Measurement of the Top Quark and W Boson Masses

TL;DR

This paper reports precise measurements of the top quark and W boson masses using proton-antiproton collision data, employing various analysis methods, and discusses implications for the Higgs boson mass.

Contribution

It presents new combined measurements of the top quark and W boson masses with improved systematic uncertainty handling and methodological approaches.

Findings

Top quark mass: 173.1 ± 1.2 GeV

W boson mass: 80.401 ± 0.043 GeV

Higgs mass upper limit: 163 GeV at 95% CL

Abstract

We measure the top quark mass in top-antitop events using up to 3.6 /fb of proton-antiproton collisions at sqrt{s}=2 TeV. New results are described for matrix element methods with single lepton and dilepton channels, and template methods with all-jets and dilepton channels. Standardization of systematic uncertainties has proceeded between the CDF and D0 collaborations. A combined measurement of 173.1+/-0.6(stat)+/-1.1(syst) GeV is achieved. Fits to all measured electroweak parameters gives a Higgs boson mass 95% CL upper limit of m_H < 163 GeV. We also present a new measurement of the W boson mass from D0. Three different template methods are performed. Accounting for their correlations, a combined measurement of M_W=80.401+/-0.043(stat+syst) GeV is obtained.