We present a measurement of the top-quark mass (mt) in pp̄ collisions at s=1.96TeV using tt̄ events with two leptons (ee, eμ, or μμ) and accompanying jets in 4.3fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. We analyze the kinematically underconstrained dilepton events by integrating over their neutrino rapidity distributions. We reduce the dominant systematic uncertainties from the calibration of jet energy using a correction obtained from tt̄ events with a final state of a single lepton plus jets. We also correct jets in simulated events to replicate the quark flavor dependence of the jet response in data. We measure mt=173.7±2.8(stat)±1.5(syst)GeV and combining with our analysis in 1fb-1 of preceding data we measure mt=174.0±2.4(stat)±1.4(syst)GeV. Taking into account statistical and systematic correlations, a combination with the D0 matrix element result from both data sets yields mt=173.9±1.9(stat)±1.6(syst)GeV.
Physical Review D
- Pub Date:
- September 2012
- Top quarks;
- Quark and lepton masses and mixing;
- High Energy Physics - Experiment
- 5 pages, 1 figure, submitted to Phys. Rev. Letters