compute the photon emission rate from a quark-gluon plasma with an anisotropic particle momentum distribution induced by a non-vanishing local shear pressure tensor. Our calculation includes photon production through Compton scattering and quark-antiquark annihilation at leading order in αs , with all off-equilibrium corrections to leading order in the momentum anisotropy. For fermions we prove that the Kubo-Martin-Schwinger relation holds in the hard loop regime for any particle momentum distribution function that is reflection symmetric. This supports the equivalence, for 2-to-2 scattering processes, of the diagrammatic and kinetic approaches to calculating the photon emission rate. We compare the viscous rates from these two approaches at weak and realistic coupling strengths and provide parametrizations of the equilibrium and viscous photon emission rates for phenomenological studies in relativistic heavy-ion collisions.

Authors:
 [1];  [2]; ORCiD logo [3];  [4]
  1. McGill Univ., Montreal, QC (Canada); The Ohio State Univ., Columbus, OH (United States)
  2. McGill Univ., Montreal, QC (Canada)
  3. The Ohio State Univ., Columbus, OH (United States)
  4. Frankfurt Inst. for Advanced Studies (Germany)
Publication Date:
Research Org.:
The Ohio State Univ., Columbus, OH (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences and Engineering Research Council of Canada (NSERC); Hydro-Quebec; Fonds de Recherche du Quebec; Helmholtz International Center for FAIR (HIC for FAIR)
OSTI Identifier:
1604535
Alternate Identifier(s):
OSTI ID: 1181129
Grant/Contract Number:  
SC0004286; SC0004104
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C, Nuclear Physics
Additional Journal Information:
Journal Volume: 91; Journal Issue: 1; Journal ID: ISSN 0556-2813
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Shen, Chun, Paquet, Jean-François, Heinz, Ulrich, and Gale, Charles. Photon emission from a momentum-anisotropic quark-gluon plasma. United States: N. p., 2015. Web. doi:10.1103/PhysRevC.91.014908.
Shen, Chun, Paquet, Jean-François, Heinz, Ulrich, & Gale, Charles. Photon emission from a momentum-anisotropic quark-gluon plasma. United States. https://doi.org/10.1103/PhysRevC.91.014908
Shen, Chun, Paquet, Jean-François, Heinz, Ulrich, and Gale, Charles. Wed . "Photon emission from a momentum-anisotropic quark-gluon plasma". United States. https://doi.org/10.1103/PhysRevC.91.014908. https://www.osti.gov/servlets/purl/1604535.
@article{osti_1604535,
title = {Photon emission from a momentum-anisotropic quark-gluon plasma},
author = {Shen, Chun and Paquet, Jean-François and Heinz, Ulrich and Gale, Charles},
abstractNote = {Here, we compute the photon emission rate from a quark-gluon plasma with an anisotropic particle momentum distribution induced by a non-vanishing local shear pressure tensor. Our calculation includes photon production through Compton scattering and quark-antiquark annihilation at leading order in αs , with all off-equilibrium corrections to leading order in the momentum anisotropy. For fermions we prove that the Kubo-Martin-Schwinger relation holds in the hard loop regime for any particle momentum distribution function that is reflection symmetric. This supports the equivalence, for 2-to-2 scattering processes, of the diagrammatic and kinetic approaches to calculating the photon emission rate. We compare the viscous rates from these two approaches at weak and realistic coupling strengths and provide parametrizations of the equilibrium and viscous photon emission rates for phenomenological studies in relativistic heavy-ion collisions.},
doi = {10.1103/PhysRevC.91.014908},
journal = {Physical Review C, Nuclear Physics},
number = 1,
volume = 91,
place = {United States},
year = {Wed Jan 28 00:00:00 EST 2015},
month = {Wed Jan 28 00:00:00 EST 2015}
}

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Cited by: 38 works
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Works referencing / citing this record:

The production of photons in relativistic heavy-ion collisions
text, January 2015


Collectivity and electromagnetic radiation in small systems
text, January 2016