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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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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- 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.
College: Faculty of Science and Engineering
Issue: 7
Start Page: 3929
End Page: 3942

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