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Test of lepton flavor universality by the measurement of the B0 →d∗-τ+ντ branching fraction using three-prong τ decays
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The ratio of branching fractions R(D∗−) ≡ B(B0 → D∗−τ +ντ )/B(B0 → D∗−µ +νµ) is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1 . The τ lepton is reconstructed with three charged pions in the final state. A novel method is used that exploits the different vertex topologies of signal and backgrounds to isolate samples of semitauonic decays of b hadrons with high purity. Using the B0 →D∗−π +π −π + decay as the normalization channel, the ratio B(B0 → D∗−τ +ντ )/B(B0 → D∗−π +π −π +) is measured to be 1.97±0.13±0.18, where the first uncertainty is statistical and the second systematic. An average of branching fraction measurements for the normalization channel is used to derive B(B0 → D∗−τ +ντ ) = (1.42 ± 0.094 ± 0.129 ± 0.054)%, where the third uncertainty is due to the limited knowledge of B(B0 → D∗−π +π −π +). A test of lepton flavor universality is performed using the well-measured branching fraction B(B0 → D∗−µ +νµ) to compute R(D∗−) = 0.291 ± 0.019 ± 0.026 ± 0.013, where the third uncertainty originates from the uncertainties on B(B0 → D∗−π +π −π +) and B(B0 → D∗−µ +νµ). This measurement is in agreement with the Standard Model prediction and with previous measurements.
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ALFONSO ALBERO, Alejandro, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, LHCb Collaboration. Test of lepton flavor universality by the measurement of the B0 →d∗-τ+ντ branching fraction using three-prong τ decays. _Physical Review D_. 2018. Vol. 97, núm. 7, pàgs. 1-43. [consulta: 20 de gener de 2026]. ISSN: 2470-0010. [Disponible a: https://hdl.handle.net/2445/185390]