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In a constituent quark model at nonzero temperature, the amplitude for $\pi^0\rightarrow 2 \gamma$ vanishes in a chirally symmetric phase, while that for$\pi^0 \sigma \rightarrow 2 \gamma$ does not.Comment: 7 pages, LaTeX. To appear in: "From thermal field theory to neural  networks, a day to remember Tanguy Altherr", World Scientific Publishin

IN A HOT, CHIRALLY SYMMETRIC PHASE, π0 DOESN'T GO INTO 2γ, BUT π0σ DOES

IN A HOT, CHIRALLY SYMMETRIC PHASE, π⁰ DOESN'T GO INTO 2γ, BUT π⁰σ DOES