Symmetry Tests in Polarized Z0 Decays to bbg
Abstract
Description
Angular asymmetries have been measured in polarized Z0 decays to bbg collected by the SLD experiment at the SLC.
A high purity bbg event sample is selected by utilizing B lifetime information given by the SLD CCD pixel vertex detector and the stable micron-size SLC beams, and the b- and bbar-jets are identified using lifetime information and momentum-weighted track charge.
The forward-backward asymmetry is observed in the b-quark polar angle distribution, and the parity-violation parameter is measured to test the Standard Model.
Two angular correlations between the three-jet plane and the Z0 polarization are studied.
The CP-even and T-odd, and the CP-odd and T-odd, angular asymmetries are sensitive to physics beyond the Standard Model. The latter requires tagging both the b- and bbar-jet. We measure the expectation values of these quantities to be consistent with zero and set limits on the correlations at the 5% level.
20 pages, 5 figures
20 pages, 5 figures