2012/12/21 by Dana M. Lindemann, Lindemann, Dana M.
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.1212.5578
Proceedings of CKM 2012, the 7th International Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28 September -- 2 October 2012
arxiv created 2012/12/21 · openalex publication_date 2012/12/21 · arxiv updated 2012/12/24 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 106 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.