Low-Energy Theorem forγ→3πand a Unitarity Bound on the Decay Rate forK→πγγ

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1 November 1973

journal article
research article
Published by American Physical Society (APS) in Physical Review D

Vol. 8 (9) , 3056-3063
https://doi.org/10.1103/physrevd.8.3056

Abstract

Using the model-independent amplitude for

π π \to π γ γ

predicted by the theory of anomalies, we derive unitarity bounds for the branching ratios

\frac{Γ (K^{+} \to π^{+} 2 γ)}{Γ (K^{+} \to π^{+} π^{0})}

and

\frac{Γ (K_{s}^{0} \to π^{0} 2 γ)}{Γ (K_{s}^{0} \to π^{+} π^{-})}

.

Keywords

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