We present a search for the decay B+ -> tau+ nu using 383x10^6 BBbar pairs collected at the Y(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B- -> D0 l nu X)) is selected, and in the recoil a search for B+ -> tau+ nu is performed. The tau is identified in the following channels: tau+ -> e nu nubar, tau+ -> mu nu nubar, tau+ -> pi+ nu, and tau+ -> pi+ pi0 nu. We measure a branching fraction of B(B+ -> tau+ nu)=(0.9 +- 0.6(stat.) +- 0.1(syst.)) x 10^-4. In the absence of a significant signal, we calculate an upper limit at the 90% confidence level of B(B+ -> tau+ nu) < 1.7 x 10^-4. We calculate the product of the B meson decay constant f_B and |V_ub| to be f_B x |V_ub| = (7.2^{+2.0}_{-2.8}(stat.) +- 0.2 (syst.)) x 10^-4 GeV.
Titolo: | A Search for B+ -> tau+ nu |
Autori: | |
Parole Chiave: | B semileptonic decays |
Settore Scientifico Disciplinare: | Settore FIS/01 - Fisica Sperimentale |
Data di pubblicazione: | 2007 |
Rivista: | |
URL: | http://link.aps.org/abstract/PRD/v76/e052002 |
Tipologia: | Article (author) |
Digital Object Identifier (DOI): | 10.1103/PhysRevD.76.052002 |
Appare nelle tipologie: | 01 - Articolo su periodico |