Analysis of O(p2) corrections to 〈ππ|Q7,8|K〉
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The one-loop corrections to K→π and K→2π matrix elements of the electroweak penguin operator are calculated. General next-to-leading order relations between the K→π and K→2π amplitudes are obtained. The fractional shift Δ2=0.27±0.27 is found for the Image corrections to a recent chiral determination of Image . We explain why the sign for Δ2 is opposite to that expected from unitarization approaches based on the Omnès equation. We perform a background-field, heat-kernel determination of the divergent one-loop amplitudes for a general class of (V−A)×(V+A) operators.
V Cirigliano and E Golowich. "Analysis of O(p2) corrections to 〈ππ|Q7,8|K〉" Physics Department Faculty Publication Series 475.3-4 (2000).
Available at: http://works.bepress.com/eugene_golowich/39