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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2016, vol. 93, 3, p. -

Measurement of the decay B →dℓνℓ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb |

Glattauer R., Schwanda C., Abdesselam A., Adachi I., Adamczyk K., Aihara H., Al Said S., Asner D. M., Aushev T., Ayad R., Aziz T., Badhrees I., Bakich A. M., Bansal V., Barberio E., Bhuyan B., Biswal J., Bonvicini G., Bozek A., Bračko M., Breibeck F., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., Dash N., Dingfelder J., DoleŽal Z., Drutskoy A., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Frey A., Fulsom B. G., Gaur V., Gabyshev N., Garmash A., Gillard R., Goh Y. M., Goldenzweig P., Golob B., Greenwald D., Haba J., Hamer P., Hara T., Hasenbusch J., Hayasaka K., Hayashii H., Hou W. S., Hsu C. L., Iijima T., Inami K., Inguglia G., Ishikawa A., Jeon H. B., Joffe D., Joo K. K., Julius T., Kang K. H., Kato E., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Kodyš P., Korpar S., KriŽan P., Krokovny P.

© 2016 American Physical Society.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-→ (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.