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| Home > Publications database > Measurement of $R ( D )$ and $R ( D^ * )$ with a Semileptonic Tagging Method |
| Journal Article | PUBDB-2020-02372 |
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2020
APS
College Park, Md.
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Please use a persistent id in citations: doi:10.1103/PhysRevLett.124.161803 doi:10.3204/PUBDB-2020-02372
Report No.: Belle-2019-18; KEK-2019-40; arXiv:1910.05864
Abstract: The experimental results on the ratios of branching fractions R(D)=B(¯B→Dτ−¯ντ)/B(¯B→Dℓ−¯νℓ) and R(D∗)=B(¯B→D∗τ−¯ντ)/B(¯B→D∗ℓ−¯νℓ), where ℓ denotes an electron or a muon, show a long-standing discrepancy with the standard model predictions, and might hint at a violation of lepton flavor universality. We report a new simultaneous measurement of R(D) and R(D∗), based on a data sample containing 772×106 B¯B events recorded at the Υ(4S) resonance with the Belle detector at the KEKB e+e− collider. In this analysis the tag-side B meson is reconstructed in a semileptonic decay mode and the signal-side τ is reconstructed in a purely leptonic decay. The measured values are R(D)=0.307±0.037±0.016 and R(D∗)=0.283±0.018±0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the standard model predictions within 0.2, 1.1, and 0.8 standard deviations for R(D), R(D∗), and their combination, respectively. This work constitutes the most precise measurements of R(D) and R(D∗) performed to date as well as the first result for R(D) based on a semileptonic tagging method
Keyword(s): electron positron: annihilation ; electron positron: colliding beams ; B: pair production ; Upsilon(10570): electroproduction ; B: semileptonic decay ; B: branching ratio ; branching ratio: ratio: measured ; D: hadronic decay ; D*(2010): hadronic decay ; mass difference: (D*(2010) D) ; BELLE ; KEK-B ; experimental results ; B --> D tau- antineutrino/tau ; B --> D*(2010) tau- antineutrino/tau ; D0 --> K- pi+ pi0 ; D0 --> K- 2pi+ pi- ; D0 --> K- pi+ ; D0 --> K0(S) pi+ pi- ; D0 --> K0(S) pi0 ; D0 --> K0(S) K+ K- ; D0 --> K+ K- ; D0 --> pi+ pi- ; D+ --> K- 2pi+ ; D+ --> K0(S) pi+ pi0 ; D+ --> K0(S) 2pi+ pi- ; D+ --> K0(S) pi+ ; D+ --> K- K+ pi+ ; D+ --> K0(S) K+ ; D*(2010)+ --> D0 pi+ ; D*(2010)+ --> D+ pi0 ; D*(2010)0 --> D0 pi0
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Preprint/Report
Measurement of $\mathcal{R}(D)$ and $\mathcal{R}(D^*)$ with a semileptonic tagging method
1-8 (2019) [10.3204/PUBDB-2019-04591]
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