Abstract:
We report a measurement of the top quark mass using events collected by the CDF II Detector from p anti-p collisions at s**(1/2) = 1.96 TeV at the Fermilab Tevatron. We calculate a likelihood function for the top mass in events that are consistent with t anti-t --> b-bar l- nu-bar_l bl'+ nu'_l decays. The likelihood is formed as the convolution of the leading-order matrix element and detector resolution functions. The joint likelihood is the product of likelihoods for each of 33 events collected in 340 pb-1 of integrated luminosity, yielding a top quark mass M_t = 165.2 +/- 6.1(stat.) +/- 3.4(syst.) GeV/c2. This first application of a matrix-element technique to tt-bar --> bl+ nu_l b-bar l'- nu-bar_l' decays gives the most precise single measurement of M_t in dilepton events. Combined with other CDF Run II measurements using dilepton events, we measure M_t = 167.9 +/- 5.2(stat.) +/- 3.7(syst.) GeV/c2.
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