Chiral expansion of the $π^0\rightarrowγγ$ decay width

preprint2011arXivOpen access

A chiral field theory of mesons has been applied to study the contribution of the current quark masses to the $π^0\rightarrowγγ$ decay width at the next leading order. $2\%$ enhancement has been predicted and there is no new parameter.

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Chiral expansion of the $π^0\rightarrowγγ$ decay width

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Chiral expansion of the π0→γγπ^0\rightarrowγγπ0→γγ decay width

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Chiral expansion of the $π^0\rightarrowγγ$ decay width