Using K0?? ? ?? transitions to compute K ?(? ?)I=0 decay amplitudes at NLO in the chiral expansion

Changhoan, Kim and Sachrajda, Christopher (2007) Using K0?? ? ?? transitions to compute K ?(? ?)I=0 decay amplitudes at NLO in the chiral expansion. Proceedings of Science, 1-7.

Abstract

It is proposed to compute matrix elements for the (unphysical) K0?? ? ?? transition to determine
the next-to-leading order low energy constants of the weak chiral Lagrangian. This allows
us to evaluate K ?(? ?)I=0 decay amplitudes at this level of precision. This approach has several
significant advantages over the use of K ?? transitions, most notably the elimination of
s-channel disconnected diagrams and the use of fewer inversions.

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