Evidence of B[superscript +]→τ[superscript +]ν decays with hadronic B tags
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Lees_Evidence-of-B+.pdf
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Author(s)
Sciolla, Gabriella
Cowan, Ray F
Dujmic, Denis
Date Issued
August 2013
Journal
Physical Review D
Publisher
American Physical Society
Citation
Lees, J. P., V. Poireau, V. Tisserand, J. Garra Tico, E. Grauges, A. Palano, G. Eigen, et al. “Evidence of B^{+}→τ^{+}ν decays with hadronic B tags.” Physical Review D 88, no. 3 (August 2013). © 2013 American Physical Society
Version
Final published version
Abstract
We present a search for the decay B[superscript +]→τ[superscript +]ν using 467.8×10[superscript 6] BB̅ pairs collected at the Υ(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We select a sample of events with one completely reconstructed B[superscript -] in the hadronic decay mode (B[superscript -]→D[superscript (*)0]X[superscript -] and B[superscript -]→J/ψX[superscript -]). We examine the rest of the event to search for a B[superscript +]→τ[superscript +]ν decay. We identify the τ[superscript +] lepton in the following modes: τ[superscript +]→e[superscript +]νν̅ , τ[superscript +]→μ[superscript +]νν̅ , τ[superscript +]→π[superscript +]ν̅ and τ[superscript +]→ρ[superscript +]ν̅ . We find an excess of events with respect to the expected background, which excludes the null signal hypothesis at the level of 3.8σ (including systematic uncertainties) and corresponds to a branching fraction value of B(B[superscript +]→τ[superscript +]ν)=(1.83[+0.53 over -0.49](stat)±0.24(syst))×10[superscript -4].
MIT Department
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevD.88.031102
