K -> pi pi Electroweak Penguins in the Chiral Limit

Abstract

We report on dispersive and finite energy sum rule analyses of the electroweak penguin matrix elements < (pi pi) | Q_{7,8} | K > in the chiral limit. We accomplish the correct perturbative matching (scale and scheme dependence) at NLO in alpha_s, and we describe two different strategies for numerical evaluation.

Comments: 4 pages, 2 figures. Contribution to QCD02, International Conference on Quantum Chromo-Dynamics, Montpellier (France), July 2-9 2002