We present measurements of the top quark mass using the
m_T2, a variable related to the transverse mass in events with two
missing particles. We use the template method applied to t anti-t
dilepton events produced in p anti-p collisions at Fermilab's Tevatron
and collected by the CDF detector. From a data sample corresponding to
an integrated luminosity of 3.4 fb-1, we select 236 t anti-t candidate
events. Using the m_T2 distribution, we measure the top quark mass to
be M_top ñ68.0+4.8_-4.0 (stat.) +/- 2.9 (syst.) GeV/c2. By combining
the m_T2 with the reconstructed top mass distributions based on a
neutrino weighting method, we measure M_top ñ69.3 +/- 2.7 (stat.) +/-
3.2 (syst.) GeV/c2. This is the first application of the m_T2 variable
in a mass measurement at a hadron collider.
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Updated: Tuesday, 2010 February 16 14:51:39 CST automatically from input from carol picciolo