Journal or Book Title
PHYSICS LETTERS B
We reconsider the dispersive evaluation of the weak matrix elements h()I=2|Q7,8|K0i in the chiral limit. The perturbative matching is accomplished fully within the scheme dependence used in the two loop weak OPE calculations. The effects of dimension eight (and higher dimension) operators are fully accounted for. We perform a numerical determination of the weak matrix elements using our dispersive sum rules fortified by constraints from the classical chiral sum rules. A careful assessment of the attendant uncertainties is given.
Cirigliano, V; Donoghue, JF; Golowich, Eugene; and Maltman, K, "Determination of <(pi pi)I=2/ohm 7,8/K0 > in the chiral limit" (2001). PHYSICS LETTERS B. 111.