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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/132497
Measurement of the Ratio of the B0→D*−τ+ντ and B0→D*−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays
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The ratio of branching fractions R ( D * − ) ≡ B ( B 0 → D * − τ + ν τ ) / B ( B 0 → D * − μ + ν μ ) 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 . For the first time, R ( D * − ) is determined using the τ -lepton decays with three charged pions in the final state. The B 0 → D * − τ + ν τ yield is normalized to that of the B 0 → D * − π + π − π + mode, providing a measurement of B ( B 0 → D * − τ + ν τ ) / B ( B 0 → D * − π + π − π + ) = 1.97 ± 0.13 ± 0.18 , where the first uncertainty is statistical and the second systematic. The value of B ( B 0 → D * − τ + ν τ ) = ( 1.42 ± 0.094 ± 0.129 ± 0.054 ) % is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the B 0 → D * − μ + ν μ decay, a value of R ( D * − ) = 0.291 ± 0.019 ± 0.026 ± 0.013 is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and B 0 → D * − μ + ν μ modes. This measurement is in agreement with the standard model prediction and with previous results.
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ALFONSO ALBERO, Alejandro, BADALOV, Alexey, CALVO GÓMEZ, Míriam, CAMBONI, Alessandro, COQUEREAU, Samuel, FERNANDEZ, G., GARRIDO BELTRÁN, Lluís, GASCÓN FORA, David, GRACIANI DÍAZ, Ricardo, GRAUGÉS POUS, Eugeni, MARIN BENITO, Carla, PICATOSTE OLLOQUI, Eduardo, RIVES MOLINA, Vicente josé, VILASIS-CARDONA, Xavier, LHCb Collaboration. Measurement of the Ratio of the B0→D*−τ+ντ and B0→D*−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays. _Physical Review Letters_. 2018. Vol. 120, núm. 17, pàgs. 171802. [consulta: 27 de gener de 2026]. ISSN: 0031-9007. [Disponible a: https://hdl.handle.net/2445/132497]