Measurement of the decay B →dℓνℓ in fully reconstructed events and determination of the Cabibbo-Kobayashi-Maskawa matrix element
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.
Glattauer, R; Schwanda, C; Abdesselam, A; Adachi, I; Adamczyk, K; Aihara, H; Al Said, S; Asner, DM; Aushev, T; Ayad, R; Aziz, T; Badhrees, I; Bakich, AM; Bansal, V; Barberio, E; Bhuyan, B; Biswal, J; Bonvicini, G; Bozek, A; Bračko, M; Breibeck, F; Browder, TE; Červenkov, D; Chekelian, V; Chen, A; Cheon, BG; 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, JE; Ferber, T; Frey, A; Fulsom, BG; Gaur, V; Gabyshev, N; Garmash, A; Gillard, R; Goh, YM; Goldenzweig, P; Golob, B; Greenwald, D; Haba, J; Hamer, P; Hara, T; Hasenbusch, J; Hayasaka, K; Hayashii, H; Hou, WS; Hsu, CL; Iijima, T; Inami, K; Inguglia, G; Ishikawa, A; Jeon, HB; Joffe, D; Joo, KK; Julius, T; Kang, KH; Kato, E; Kawasaki, T; Kiesling, C; Kim, DY; Kim, JB; Kim, JH; Kim, KT; Kim, MJ; Kim, SH; Kim, YJ; Kinoshita, K; Kodyš, P; Korpar, S; KriŽan, P; Krokovny, P; Kuhr, T; Kuzmin, A; Kwon, YJ; Lee, IS; Li, L; Li, Y; Libby, J; Liu, Y; Liventsev, D; Lukin, P; Macnaughton, J; Masuda, M; Matvienko, D; Miyabayashi, K; Miyata, H
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