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A measurement of $\mid V_{cb} \mid$ from $\overline{B}^0 \rightarrow D^{\star +}l^- \overline{\nu}_l$

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  • [Phys:Hexp] Physics/High Energy Physics - Experiment
  • [Phys:Hexp] Physique/Physique Des Hautes Energies - Expérience

Abstract

A measurement of |Vcb| from b/bar^0 -> l- nubar_l EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN-PPE/95-094 29 June 1995 A Measurement of jV cb j from B 0 ! D �+ ` � � ` The ALEPH Collaboration Abstract From approximately 3 million hadronic decays of Z bosons recorded with the aleph detector at lep, a sample of 410� 32 B 0 ! D �+ ` � � ` candidates is selected, where ` is either an electron or a muon. The di�erential decay rate d�(B 0 ! D �+ ` � � ` )=d! from this sample is �tted, yielding a value for the product of the CKM matrix element jV cb j and the normalisation of the decay form factor at the point of zero recoil of the D �+ meson F(! = 1)jV cb j = (31:4�2:3 stat �2:5 syst )�10 �3 . A value for jV cb j is extracted using theoretical calculations of the form factor normalisation, with the result jV cb j = (34:5� 2:5 stat � 2:7 syst � 1:5 theory )� 10 �3 . From the integrated spectrum, the measured branching fraction is Br(B 0 ! D �+ ` � � ` ) = (5:18� 0:30 stat � 0:62 syst )%. (Submitted to Physics Letters B) See following pages for the list of authors The ALEPH Collaboration 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 Laboratoire de Physique des Particules (LAPP), IN 2 P 3 -CNRS, 74019 Annecy-le-Vieux Cedex, France F. Ariztizabal, M. Chmeissani, J.M. Crespo, I. Efthymiopoulos, E. Fernandez, M. Fernandez-Bosman, V. Gaitan, Ll. Garrido, 15 M. Martinez, S. Orteu, A. Pacheco, C. Padilla, F. Palla, A. Pascual, J.A. Perlas, F. Sanchez, F. Teubert Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, 08193 Bellaterra (Barcelona), Spain 7 A. Colaleo, D. Creanza, M. de Palma, A. Farilla, G. Gelao, M. Girone, G. Iaselli, G. Maggi, 3 M. Maggi, N. Marinelli, S. Natali, S. Nuzzo, A. Ranieri, G. Raso,

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