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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 $|V_cb|$

Submit Time: 2016-09-12
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Institute: 1.Belle Collaboration;

## Abstracts

 We present a determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element?|Vcb|?using the decay?B→D?ν??(?=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→D?ν??is found to be?B(B0→D??+ν?)=(2.31±0.03(stat)±0.11(syst))%. Analyzing the differential decay rate as a function of the hadronic recoil with the parameterization of Caprini, Lelouch 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 parameterization 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.
Recommended references： Glattauer, R. and others.(2016).Measurement of the decay $B\to D\ell\nu_\ell$ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element $|V_cb|$.[ChinaXiv:201609.00770] (Click&Copy)
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