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

Measurement of B→ρlν decay and |Vub|

Download: PDF (1032 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

B. H. Behrens et al. (CLEO Collaboration)
Show All Authors/Affiliations

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(B→ρlν), |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<7 GeV2/c4)=(7.6±3.0-1.2+0.9±3.0)×10-2 ns-1, ΔΓ(7<q2<14 GeV2/c4)=(4.8±2.9-0.8+0.7±0.7)×10-2 ns-1, and ΔΓ(14<q2<21 GeV2/c4)=(7.1±2.1-1.1+0.9±0.6)×10-2 ns-1. Here, l=e or μ, but not both, and the errors are statistical, systematic, and theoretical. The method is sensitive primarily to B→ρlν decays with leptons in the energy range above 2.3 GeV. Averaging with the previously published CLEO results for B→ρlν, 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

* Permanent address: University of Texas, Austin, TX 78712.
Permanent address: Yonsei University, Seoul 120-749, Korea.
Permanent address: University of Cincinnati, Cincinnati, OH 45221.

[ Abstract  |  Previous article  |  Next article  |  Issue 5 ]