The ratios of branching fractions R(D∗)B(B¯→D∗τ-ν¯τ)/B(B¯→D∗μ-ν¯μ) and R(D0)B(B-→D0τ-ν¯τ)/B(B-→D0μ-ν¯μ) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ-→μ-ντν¯μ. The measured values are R(D∗)=0.281±0.018±0.024 and R(D0)=0.441±0.060±0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ=-0.43. The results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the standard model.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of the Ratios of Branching Fractions R (D∗) and R (D0). PHYSICAL REVIEW LETTERS, 131(11) [10.1103/PhysRevLett.131.111802].

Measurement of the Ratios of Branching Fractions R (D∗) and R (D0)

Borsato M.;Calvi M.;Capelli S.;Carniti P.;Fazzini D.;Garcia Pardinas J.;Gotti C.;Kirsebom V. S.;Martinazzoli L.;Martinelli M.;Meloni S.;Minotti A.;Petruzzo M.;Pizzichemi M.;Salomoni M.;Shields E. B.;
2023

Abstract

The ratios of branching fractions R(D∗)B(B¯→D∗τ-ν¯τ)/B(B¯→D∗μ-ν¯μ) and R(D0)B(B-→D0τ-ν¯τ)/B(B-→D0μ-ν¯μ) are measured, assuming isospin symmetry, using a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded by the LHCb experiment during 2011 and 2012. The tau lepton is identified in the decay mode τ-→μ-ντν¯μ. The measured values are R(D∗)=0.281±0.018±0.024 and R(D0)=0.441±0.060±0.066, where the first uncertainty is statistical and the second is systematic. The correlation between these measurements is ρ=-0.43. The results are consistent with the current average of these quantities and are at a combined 1.9 standard deviations from the predictions based on lepton flavor universality in the standard model.
Articolo in rivista - Articolo scientifico
LHCb; Semileptonic Decays; B Physics; Branching Fractions; Tau Lepton;
English
2023
131
11
111802
none
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinen, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of the Ratios of Branching Fractions R (D∗) and R (D0). PHYSICAL REVIEW LETTERS, 131(11) [10.1103/PhysRevLett.131.111802].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/455580
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