2003/07/29 by G. S. Huang, Huang, G. S.
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/0307081
12 pages postscript, also available through http://w4.lns.cornell.edu/public/CONF/2003, submitted to XXI Intern'l Symp on Lepton and Photon Interact'ns at High Energies, August 2003, Fermilab
arxiv created 2003/07/29 · openalex publication_date 2003/07/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We present a preliminary measurement of the composition of inclusive semileptonic B meson decays using 9.4 fb-1 of e+e- data taken with the CLEO detector at the Upsilon(4S) resonance. In addition to measuring the charged lepton kinematics, the neutrino four-vector is inferred using the hermeticity of the detector. We perform a maximum likelihood fit over the full three-dimensional differential decay distribution for the fractional contributions from the B->Xc l nu processes with Xc = D, D^*, D^**, and non-resonant Xc, and the process B -> Xu l nu. From the fit results we extract <MX2 - MD[Bar]2> = (0.456 +- 0.014 +- 0.045 +- 0.109) GeV2/c4 with minimum lepton energy of 1.0 GeV and <MX2 - MD[Bar]2> (0.293 +- 0.012 +- 0.033 +- 0.048) GeV2/c4 with minimum lepton energy of 1.5 GeV. The uncertainties are from statistics, detector systematic effects, and model dependence, respectively.