Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2002-05-20
Phys.Rev.D66:052001,2002
Physics
High Energy Physics
High Energy Physics - Experiment
24 pages, 8 figures: minor corrections and new version of Fig. 1; (revised July 2002); to appear in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.66.052001
The structure of three-jet e+e- -> b bbar g events has been studied using hadronic Z0 decays recorded in the SLD experiment at SLAC. Three-jet final states were selected and the CCD-based vertex detector was used to identify two of the jets as b or bbar; the remaining jet in each event was tagged as the gluon jet. Distributions of the gluon energy and polar angle with respect to the electron beam were measured over the full kinematic range, and used to test the predictions of perturbative QCD. We find that beyond-leading-order QCD calculations are needed to reproduce the features seen in the data. The energy distribution is sensitive to an anomalous b chromomagnetic moment kappa at the b bbar g vertex. We measured kappa to be consistent with zero and set 95% C.L. limits on its value, -0.06 < kappa < 0.04.
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