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.

Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2013). Evidence of B+ -> tau(+)nu decays with hadronic B tags. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(3), 1-9 [10.1103/PhysRevD.88.031102].

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

PATRIGNANI, CLAUDIA;
2013

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.
2013
Lees, J.P., Poireau, V., Tisserand, V., Garra Tico, J., Grauges, E., Palano, A., et al. (2013). Evidence of B+ -> tau(+)nu decays with hadronic B tags. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 88(3), 1-9 [10.1103/PhysRevD.88.031102].
Lees, J. P.; Poireau, V.; Tisserand, V.; Garra Tico, J.; Grauges, E.; Palano, A.; Eigen, G.; Stugu, B.; Brown, D. N.; Kerth, L. T.; Kolomensky, Yu. G....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/535537
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