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

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

2004-08-17

arxiv.org/abs/hep-ex/0408086v1

Physics

High Energy Physics

High Energy Physics - Experiment

13 pages, 8 figures, submitted to ICHEP 04 (16-22 Aug, 2004, Beijing China)

Scientific paper

We present a search for the rare flavor-changing neutral-current decay $B^+ \to K^+ \nu \bar{\nu}$ 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 ${\mathcal B}(B^+ \to K^+ \nu\bar{\nu})<5.2 \times 10^{-5}$ is obtained at the 90% confidence level. In addition, by modifying the particle identification criteria, a limit of ${\mathcal B} (B^+\to\pi^+\nu\bar{\nu})<1.0 \times 10^{-4}$ is obtained using hadronic $B$ reconstruction. All results are preliminary.

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