Improved Measurement of |Vcb| Using B¯D*ν¯ Decays

R. A. Briere et al. (CLEO Collaboration)
Phys. Rev. Lett. 89, 081803 – Published 6 August 2002

Abstract

We determine the weak coupling |Vcb| between the b and c quarks using a sample of 3×106 BB¯ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B¯D*ν¯ decays as a function of w, the boost of the D* in the B rest frame, and from this we obtain the differential decay rate dΓ/dw. By extrapolating dΓ/dw to w=1, the kinematic end point at which the D* is at rest relative to the B, we extract the product |Vcb|F(1), where F(1) is the form factor at w=1. Combined with theoretical results for F(1) we determine |Vcb|=0.0469±0.0014(stat)±0.0020(syst)±0.0018(theor).

  • Figure
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  • Received 11 March 2002

DOI:https://doi.org/10.1103/PhysRevLett.89.081803

©2002 American Physical Society

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Vol. 89, Iss. 8 — 19 August 2002

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