Research Papers in Physics and Astronomy


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Published by American Physical Society. Copyright © 2005 American Physical Society. Permission to use. Phys. Rev. D 72, 032002 (2005).


We present a measurement of the t[overline t] production cross section using 194 pb-1 of CDF II data using events with a high transverse momentum electron or muon, three or more jets, and missing transverse energy. The measurement assumes 100% t→Wb branching fraction. Events consistent with tt̅ decay are found by identifying jets containing heavy-flavor semileptonic decays to muons. The dominant backgrounds are evaluated directly from the data. Based on 20 candidate events and an expected background of 9.5±1.1 events, we measure a production cross section of 5.3±3.3-1.0+1.3 pb, in agreement with the standard model.

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