The branching fraction B(B0 → D*− τ+ ν_τ) is measured relative to that of the normalization mode B0 → D*− π+ π− π+ using hadronic τ+ → π+ π− π+ (π0) anti-ν_τ decays in proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb^−1. The measured ratio is B(B0 → D*− τ+ ν_τ) / B(B0 → D*− π+ π− π+) = 1.70 ± 0.10{−0.10}{+0.11}, where the first uncertainty is statistical and the second is related to systematic effects. Using established branching fractions for the B0 → D*− π+ π− π+ and B0 → D*− μ+ ν_μ modes, the lepton universality test R(D*−) ≡ B(B0 → D*− τ+ ν_τ) / B(B0 → D*− μ+ ν_μ) is calculated, R(D*−) = 0.247 ± 0.015 ± 0.015 ± 0.012, where the third uncertainty is due to the uncertainties on the external branching fractions. This result is consistent with the Standard Model prediction and with previous measurements.

Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Test of Lepton Flavor Universality Using B0 → D*− τ+ ν_τ Decays with Hadronic τ Channels. PHYSICAL REVIEW D, 108(1), 1-18 [10.1103/PhysRevD.108.012018].

Test of Lepton Flavor Universality Using B0 → D*− τ+ ν_τ Decays with Hadronic τ Channels

Carbone, A.;Ferrari, F.;Galli, D.;Manuzzi, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zucchelli, S.;
2023

Abstract

The branching fraction B(B0 → D*− τ+ ν_τ) is measured relative to that of the normalization mode B0 → D*− π+ π− π+ using hadronic τ+ → π+ π− π+ (π0) anti-ν_τ decays in proton-proton collision data at a center-of-mass energy of 13 TeV collected by the LHCb experiment, corresponding to an integrated luminosity of 2 fb^−1. The measured ratio is B(B0 → D*− τ+ ν_τ) / B(B0 → D*− π+ π− π+) = 1.70 ± 0.10{−0.10}{+0.11}, where the first uncertainty is statistical and the second is related to systematic effects. Using established branching fractions for the B0 → D*− π+ π− π+ and B0 → D*− μ+ ν_μ modes, the lepton universality test R(D*−) ≡ B(B0 → D*− τ+ ν_τ) / B(B0 → D*− μ+ ν_μ) is calculated, R(D*−) = 0.247 ± 0.015 ± 0.015 ± 0.012, where the third uncertainty is due to the uncertainties on the external branching fractions. This result is consistent with the Standard Model prediction and with previous measurements.
2023
Aaij, R., Abdelmotteleb, A., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Test of Lepton Flavor Universality Using B0 → D*− τ+ ν_τ Decays with Hadronic τ Channels. PHYSICAL REVIEW D, 108(1), 1-18 [10.1103/PhysRevD.108.012018].
Aaij, R.; Abdelmotteleb, A.S.W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/952696
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