Search for B -> tau nu and B -> K nu nubar Decays with a Fully Reconstructed B at Belle

Details Search for B -> tau nu and B -> K nu nubar Decays with a Fully Reconstructed B at Belle Search for B -> tau nu and B -> K nu nubar Decays with a Fully Reconstructed B at Belle

2005-07-08

arxiv.org/abs/hep-ex/0507034v1

Physics

High Energy Physics

High Energy Physics - Experiment

12 pages, 6 figures, submitted to the Lepton Photon 2005 conference in Uppsala, Sweden and to the HEP2005 Europhysics Conferen

Scientific paper

We present a search for the decays B -> tau nu and B -> K nu nubar in a 253 fb^-1 data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy B factory. Combinatorial and continuum backgrounds are suppressed by selecting a sample of events with one fully reconstructed B. The decay products of the B on the other side of the event are analyzed to search for B -> tau nu and B -> K nu nubar decays. We find no significant evidence for a signal and set 90% confidence level upper limits of B(B -> tau nu) < 1.8*10^-4 and B(B -> K nu nubar) < 3.6*10^-5.

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