K -> pi nu nubar from standard to new physics

Abstract

Flavour changing neutral current decays are a very sensitive test of the standard model and its extensions. In particular the decay K -> pi nu nubar constitutes a clean way to provide constraints, independent of long distance effects. Motivated by the recent experimental data of the E787 and E865 collaborations and by the difference between the standard model prediction and data, we consider in detail new physics scenarios such as the minimal supersymmetric standard model and R-parity violating supersymmetry. We begin with analysing the impact of new measurements on the standard model result obtaining B(K^+ -> pi^+ nu nubar)=(8.18 +/- 1.22) x 10^(-11). Predictions for other rare kaon decays are discussed, too. Our results allow to improve the limits on R-parity violating couplings with respect to previous analyses.

17 pages, 2 figures, 1 table, LaTeX, JHEP style, references and 1 figure updated, minor changes in the text

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• Improved Measurement of the K+ to pi+ nu nubar Branching Ratio
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Cited by in corpus (14)

• R-parity violating supersymmetry
• Flavour physics of leptons and dipole moments
• Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c
• Flavor Physics in the Quark Sector
• B, D and K decays
• KL to pi0 e+ e- and KL to pi0 mu+ mu- : A binary star on the stage of flavor physics
• Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu
• The New Physics Reach of Null Tests with $D\to \pi \ell \ell$ and $D_s\to K\ell \ell$ Decays
• Linear programming analysis of the $R$-parity violation within EDM-constraints
• The s ---> d gamma decay in and beyond the Standard Model
• Decays $D_{(s)}^{+}\to \pi (K{)}^{+}{\ell }^{+}{\ell }^{-}$ and $D^0\to {\ell }^{+}{\ell }^{-}$ in the MSSM with and without R-parity
• Lifetime difference in D^0 - \bar{D^0} mixing within R-parity-violating SUSY
• SUSY R-parity violating contributions to the width differences for $D-\bar{D}$ and $B_{d,s}-{\bar{B}}_{d,s}$ systems
• Theory review on rare K decays: Standard Model and beyond