Published in:
Physical Review D 70,3 (2004) 032002;
Link to original published article:
http://dx.doi.org/10.1103/PhysRevD.70.032002
Abstract
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 Y(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 B-->X(c)lnu processes with X-c=D, D-*, D-**, and nonresonant X-c, and the process B-->X(u)lnu. From the fit results we extract the first and second moments of the M-X(2) and q(2) distributions with minimum lepton-energy requirements of 1.0 GeV and 1.5 GeV. We find =(0.456+/-0.014+/-0.045+/-0.109) GeV2/c(4) with a minimum lepton energy of 1.0 GeV and =(0.293+/-0.012+/-0.033+/-0.048) GeV2/c(4) 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 M-X(2) moment as a function of the minimum lepton energy requirement are compared to the predictions.
Keywords
lund monte-carlo;; form-factors;; radiative-corrections;; jet fragmentation;; dispersive bounds;; e+e-physics;; qcd;; detector;; update;; model
Date of this Version
January 2004