We extend in several respects our earlier work on O(p2) corrections to the matrix elements of the electroweak penguin operator Oewp. First, to facilitate comparison with certain lattice studies we calculate O(p2) corrections to 〈π|Oewp|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 〈(ππ)I=2|Oewp|K〉 is simply a consequence of how the leading order chiral amplitude is defined. Finally, we address an aspect of the ε′/ε problem by estimating O(p2) corrections to recent determinations of 〈(ππ)I=2|Q7,8|K〉 which were carried out in the chiral limit.
Physics Review D