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.
@article{arxiv.hep-ph/0209332,
title = {K -> pi pi Electroweak Penguins in the Chiral Limit},
author = {V. Cirigliano and J. F. Donoghue and E. Golowich and K. Maltman},
journal= {arXiv preprint arXiv:hep-ph/0209332},
year = {2009}
}
Comments
4 pages, 2 figures. Contribution to QCD02, International Conference on Quantum Chromo-Dynamics, Montpellier (France), July 2-9 2002