A measurement of |V<inf>cb</inf>| from B<sup>0</sup> → D<sup>*+</sup>ℓ<sup>-</sup>ν<inf>ℓ</inf>

D. Buskulic, D. Casper, I. De Bonis, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, M. N. Minard, P. Odier, B. Pietrzyk, F. Ariztizabal, M. Chmeissani, J. M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, V. Gaitan, Ll Garrido, M. MartinezS. Orteu, A. Pacheco, C. Padilla, F. Palla, A. Pascual, J. A. Perlas, F. Sanchez, F. Teubert, A. Colaleo, D. Creanza, M. de Palma, A. Farilla, G. Gelao, M. Girone, G. Iaselli, G. Maggi, M. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, G. Bonvicini, D. G. Cassel, M. Cattaneo, P. Comas, P. Coyle, H. Drevermann, A. Engelhardt, R. W. Forty, M. Frank, R. Hagelberg, J. Harvey, R. Jacobsen, P. Janot, B. Jost, J. Knobloch, I. Lehraus, C. Markou, E. B. Martin, P. Mato, H. Meinhard, A. Minten, R. Miquel, K. Moffeit, T. Oest, P. Palazzi, J. R. Pater, J. F. Pusztaszeri, F. Ranjard, P. Rensing, L. Rolandi, D. Schlatter, M. Schmelling, O. Schneider, W. Tejessy, I. R. Tomalin, A. Venturi, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni

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Abstract

From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep, a sample of 410 ± 32 B0 → D*+ℓ-νℓ candidates is selected, where ℓ is either an electron or a muon. The differential decay rate dΓ (B0 → D*+ℓ-νℓ) dω from this sample is fitted, yielding a value for the product of the CKM matrix element |Vcb| and the normalisation of the decay form factor at the point of zero recoil of the D*+ meson F(ω = 1)|Vcb| = (31.4 ± 2.3stat ± 2.5syst) × 10-3. A value for |Vcb| is extracted using theoretical calculations of the form factor normalisation, with the result |Vcb| = (34.5 ± 2.5stat ± 2.7syst ± 1.5theory) × 10-3. From the integrated s the measured branching fraction is Br(B0 → D*+ℓ-νℓ) = (5.18 ± 0.30stat ± 0.62syst)%. © 1995.
Original languageEnglish
Pages (from-to)236-248
JournalPhysics Letters B
Volume359
Issue number1-2
DOIs
Publication statusPublished - 5 Oct 1995

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