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Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates

D Boyanovsky, H. de Vega, R Holman, Prem Kumar Orcid Logo

Physical Review D, Volume: 56, Issue: 7, Pages: 3929 - 3942

Swansea University Author: Prem Kumar Orcid Logo

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DOI (Published version): 10.1103/PhysRevD.56.3929

Abstract

We study production of photons via the non-equilibrium relaxation of a Disoriented Chiral Condensate with the chiral order parameter having a large initial amplitude along the π0 direction. Assuming the validity of the low energy coupling of the neutral pion to photons via the UA(1) anomalous ver- t...

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Published in: Physical Review D
Published: 1997
URI: https://cronfa.swan.ac.uk/Record/cronfa16118
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first_indexed 2013-09-26T11:46:04Z
last_indexed 2020-07-16T18:28:33Z
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spelling 2020-07-16T14:43:48.3418666 v2 16118 2013-09-20 Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates 087fd097167d724ce1b13cb285741ef5 0000-0003-0867-4213 Prem Kumar Prem Kumar true false 2013-09-20 SPH We study production of photons via the non-equilibrium relaxation of a Disoriented Chiral Condensate with the chiral order parameter having a large initial amplitude along the π0 direction. Assuming the validity of the low energy coupling of the neutral pion to photons via the UA(1) anomalous ver- tex, we find that for large initial amplitudes along the π0 direction, photon production is enhanced by parametric amplification. These processes are non- perturbative with a large contribution during the non-equilibrium stages of the evolution and result in a distinct distribution of the produced photons and a polarization asymmetry. For initial amplitudes of the π0 component of the order parameter between 200-400 MeV, corresponding to energy densities between 1-12 GeV/fm3 we find a peak in the photon distribution at energies between ≈ 300−600 MeV. We also find polarization asymmetries typically between 5 − 10%. We discuss the potential experimental impact of these results as well as the problems associated with its detection. Journal Article Physical Review D 56 7 3929 3942 31 12 1997 1997-12-31 10.1103/PhysRevD.56.3929 COLLEGE NANME Physics COLLEGE CODE SPH Swansea University 2020-07-16T14:43:48.3418666 2013-09-20T10:50:48.4576887 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics D Boyanovsky 1 H. de Vega 2 R Holman 3 Prem Kumar 0000-0003-0867-4213 4
title Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
spellingShingle Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
Prem Kumar
title_short Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
title_full Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
title_fullStr Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
title_full_unstemmed Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
title_sort Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
author_id_str_mv 087fd097167d724ce1b13cb285741ef5
author_id_fullname_str_mv 087fd097167d724ce1b13cb285741ef5_***_Prem Kumar
author Prem Kumar
author2 D Boyanovsky
H. de Vega
R Holman
Prem Kumar
format Journal article
container_title Physical Review D
container_volume 56
container_issue 7
container_start_page 3929
publishDate 1997
institution Swansea University
doi_str_mv 10.1103/PhysRevD.56.3929
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description We study production of photons via the non-equilibrium relaxation of a Disoriented Chiral Condensate with the chiral order parameter having a large initial amplitude along the π0 direction. Assuming the validity of the low energy coupling of the neutral pion to photons via the UA(1) anomalous ver- tex, we find that for large initial amplitudes along the π0 direction, photon production is enhanced by parametric amplification. These processes are non- perturbative with a large contribution during the non-equilibrium stages of the evolution and result in a distinct distribution of the produced photons and a polarization asymmetry. For initial amplitudes of the π0 component of the order parameter between 200-400 MeV, corresponding to energy densities between 1-12 GeV/fm3 we find a peak in the photon distribution at energies between ≈ 300−600 MeV. We also find polarization asymmetries typically between 5 − 10%. We discuss the potential experimental impact of these results as well as the problems associated with its detection.
published_date 1997-12-31T03:18:24Z
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score 11.016235

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