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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Updated: Wednesday, 2006 April 19 10:47:24 CDT automatically from input from Carol Picciolo