A Search for B+ -> tau+ nu

Abstract

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.

13 pages, 12 postscript figures, submitted to Physical Review D

References in corpus (9)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• The BABAR Detector
• Hints of large tan(beta) in flavour physics
• Evidence of the Purely Leptonic Decay B- --> tau- nu_tau-bar
• The B Meson Decay Constant from Unquenched Lattice QCD
• Study of Inclusive Production of Charmonium Mesons in B Decay
• Effect of H^\pm on B^\pm\to τ^\pmν_τand D^\pm_s\to μ^\pmν_μ,τ^\pmν_τ
• Including gaussian uncertainty on the background estimate for upper limit calculations using Poissonian sampling

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• SUSY GUTs with Yukawa unification: a go/no-go study using FCNC processes
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• Direct CP violation of $B\to l\nu$ in unparticle physics
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