Phys. Rev. D 70, 032002 (2004) [13 pages]Moments of the B meson inclusive semileptonic decay rate using neutrino reconstructionReceived 1 April 2004; published 17 August 2004 We present a measurement of the composition of B meson inclusive semileptonic decays using 9.4 fb-1 of e+e- data taken with the CLEO detector at the Υ(4S) resonance. In addition to measuring the charged lepton kinematics, the neutrino four-vector is inferred using the hermiticity of the detector. We perform a maximum likelihood fit over the full three-dimensional differential decay distribution for the fractional contributions from the B⃗Xclν processes with Xc=D, D*, D**, and nonresonant Xc, and the process B⃗Xulν. From the fit results we extract the first and second moments of the MX2 and q2 distributions with minimum lepton-energy requirements of 1.0 GeV and 1.5 GeV. We find 〈MX2-MD2〉=(0.456±0.014±0.045±0.109)GeV2/c4 with a minimum lepton energy of 1.0 GeV and 〈MX2-MD2〉=(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. As a test of the HQET and OPE calculations, the results for the MX2 moment as a function of the minimum lepton energy requirement are compared to the predictions. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.70.032002
DOI:
10.1103/PhysRevD.70.032002
PACS:
13.20.He, 12.15.Hh, 12.39.Hg
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