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Phys. Rev. D 61, 052001 (2000) [19 pages]

Measurement of B⃗ρlν decay and |Vub|

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B. H. Behrens et al. (CLEO Collaboration)
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Received 24 May 1999; published 7 February 2000

Using a sample of 3.3×106 Υ(4S)→BB̅ events collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we measure B(B⃗ρlν), |Vub|, and the partial rate (ΔΓ) in three bins of q2≡(pB-pρ)2. We find B(B0→ρ-l+ν)=(2.69±0.41-0.40+0.35±0.50)×10-4, |Vub|=(3.23±0.24-0.26+0.23±0.58)×10-3, ΔΓ(0<q2<7GeV2/c4)=(7.6±3.0-1.2+0.9±3.0)×10-2ns-1, ΔΓ(7<q2<14GeV2/c4)=(4.8±2.9-0.8+0.7±0.7)×10-2ns-1, and ΔΓ(14<q2<21GeV2/c4)=(7.1±2.1-1.1+0.9±0.6)×10-2ns-1. Here, l=e or μ, but not both, and the errors are statistical, systematic, and theoretical. The method is sensitive primarily to B⃗ρlν decays with leptons in the energy range above 2.3 GeV. Averaging with the previously published CLEO results for B⃗ρlν, we obtain B(B0→ρ-l+ν)=(2.57±0.29-0.46+0.33±0.41)×10-4 and |Vub|=(3.25±0.14-0.29+0.21±0.55)×10-3.

© 2000 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.61.052001
DOI:
10.1103/PhysRevD.61.052001
PACS:
13.20.He, 12.15.Hh, 14.40.Nd
 
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