B+ --> tau nu and B --> K(*) nu nubar at BaBar and SuperB
Abstract
We present the recent BaBar searches for the leptonic decay B+ --> tau+ nu and for the rare decay B --> K(*) nu nubar, using a data sample of about 470 x 10^6 BB pairs. Both searches use a technique in which one B meson is hadronically reconstructed before searching for evidence of the signal decay in the rest of the event. BaBar measures B(B+ --> tau+ nu) = (1.83 ^{+0.53}_{-0.49} +/- 0.24) x 10^{-4}, and preliminary upper limits at 90% confidence level of B(B --> K nu nubar) < 3.2 x 10^{-5} and B(B --> K* nu nubar) < 7.9 x 10^{-5}. We also discuss the expected observations and precision improvements related to B --> l+ nu and B --> K(*) nu nubar due to the higher luminosity of next generation B Factories like SuperB.
Cite
@article{arxiv.1212.5578,
title = {B+ --> tau nu and B --> K(*) nu nubar at BaBar and SuperB},
author = {Dana M. Lindemann},
journal= {arXiv preprint arXiv:1212.5578},
year = {2012}
}
Comments
Proceedings of CKM 2012, the 7th International Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28 September -- 2 October 2012