Measurement of the top quark mass using the matrix element analysis technique in the lepton + jets channel with in situ W calibration at CDF

We present a top quark mass measurement from $p\bar p$ collisions at CDF. We use events from $p\bar p$ to $t\bar t$ in the lepton+jets channel requiring one charged lepton, high missing transverse energy and at least 4 jets, at least one of which must be identified as a $b$-jet. The top quark mass is extracted with a 2D unbinned likelihood fit using per-event probabilities calculated using leading-order signal ($t\bar t$) and background ($W$+jets) matrix elements. The probabilities are a function of both the top quark mass and the energy scale of the calorimeter jets (JES) which is measured in-situ by constraining the invariant mass of two hadronic jets to the $W$ boson mass.