A precision measurement of the top quark mass $m_t$ is obtained using a sample of $t\overline{t}$ events from $p\overline{p}$ collisions at the Fermilab Tevatron with the CDF II detector. Selected events require an electron or muon, large missing transverse energy, and exactly four high-energy jets, at least one of which is tagged as coming from a $b$ quark. A likelihood is calculated using a matrix element method with quasi-Monte Carlo integration taking into account finite detector resolution and jet mass effects. The event likelihood is a function of $m_t$ and a parameter ${\Delta }_{\mathrm{JES}}$ used to calibrate the jet energy scale in situ. Using a total of 1087 events in $5.6{\mathrm{fb}}^{-1}$ of integrated luminosity, a value of $m_t=173.0\pm 1.2\mathrm{GeV}/c^2$ is measured.

• Received 22 October 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.252001