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arXiv · hep-ph/9912513

Analysis of O(p^2) Corrections to

Vincenzo Cirigliano·Eugene Golowich
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Abstract

The one-loop corrections to K->pi and K->2pi matrix elements of the electroweak penguin operator are calculated. General next-to-leading order relations between the K->pi and K->2pi amplitudes are obtained. The fractional shift Delta_2 = 0.27 +- 0.27 is found for the O(p^2) corrections to a recent chiral determination of <(pi pi)_{I=2}|Q_{7,8}|K^0>. We explain why the sign for Delta_2 is opposite to that expected from unitarization approaches based on the Omnes equation. We perform a background-field, heat-kernel determination of the divergent one-loop amplitudes for a general class of (V-A)x(V+A) operators.

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Vincenzo Cirigliano, Eugene Golowich. 1999-12-27. Analysis of O(p^2) Corrections to. https://doi.org/10.1016/s0370-2693(00)00098-8

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