We report a measurement of the top quark mass M_t in the
dilepton decay channel t anti-t --> bl'+ nu'_l l- nu-bar_l. Events are
selected with a neural network which has been directly optimized for
statistical precision in top quark mass using neuroevolution, a technique
modeled on biological evolution. The top quark mass is extracted from
per-event probability densities that are formed by the convolution
of leading order matrix elements and detector resolution functions.
The joint probability is the product of the probability densities from 344
candidate events in 2.0 fb-1 of p anti-p collisions collected with the
CDF II detector, yielding a measurement of M-t ñ71.2 +/- 2.7(stat.) +/-
2.9(syst.) GeV/c2.
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Updated: Thursday, 2009 April 16 09:48:20 CDT automatically from input from carol picciolo