Measurement of the CKM matrix element
We present a new measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| from B0→D∗-ℓ+νℓ decays, reconstructed with the full Belle data set of 711 fb-1 integrated luminosity. Two form factor parametrizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product F(1)ηEW|Vcb| and the decay form factors, where F(1) is the normalization factor and ηEW is a small electroweak correction. In the CLN parametrization we find F(1)ηEW|Vcb|=(35.06±0.15±0.56)×10-3, ρ2=1.106±0.031±0.007, R1(1)=1.229±0.028±0.009, R2(1)=0.852±0.021±0.006. For the BGL parametrization we obtain F(1)ηEW|Vcb|=(34.93±0.23±0.59)×10-3, which is consistent with the world average when correcting for F(1)ηEW. The branching fraction of B0→D∗-ℓ+νℓ is measured to be B(B0→D∗-ℓ+νℓ)=(4.90±0.02±0.16)%. We also present a new test of lepton flavor universality violation in semileptonic B decays, B(B0→D∗-e+ν)B(B0→D∗-μ+ν)=1.01±0.01±0.03. The errors quoted correspond to the statistical and systematic uncertainties, respectively. This is the most precise measurement of F(1)ηEW|Vcb| and form factors to date and the first experimental study of the BGL form factor parametrization in an experimental measurement.
Waheed, E; Urquijo, P; Ferlewicz, D; Adachi, I; Adamczyk, K; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aushev, T; Ayad, R; Babu, V; Badhrees, I; Bansal, V; Behera, P; Beleño, C; Bernlochner, F; Bhuyan, B; Bilka, T; Biswal, J; Bobrov, A; Bonvicini, G; Bozek, A; Bračko, M; Browder, TE; Campajola, M; Červenkov, D; Chang, P; Chekelian, V; Chen, A; Cheon, BG; Chilikin, K; Cho, HE; Cho, K; Choi, SK; Choi, Y; Choudhury, S; Cinabro, D; Cunliffe, S; Di Carlo, S; DoleŽal, Z; Dong, TV; Dossett, D; Eidelman, S; Epifanov, D; Fast, JE; Fulsom, BG; Garg, R; Gaur, V; Garmash, A; Giri, A; Goldenzweig, P; Golob, B; Grzymkowska, O; Haba, J; Hara, T; Hayasaka, K; Hayashii, H; Hedges, MT; Hou, WS; Hsu, CL; Iijima, T; Inami, K; Inguglia, G; Ishikawa, A; Iwasaki, M; Iwasaki, Y; Jacobs, WW; Jeon, HB; Jia, S; Jin, Y; Joffe, D; Joo, KK; Kahn, J; Kaliyar, AB; Karyan, G; Kawasaki, T; Kim, CH; Kim, DY; Kim, KT; Kim, SH; Kinoshita, K; Kodyš, P; Korpar, S; Kotchetkov, D; KriŽan, P; Kroeger, R; Krokovny, P; Kuhr, T; Kulasiri, R; Kuzmin, A; Kwon, YJ; Lange, JS; Lee, JY; Lee, SC; Li, CH; Li, LK; Li, YB; Li Gioi, L; Libby, J
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