A search for the decay $B^+ \to K^+ ν\barν$

Details A search for the decay $B^+ \to K^+ ν\barν$ A search for the decay $B^+ \to K^+ ν\barν$

2004-11-18

arxiv.org/abs/hep-ex/0411061v1

Phys.Rev.Lett.94:101801,2005

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 8 postscript figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.94.101801

We search for the rare flavor-changing neutral-current decay $B^+ \to K^+ \nu \bar{\nu}$ in a data sample of 82 fb$^{-1}$ collected with the {\sl 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 we obtain a combined limit of ${\mathcal B}(B^+ \to K^+ \nu \bar{\nu})<5.2 \times 10^{-5}$ at the 90% confidence level. In addition, by selecting for pions rather than kaons, we obtain a limit of ${\mathcal B}(B^+ \to \pi^+ \nu \bar{\nu})<1.0 \times 10^{-4}$ using only the hadronic B reconstruction method.

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