Research Papers in Physics and Astronomy


Date of this Version

July 2005


Published by American Physical Society. Phys. Rev. Lett. 95, 022001 (2005). © 2005 American Physical Society. Permission to use.


We report on a search for anomalous kinematics of tt̅ dilepton events in pp̅ collisions at √s =1.96 TeV using 193 pb-1 of data collected with the CDF II detector. We developed a new a priori technique designed to isolate the subset in a data sample revealing the largest deviation from standard model (SM) expectations and to quantify the significance of this departure. In the four-variable space considered, no particular subset shows a significant discrepancy, and we find that the probability of obtaining a data sample less consistent with the SM than what is observed is 1.0%–4.5%.

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