Symmetry Tests in Polarized Z0 Decays to bbg
Abstract
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.
Cite
@article{arxiv.hep-ex/9908031,
title = {Symmetry Tests in Polarized Z0 Decays to bbg},
author = {SLD Collaboration and K. Abe},
journal= {arXiv preprint arXiv:hep-ex/9908031},
year = {2007}
}
Comments
20 pages, 5 figures