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Measurement of the Ratio of the B0→D−τ+ντ and B0→D−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays

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

Physical review letters, 2018-04, Vol.120 (17) [Periódico revisado por pares]

United States: American Physical Society

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Título:
Measurement of the Ratio of the B0→D−τ+ντ and B0→D−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays
Autor: 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
Assuntos: Experiments ; Física de partícules ; Particle physics ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
É parte de: Physical review letters, 2018-04, Vol.120 (17)
Notas: AC02-05CH11231
USDOE Office of Science (SC)
Descrição: 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.
Editor: United States: American Physical Society
Idioma: Inglês

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Measurement of the Ratio of the B0→D−τ+ντ and B0→D−μ+νμ Branching Fractions Using Three-Prong τ-Lepton Decays

United States: American Physical Society

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