LHCb has performed the first measurement at a hadron collider of a b-hadron decay into a final state with τ leptons. The analysis uses a sample of proton-proton collision data corresponding to 3 fb-1 of integrated luminosity recorded by LHCb at √s = 7 and √s = 8 TeV. The branching fraction of B0→ D∗+tτ-vτ decays, where the muonic decay τ- → μ- Vμ vτ is considered, is measured relative to the branching fraction for B0→ D∗+tμ-vtμ decays. The ratio is measured to be R(D∗) = (Equation presented) = 0.336±0.027(stat.) ±0.030(syst.) in good agreement with previous measurements and 2.1 standard deviations larger than the SM expectation, which assumes lepton universality.
Calvi, M. (2016). B0→ D∗+τ-vτ at LHCb. In 23rd European Physical Society Conference on High Energy Physics, EPS-HEP 2015. Proceedings of Science (PoS) [10.22323/1.234.0539].
B0→ D∗+τ-vτ at LHCb
Calvi M.
2016
Abstract
LHCb has performed the first measurement at a hadron collider of a b-hadron decay into a final state with τ leptons. The analysis uses a sample of proton-proton collision data corresponding to 3 fb-1 of integrated luminosity recorded by LHCb at √s = 7 and √s = 8 TeV. The branching fraction of B0→ D∗+tτ-vτ decays, where the muonic decay τ- → μ- Vμ vτ is considered, is measured relative to the branching fraction for B0→ D∗+tμ-vtμ decays. The ratio is measured to be R(D∗) = (Equation presented) = 0.336±0.027(stat.) ±0.030(syst.) in good agreement with previous measurements and 2.1 standard deviations larger than the SM expectation, which assumes lepton universality.
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