A search for B+ --> tau+ nu with Hadronic B tags
Abstract
We present a search for the decay B^+ --> tau^+ nu using 383 \times 10^{6}} BBbar pairs collected at the Upsilon(4S) resonance with the BABAR detector at the SLAC PEP-II B Factory. We select a sample of events with one completely reconstructed tag B in a hadronic decay mode (), and examine the rest of the event to search for a B^+ --> tau^+ nu decay. We identify the tau lepton in the following modes: tau^+ --> e^+ nu nu,tau^+ --> mu^+ nu nu, tau^+ --> pi^+ nu and tau^+ --> pi^+ pi^0 nu. We find a 2.2 sigma excess in data and measure a branching fraction of B(B+ --> tau^+ nu) = (1.8^{+0.9}_{-0.8}(stat.) \pm 0.4(bkg. syst.) \pm 0.2 (other syst.)) \times 10^{4}. We calculate the product of the B meson decay constant f_{B} and |V_{ub}| to be f_{B} |V_{ub}| = (10.1^{+2.3}_{-2.5}(stat.)^{+1.2}_{-1.5}(syst.))\times10^{-4} GeV
Keywords
Cite
@article{arxiv.0708.2260,
title = {A search for B+ --> tau+ nu with Hadronic B tags},
author = {The BABAR Collaboration and B. Aubert},
journal= {arXiv preprint arXiv:0708.2260},
year = {2010}
}
Comments
8 pages, 2 figures, submitted to Physics Review D - Rapid Communications