Measurement of the Top Quark Mass at CDFII

The authors describe a measurement of the top quark mass using events with two charged leptons collected by the CDF II Detector from p(bar p) collisions with √s = 1.96 TeV at the Fermilab Tevatron. The posterior probability distribution of the top quark pole mass is calculated using the differential cross-section for the t(bar t) production and decay expressed with respect to observed leptons and jets momenta. The presence of back-ground events in the collected sample is modeled using calculations of the differential cross-sections for major background processes. This measurement represents the first application of this method to events with two charged leptons. In a data sample with integrated luminosity of 340 pb-1, they observe 33 candidate events and measure Mtop = 165.2 ± 6.1stat ± 3.4(syst) GeV/c2