K_{L,S} \to ππν\barν Decays Within and Beyond the Standard Model

Details K_{L,S} \to ππν\barν Decays Within and Beyond the Standard Model K_{L,S} \to ππν\barν Decays Within and Beyond the Standard Model

2000-07-07

arxiv.org/abs/hep-ph/0007063v1

Phys.Rev. D62 (2000) 094026

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages and no figure

Scientific paper

10.1103/PhysRevD.62.094026

The decays K_{L,S} -> \pi^o \pi^o \nu \bar{\nu} and K_{L,S} -> \pi^+ \pi^- \nu \bar{\nu} involve the weak transition from a strange to a non-strange quark. Although they have considerably smaller branching ratios than those for the corresponding rare processes involving single pions, some may be more distinguishable experimentally from background processes and thus could provide another probe of the s -> d \nu \bar{\nu} transition. Using recent knowledge of the CKM matrix elements and measurements of related processes, we give improved predictions for their branching ratios both within and beyond the Standard Model.

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