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Evidence of B^{+}→τ^{+}ν decays with hadronic B tags
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BaBar Collaboration (Including: Gershon, T. J., Harrison, P. F., Latham, Thomas and Puccio, E. M. T.). (2013) Evidence of B^{+}→τ^{+}ν decays with hadronic B tags. Physical Review D (Particles, Fields, Gravitation and Cosmology), 88 (3). 031102(R). doi:10.1103/PhysRevD.88.031102 ISSN 1550-7998.
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Official URL: http://dx.doi.org/10.1103/PhysRevD.88.031102
Abstract
We present a search for the decay B+→τ+ν using 467.8×106 BB¯¯¯ 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− in the hadronic decay mode (B−→D(*)0X− and B−→J/ψX−). We examine the rest of the event to search for a B+→τ+ν decay. We identify the τ+ lepton in the following modes: τ+→e+νν¯¯, τ+→μ+νν¯¯, τ+→π+ν¯¯ and τ+→ρ+ν¯¯. 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+→τ+ν)=(1.83+0.53−0.49(stat)±0.24(syst))×10−4.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review D (Particles, Fields, Gravitation and Cosmology) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1550-7998 | ||||
| Official Date: | 3 August 2013 | ||||
| Dates: |
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| Volume: | 88 | ||||
| Number: | 3 | ||||
| Article Number: | 031102(R) | ||||
| DOI: | 10.1103/PhysRevD.88.031102 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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