Light-quark Loops in K->pi nu nu

Details Light-quark Loops in K->pi nu nu Light-quark Loops in K->pi nu nu

2005-03-11

arxiv.org/abs/hep-ph/0503107v1

Nucl.Phys. B718 (2005) 319-338

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1016/j.nuclphysb.2005.04.008

We present a comprehensive analysis of the contributions to K->pi nu nu decays not described by the leading dimension-six effective Hamiltonian. These include both dimension-eight four-fermion operators generated at the charm scale, and genuine long-distance contributions which can be described within the framework of chiral perturbation theory. We show that a consistent treatment of the latter contributions, which turn out to be the dominant effect, requires the introduction of new chiral operators already at O(GF^2 p^2). Using this new chiral Lagrangian, we analyze the long-distance structure of K->pi nu nu amplitudes at the one-loop level, and discuss the role of the dimension-eight operators in the matching between short- and long-distance components. From the numerical point of view, we find that these O(GF^2 LambdaQCD^2) corrections enhance the SM prediction of Br(K+->pi+ nu nu) by about 6%

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