Top Mass Measurements at the Tevatron Run II

Abstract

The latest top quark mass measurements by the CDF and D\O~ experiments are presented here. The mass has been determined in the dilepton ($\ttbar \to e\mu,ee,\mu\mu$ + jets +$\met$) and lepton plus jets ($\ttbar \to e$ or $\mu$ + jets +$\met$) final states. The most accurate single result from lepton plus jets channel is 173.5$^{+3.7}_{-3.6}$(stat. + Jet Energy Scale Systematic)$\pm1.3$(syst.) ~GeV/c$^{2}$, which is better than the combined CDF and D\O~ Run~I average. A preliminary and unofficial average of the best experimental Run~II results gives $M_{top}$ = $172.7\pm3.5$ GeV/c${^2}$.