Abstract
We search for the rare flavor-changing neutral-current decay B+→K+νν¯ in a 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 we obtain a combined limit of B(B+→K+νν¯)<5.2×10−5 at the 90% confidence level. In addition, by selecting for pions rather than kaons, we obtain a limit of B(B+→π+νν¯)<1.0×10−4 using only the hadronic B reconstruction method.Received 17 November 2004DOI:https://doi.org/10.1103/PhysRevLett.94.101801©2005 American Physical Society
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