Measurement of Decay and
BH Behrens - arXiv preprint hep-ex/9905056, 1999 - arxiv.org
BH Behrens
arXiv preprint hep-ex/9905056, 1999•arxiv.orgUsing a sample of 3.3 million Upsilon (4S)-> BBbar events collected with the CLEO II
detector at the Cornell Electron Storage Ring (CESR), we measure the branching fraction for
B-> rho l nu,| V_ub|, and the partial rate (Delta Gamma) in three bins of q^ 2=(p_B-p_rho)^ 2.
We find B (B^ 0-> rho^-l^+ nu)=(2.69+-0.41^+ 0.35 _-0.40+-0.50) 10^-4,| V_ub|=(3.23+-
0.24^+ 0.23 _-0.26+-0.58) 10^-3, Delta Gamma (0< q^ 2< 7 GeV^ 2/c^ 4)=(7.6+-3.0^+ 0.9 _-
1.2+-3.0) 10^-2 ns^-1, Delta Gamma (7< q^ 2< 14 GeV^ 2/c^ 4)=(4.8+-2.9^+ 0.7 _-0.8+-0.7) …
detector at the Cornell Electron Storage Ring (CESR), we measure the branching fraction for
B-> rho l nu,| V_ub|, and the partial rate (Delta Gamma) in three bins of q^ 2=(p_B-p_rho)^ 2.
We find B (B^ 0-> rho^-l^+ nu)=(2.69+-0.41^+ 0.35 _-0.40+-0.50) 10^-4,| V_ub|=(3.23+-
0.24^+ 0.23 _-0.26+-0.58) 10^-3, Delta Gamma (0< q^ 2< 7 GeV^ 2/c^ 4)=(7.6+-3.0^+ 0.9 _-
1.2+-3.0) 10^-2 ns^-1, Delta Gamma (7< q^ 2< 14 GeV^ 2/c^ 4)=(4.8+-2.9^+ 0.7 _-0.8+-0.7) …
Using a sample of 3.3 million Upsilon(4S) -> BBbar events collected with the CLEO II detector at the Cornell Electron Storage Ring (CESR), we measure the branching fraction for B -> rho l nu, |V_ub|, and the partial rate (Delta Gamma) in three bins of q^2 = (p_B-p_rho)^2. We find B(B^0 -> rho^- l^+ nu)=(2.69 +- 0.41^+0.35_-0.40 +- 0.50) 10^-4, |V_ub|=(3.23 +- 0.24^+0.23_-0.26 +- 0.58) 10^-3, Delta Gamma (0 < q^2 < 7 GeV^2/c^4) =(7.6 +- 3.0 ^+0.9_-1.2 +- 3.0) 10^-2 ns^-1, Delta Gamma (7 < q^2 < 14 GeV^2/c^4) =(4.8 +- 2.9 ^+0.7_-0.8 +- 0.7) 10^-2 ns^-1, and Delta Gamma (14 < q^2 < 21 GeV^2/c^4) = (7.1 +- 2.1^+0.9_-1.1 +- 0.6)10^-2 ns^-1. The quoted errors are statistical, systematic, and theoretical. The method is sensitive primarily to B -> rho l nu decays with leptons in the energy range above 2.3 GeV. Averaging with the previously published CLEO results, we obtain B(B^0 -> rho^- l^+ nu) = (2.57 +- 0.29^+0.33_-0.46 +- 0.41) 10^-4 and |V_{ub}| = (3.25 +- 0.14 ^+0.21_-0.29 +- 0.55) 10^-3.
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