arXiv:hep-ph/0212321·v4·High Energy Physics — Phenomenology
Estimate of B(K -> pi nu nubar) from Standard Model fits to lambda_t
S. H. Kettell (1)🇺🇸 · L. G. Landsberg (2)🇷🇺 · H. Nguyen (3) ((1) Brookhaven National Lab, NY, USA, (2) Institute for High Energy Physics, Serpukhov, Russia, (3) Fermilab, IL, USA)🇺🇸
Abstract
We estimate B(K -> pi nu nubar) in the context of the Standard Model by fitting for lambda_t = Vtd x V*ts of the `kaon unitarity triangle' relation. We fit data from epsilon_K, the CP-violating parameter describing K-mixing, and a_{psi K}, the CP-violating asymmetry in B -> J/psi K decays. Our estimate is independent of the CKM matrix element Vcb and of the ratio of Bs to Bd mixing frequencies. The measured value of B(K+ -> pi+ nu nubar) can be compared both to this estimate and to predictions made from the ratio of B mixing frequencies.
Comments: 8 pages, including 6 figures. v3 includes an expanded discussion of correlations between SM inputs to the lambda_t fit, clarifies the discussion of the independence of this result from the ratio of B mixing frequencies, includes minor updates to the values of SM input parameters, and includes some new and some updated references