Measurement of B-->ρlν decay and \|Vub\|
Abstract
Using a sample of 3.3×106 Υ(4S)-->BB¯ 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+0.35-0.40+/-0.50)×10-4, \|Vub\|=(3.23+/-0.24+0.23-0.26+/-0.58)×10-3, ΔΓ(0<q2<7 GeV2/c4)=(7.6+/-3.0+0.9-1.2+/-3.0)×10-2 ns-1, ΔΓ(7<q2<14 GeV2/c4)=(4.8+/-2.9+0.7-0.8+/-0.7)×10-2 ns-1, and ΔΓ(14<q2<21 GeV2/c4)=(7.1+/-2.1+0.9-1.1+/-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+0.33-0.46+/-0.41)×10-4 and \|Vub\|=(3.25+/-0.14+0.21-0.29+/-0.55)×10-3.
- Publication:
-
Physical Review D
- Pub Date:
- March 2000
- DOI:
- 10.1103/PhysRevD.61.052001
- arXiv:
- arXiv:hep-ex/9905056
- Bibcode:
- 2000PhRvD..61e2001B
- Keywords:
-
- 13.20.He;
- 12.15.Hh;
- 14.40.Nd;
- Decays of bottom mesons;
- Determination of Kobayashi-Maskawa matrix elements;
- Bottom mesons;
- High Energy Physics - Experiment
- E-Print:
- 35 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS