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Measurement of the B¯0D*+ν¯ decay rate and |Vcb|

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 71, 051502(R) – Published 15 March 2005

Abstract

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53 700 B¯0D*+ν¯ decays observed by the BABAR detector. We obtain the branching fraction averaged over =e,μ, B(B¯0D*+ν¯)=(4.90±0.07(stat.)0.35+0.36(syst.))%. We measure the differential decay rate as a function of w, the relativistic boost γ of the D*+ in the B¯0 rest frame. By extrapolating dΓ/dw to the kinematic limit w1, we extract the product of |Vcb| and the axial form factor A1(w=1). We combine this measurement with a lattice QCD calculation of A1(w=1) to determine |Vcb|=(38.7±0.3(stat.)±1.7(syst.)1.3+1.5(theory))×103.

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  • Received 11 August 2004

DOI:https://doi.org/10.1103/PhysRevD.71.051502

©2005 American Physical Society

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Vol. 71, Iss. 5 — 1 March 2005

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