Search for the B+ -> K+vv Decay Using Semi-Leptonic Tags

2009/11/10 by The BABAR Collaboration, B. Aubert, Aubert, B.
Engineering · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Neutrino Physics Research #Particle accelerators and beam dynamics #Particle physics theoretical and experimental studies #hep-ex

paper · pdf · doi:10.48550/arxiv.0911.1988

11 pages, 6 figures, submitted to Phys. Rev. D

openalex publication_date 2009/11/10 · arxiv created 2009/11/12 · arxiv updated 2009/12/01 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We present an update of the search for the flavor-changing neutral current B+ -> K+vv decay using 351 x 10⁶ BB pairs collected at the Y(4S) resonance with the BABAR detector at the SLAC PEP-II B factory. Due to the presence of two neutrinos in the final state, we require the reconstruction of the companion B in the event through the decay channel B- -> D0l-v. We find 38 candidates in the data with an expected background of 31 +/- 12. This allows us to set an upper limit on the branching fraction for B+ -> K+vv of 4.5 x 10^-5 at 90% confidence level.

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