The corrections induced by light quark masses for the pi0 lifetime arereexamined. We consider NNLO corrections and we compute all the one-loop and the two-loop diagrams at this order in the chiral expansion.
The corrections induced by light quark masses for the pi0 lifetime arereexamined. We consider NNLO corrections and we compute all the one-loop and the two-loop diagrams at this order in the chiral expansion. (en)