Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit

Details Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit

2001-09-13

arxiv.org/abs/hep-ph/0109113v1

Phys.Lett. B522 (2001) 245-256

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 2 figures

Scientific paper

10.1016/S0370-2693(01)01250-3

We reconsider the dispersive evaluation of the weak matrix elements <2pi_{I=2}|Q_{7,8}|K0> 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.

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