Top Quark Mass Measurement in Lepton+Jets Channel Using a Matrix Element Method

We present a measurement of the mass of the top quark from $p\bar p$ to $t\bar t$ events in the lepton plus jets channel. We use events from 681 pb$^{-1}$ of data from collisions at 1.96 TeV observed with the Collider Detector at Fermilab (CDF). The largest systematic uncertainty is convoluted with the statistical error using an in-situ measurement of the hadronic W boson mass. A likelihood is calculated for each event using a leading-order $t\bar t$ and W+jets cross-section, and parameterized parton showering. The final measured top quark mass and JES systematic is extracted from a joint likelihood of the product of the individual event likelihoods.