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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

Aaij, R

Physical review. D, 2018-04, Vol.97 (7), p.072013 [Periódico revisado por pares]

College Park: American Physical Society

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  • Título:
    Test of lepton flavor universality by the measurement of the B0→D−τ+ντ branching fraction using three-prong τ decays
  • Autor: Aaij, R
  • Assuntos: Decay ; Flavor (particle physics) ; Hadrons ; Leptons ; Luminosity ; Particle collisions ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Pions ; Statistical analysis ; Statistical methods ; Uncertainty
  • É parte de: Physical review. D, 2018-04, Vol.97 (7), p.072013
  • Notas: AC02-05CH11231
    USDOE Office of Science (SC)
  • Descrição: 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.
  • Editor: College Park: American Physical Society
  • Idioma: Inglês
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