A search for the decay B+ -> K+ nu nubar

2004/08/17 by B. Aubert, BABAR Collaboration, Aubert, B. +1
Physics and Astronomy · #Bar (unit) #Detector #Electron #Hadron #High-Energy Particle Collisions Research #Lepton #Limit (mathematics) #Nuclear physics #Particle Detector Development and Performance #Particle identification #Particle physics #Particle physics theoretical and experimental studies #Physics #Semileptonic decay #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0408086

published in arXiv (Cornell University) (Cornell University) · 13 pages, 8 figures, submitted to ICHEP 04 (16-22 Aug, 2004, Beijing China)

arxiv created 2004/08/17 · openalex publication_date 2004/08/17 · arxiv updated 2016/04/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06

Abstract

We present a search for the rare flavor-changing neutral-current decay B⁺ → K⁺ νν based on data sample of 82 fb^-1 collected with the BABAR detector at the PEP-II B-factory. Signal events are selected by examining the properties of the system recoiling against either a reconstructed hadronic or semileptonic charged B decay. Using these two independent samples, a combined limit of \mathcal B(B⁺ → K⁺ νν)<5.2 × 10^-5 is obtained at the 90% confidence level. In addition, by modifying the particle identification criteria, a limit of \mathcal B (B⁺→π⁺νν)<1.0 × 10^-4 is obtained using hadronic B reconstruction. All results are preliminary.

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