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Measurement of the B̄0 → D *+ℓ-ν̄ℓ decay rate and |Vcb|

Abstract:

We present a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| based on a sample of about 53 700 B̄0 → D*+ℓ-ν̄ℓ decays observed by the BABAR detector. We obtain the branching fraction averaged over ℓ = e, μ, B(B̄0 → D*+ℓ -ν̄ℓ) = (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 B̄0 rest frame. By extrapolating dΓ/dw to the kinematic limit w → 1, we extract the product of |V cb| and the...

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Publisher copy:
10.1103/PhysRevD.71.051502

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Journal:
Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume:
71
Issue:
5
Pages:
1-8
Publication date:
2005-03-01
DOI:
ISSN:
1550-7998
URN:
uuid:fe6fb8e2-42c5-49fa-97b4-07d7e417e399
Source identifiers:
315156
Local pid:
pubs:315156
Language:
English

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