pi_0 --> gamma gamma and the axial anomaly at non zero temperature

Details pi_0 --> gamma gamma and the axial anomaly at non zero temperature pi_0 --> gamma gamma and the axial anomaly at non zero temperature

1997-05-14

arxiv.org/abs/hep-ph/9705316v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, latex, 2 figs using epsfig. Contribution to the 31st Rencontres de Moriond, "QCD and High Energy Hadronic Interaction

Scientific paper

In vacuum, in the chiral limit the coupling of a pion to two on-shell photons
is directly related to the coefficient of the axial anomaly in QED. This
relationship is lost at any nonzero temperature. Explicit calculations show
that the coupling decreases with temperature and vanishes at Tc, the
temperature of chiral symmetry restoration.

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