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Evidence of B+->tau nu decays with hadronic B tags

Abstract : We present a search for the decay B+ -->tau+ nu using 467.8 x 10^6 B B pairs collected at the Y(4S) resonance with the BaBar detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B- in the hadronic decay modes (B- --> D(*)0 X- and B- --> J/\psi X-). We 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+ --> rho+ nu. We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8 sigma (including systematic uncertainties) and corresponds to a branching fraction central value of B(B+ --> tau+ nu)=(1.83^{+0.53}_{-0.49}(stat.) +/- 0.24 (syst.)) x 10^-4.
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Contributor : Sabine Starita <>
Submitted on : Thursday, September 12, 2013 - 1:37:54 PM
Last modification on : Saturday, November 28, 2020 - 12:58:03 PM

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J. P. Lees, V. Poireau, V. Tisserand, N. Arnaud, M. Davier, et al.. Evidence of B+->tau nu decays with hadronic B tags. Physical Review D, American Physical Society, 2013, 88, pp.031102. ⟨10.1103/PhysRevD.88.031102⟩. ⟨in2p3-00861265⟩



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