Abstract:
We describe a measurement of the top quark mass using events with two charmed leptons collected by the CDF II detector from p anti-p collisions with s**(1/2) = 1.96 TeV at the Fermilab Tevatron. The likelihood in top mass is calculated for each event by convoluting the leading order matrix element describing qqbar --> t anti-t --> b l nu_l b-bar l' nu_l' with detector resolution functions. The presence of background events in the data sample is modeled using similar calculations involving the matrix elements for major background processes. In a data sample with integrated luminosity of 340 pb-1, we observe 33 candidate events and measure M_top = 165.2 +/- 6.1(stat.) +/- 3.4(syst.) GeV/c2. This measurement represents the first application of this method to events with two charged leptons and is the most precise single measurement of the top quark mass in this channel.
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