Journal article 1015 views
Nonequilibrium production of photons via π0→2γ in disoriented chiral condensates
D Boyanovsky,
H. de Vega,
R Holman,
Prem Kumar 
Physical Review D, Volume: 56, Issue: 7, Pages: 3929 - 3942
Swansea University Author:
Prem Kumar
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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...
| Published in: | Physical Review D |
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| Published: |
1997
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| URI: | https://cronfa.swan.ac.uk/Record/cronfa16118 |
| 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. |
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| College: |
Faculty of Science and Engineering |
| Issue: |
7 |
| Start Page: |
3929 |
| End Page: |
3942 |