Search for the Rare Decay B->K nu nubar

Details Search for the Rare Decay B->K nu nubar Search for the Rare Decay B->K nu nubar

2010-09-08

arxiv.org/abs/1009.1529v2

Phys.Rev.D82:112002,2010

Physics

High Energy Physics

High Energy Physics - Experiment

10 pages, 6 postscript figures

Scientific paper

10.1103/PhysRevD.82.112002

We present a search for the rare decays B+ -> K+ nu nubar and B0 -> K0 nu nubar using 459 million BBbar pairs collected with the BaBar detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the Standard Model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B -> D(*) l nu of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level of 1.3 x 10^{-5} on the total branching fraction for B+ -> K+ nu nubar, and 5.6 x 10^{-5} for B0 -> K0 nu nubar. We additionally report partial branching fractions in two ranges of di-neutrino mass squared for B+ -> K+ nu nubar.

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