Kinematics of tt̅ events at CD

Authors

• F. Abe, National Laboratory for High Energy Physics (KEK), Tsukuba, Ibaraki 305, Japan
• Kenneth A. Bloom, University of Nebraska-LincolnFollow
• Collider Detector at Fermilab Collaboration

Document Type

Article

Date of this Version

5-1-1999

Comments

Published by American Physical Society. Phys. Rev. D 59, 092001 (1999). http://prd.aps.org. Copyright © 1999 American Physical Society. Permission to use.

Abstract

The kinematic properties of tt̅ events are studied in the W + multijet channel using data collected with the CDF detector during the 1992–1995 runs at the Fermilab Tevatron collider corresponding to an integrated luminosity of 109 pb^-1. Distributions of a variety of kinematic variables chosen to be sensitive to different aspects of tt̅ production are compared with those expected from Monte Carlo calculations. A sample of 34 events rich in tt̅ pairs is obtained by requiring at least one jet identified by the silicon vertex detector (SVX) as having a displaced vertex consistent with the decay of a b hadron. The data are found to be in good agreement with predictions of the leading order tt̅ matrix element with color coherent parton shower evolution.