Abstract:
We report a measurement of the top-quark mass, Mt, in the dilepton decay channel of t tbar-->b l nu + b l nu using an integrated luminosity of 1.0/fb of p-pbar collisions collected with the CDF II detector. We apply a method that convolutes a leading-order matrix element with detector resolution functions to form event-by-event likelihoods; we have enhanced the leading-order description to describe the effects of initial-state radiation. The joint likelihood is the product of the likelihoods from 78 candidate events in this sample, which yields a measurement of Mt = 164.5 +- 3.9(stat.) +- 3.9(syst.) GeV/c^2, the most precise measurement of Mt in the dilepton channel.
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