The kinematic properties of tt ̄ 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 tt ̄ production are compared with those expected from Monte Carlo calculations. A sample of 34 events rich in tt ̄ 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 tt ̄ matrix element with color coherent parton shower evolution.
