Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-03-30
Phys.Rev.D70:032003,2004
Physics
High Energy Physics
High Energy Physics - Experiment
36 pages postscript, als available through http://w4.lns.cornell.edu/public/CLNS/, Submitted to PRD (back-to-back with prece
Scientific paper
10.1103/PhysRevD.70.032003
We report a new measurement of the B-meson semileptonic decay momentum spectrum that has been made with a sample of 9.4/fb of electron-positron annihilation data collected with the CLEO II detector at the Y(4S) resonance. Electrons from primary semileptonic decays and secondary charm decays were separated by using charge and angular correlations in Y(4S) events with a high-momentum lepton and an additional electron. We determined the semileptonic branching fraction to be (10.91 +- 0.09 +- 0.24)% from the normalization of the electron-energy spectrum. We also measured the moments of the electron energy spectrum with minimum energies from 0.6 GeV to 1.5 GeV.
CLEO Collaboration
Mahmood A. H.
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