Measurement of the Top Quark Mass in the Dilepton Channel
B. Abbott
TL;DR
This paper reports a top-quark mass measurement in the dilepton ttbar channel using about 125 pb^-1 of data from the Fermilab Tevatron. The mass is extracted with maximum-likelihood fits to decay kinematics, yielding m_top = 168.4 ± 12.3 (stat) ± 3.6 (syst) GeV/c^2, and is combined with an earlier lepton+jets result to give m_top = 172.1 ± 7.1 GeV/c^2. The work tests SM predictions by constraining m_top through electroweak radiative corrections and contributes to the global top-quark mass profile relevant for Higgs-sector inferences.
Abstract
We report a measurement of the top quark mass using six candidate events for the process pbarp->ttbar->l^+ nu l^- nubar b bbar + X, observed in the D0 experiment at the Fermilab ppbar collider. Using maximum likelihood fits to the dynamics of the decays, we measure a mass for the top quark of m(top) = 168.4 +- 12.3 (stat) +- 3.6 (syst) GeV/c^2. We combine this result with our previous measurement in the ttbar->l+jets channel to obtain m(top) = 172.1 +- 7.1 GeV/c^2 as the best value of the mass of the top quark measured by D0.