Measurement of the decay $B\to D\ell\nu_\ell$ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$

Glattauer, R.; Schwanda, C.; Abdesselam, A.; Adachi, I.; Adamczyk, K.; Aihara, H.; Said, S.Al; Asner, D.M.; Aushev, T.; Ayad, R.

doi:10.1103/PhysRevD.93.032006

Measurement of the decay $B\to D\ell\nu_\ell$ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$

Belle

Collaboration

Oct 13, 2015

14 pages

Published in:

Phys.Rev.D 93 (2016) 3, 032006

Published: Feb 25, 2016

e-Print:

1510.03657 [hep-ex]

DOI:

10.1103/PhysRevD.93.032006

PDG:

{{\mathit B}^{0}}

\rightarrow

{{\mathit D}^{-}}{{\mathit \ell}^{+}}{{\mathit \nu}_{{{{{\mathit \ell}}}}}}

Report number:

BELLE-PREPRINT-2015-16,
KEK-PREPRINT-2015-43

Experiments:

KEK-BF-BELLE

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Abstract: (APS)

We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| using the decay B→Dℓνℓ (ℓ=e,μ) based on 711 fb-1 of e+e-→ϒ(4S) data recorded by the Belle detector and containing 772×106 BB¯ pairs. One B meson in the event is fully reconstructed in a hadronic decay mode, while the other, on the signal side, is partially reconstructed from a charged lepton and either a D+ or D0 meson in a total of 23 hadronic decay modes. The isospin-averaged branching fraction of the decay B→Dℓνℓ is found to be B(B0→D-ℓ+νℓ)=(2.31±0.03(stat)±0.11(syst))%. Analyzing the differential decay rate as a function of the hadronic recoil with the parametrization of Caprini, Lellouch, and Neubert and using the form-factor prediction G(1)=1.0541±0.0083 calculated by FNAL/MILC, we obtain ηEW|Vcb|=(40.12±1.34)×10-3, where ηEW is the electroweak correction factor. Alternatively, assuming the model-independent form-factor parametrization of Boyd, Grinstein, and Lebed and using lattice QCD data from the FNAL/MILC and HPQCD collaborations, we find ηEW|Vcb|=(41.10±1.14)×10-3.

Note:

17 pages, 8 figures and 8 tables, submitted to PRD; changes to previous version: updated affiliations, moved introduction of z, added Vcb result without electroweak correction factor

electron positron: annihilation
B: pair production
B: semileptonic decay
form factor: parametrization
form factor: hadronic
electroweak interaction: correction
recoil: hadronic
B: hadronic decay
B: decay modes
CKM matrix

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Measurement of the decay B→DℓνℓB\to D\ell\nu_\ellB→Dℓνℓ​ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element ∣Vcb∣|V_{cb}|∣Vcb​∣

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Measurement of the decay $B\to D\ell\nu_\ell$ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}|$