Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method

Standard

Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method. / The BELLE collaboration ; Жилич, Виктор Николаевич.

In: Physical Review Letters, Vol. 124, No. 16, 161803, 24.04.2020.

Research output: Contribution to journal › Article › peer-review

Harvard

The BELLE collaboration & Жилич, ВН 2020, 'Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method', Physical Review Letters, vol. 124, no. 16, 161803. https://doi.org/10.1103/PhysRevLett.124.161803

APA

The BELLE collaboration, & Жилич, В. Н. (2020). Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method. Physical Review Letters, 124(16), [161803]. https://doi.org/10.1103/PhysRevLett.124.161803

Vancouver

The BELLE collaboration, Жилич ВН. Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method. Physical Review Letters. 2020 Apr 24;124(16):161803. doi: 10.1103/PhysRevLett.124.161803

Author

The BELLE collaboration ; Жилич, Виктор Николаевич. / Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method. In: Physical Review Letters. 2020 ; Vol. 124, No. 16.

BibTeX

@article{d38768a109e3432085a905a7108c0b2f,

title = "Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method",

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 BB 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.",

keywords = "DECAYS",

author = "{The BELLE collaboration} and G. Caria and P. Urquijo and I. Adachi and H. Aihara and {Al Said}, S. and Asner, {D. M.} and H. Atmacan and T. Aushev and V. Babu and I. Badhrees and S. Bahinipati and Bakich, {A. M.} and P. Behera and C. Bele{\~n}o and J. Bennett and B. Bhuyan and T. Bilka and J. Biswal and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and M. Campajola and D. {\v C}ervenkov and P. Chang and R. Cheaib and V. Chekelian and A. Chen and Cheon, {B. G.} and K. Chilikin and Cho, {H. E.} and K. Cho and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and N. Dash and {De Nardo}, G. and {Di Capua}, F. and {Di Carlo}, S. and Z. Dole{\v z}al and S. Eidelman and D. Epifanov and N. Gabyshev and A. Garmash and P. Krokovny and D. Matvienko and V. Shebalin and B. Shwartz and Y. Usov and V. Zhulanov and Жилич, {Виктор Николаевич}",

year = "2020",

month = apr,

day = "24",

doi = "10.1103/PhysRevLett.124.161803",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "16",

}

RIS

TY - JOUR

T1 - Measurement of R (D) and R (D∗) with a Semileptonic Tagging Method

AU - The BELLE collaboration

AU - Caria, G.

AU - Urquijo, P.

AU - Adachi, I.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aushev, T.

AU - Babu, V.

AU - Badhrees, I.

AU - Bahinipati, S.

AU - Bakich, A. M.

AU - Behera, P.

AU - Beleño, C.

AU - Bennett, J.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswal, J.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Campajola, M.

AU - Červenkov, D.

AU - Chang, P.

AU - Cheaib, R.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - Dash, N.

AU - De Nardo, G.

AU - Di Capua, F.

AU - Di Carlo, S.

AU - Doležal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Krokovny, P.

AU - Matvienko, D.

AU - Shebalin, V.

AU - Shwartz, B.

AU - Usov, Y.

AU - Zhulanov, V.

AU - Жилич, Виктор Николаевич

PY - 2020/4/24

Y1 - 2020/4/24

N2 - 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 BB 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.

AB - 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 BB 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.

KW - DECAYS

UR - http://www.scopus.com/inward/record.url?scp=85084721463&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.124.161803

DO - 10.1103/PhysRevLett.124.161803

M3 - Article

C2 - 32383937

AN - SCOPUS:85084721463

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 16

M1 - 161803

ER -

ID: 24310773