Extension of “Analysis ofO(p2)corrections to〈ππ|Q7,8|K〉”

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Abstract
We extend in several respects our earlier work on O(p(2)) corrections to the matrix elements of the electroweak penguin operator O-ewp. First, to facilitate comparison with certain lattice studies we calculate O(p(2)) corrections to [pi\O-ewp\K] in the SU(3) limit of equal light quark masses. Next, we demonstrate how an apparent disagreement in the literature regarding whether higher order chiral contributions increase or decrease [(pipi)(I=2)\O-ewp\K] is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the epsilon'/epsilon problem by estimating O(p(2)) corrections to recent determinations of [(pi)(I=2)\Q(7,8)\K] which were carried out in the chiral limit.
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