Anomalous mesonic interactions near a chiral phase transition

Abstract

Using constituent quarks coupled to a linear sigma model at nonzero temperature, I show that many anomalous mesonic amplitudes, such as ${\pi }^0\to \gamma \gamma$, vanish in a chirally symmetric phase. Processes which are allowed, such as ${\pi }^0\sigma \to \gamma \gamma$, are computed to leading order in a loop expansion.

Comments: 4 pages, REVTeX, submitted to Phys. Rev. Lett