Measurement of the top-quark mass in pp̄ collisions using events with two leptons

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Abazov, V. M.
Abbott, B.
Acharya, B. S.
Adams, M.
Adams, T.
Alexeev, G. D.
Alkhazov, G.
Alton, A.
Alverson, G.
Aoki, M.

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We present a measurement of the top-quark mass (m t) 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 m t=173.7±2.8(stat)±1.5(syst)GeV and combining with our analysis in 1fb -1 of preceding data we measure m t=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 m t=173.9±1.9(stat) ±1.6(syst)GeV. © 2012 American Physical Society.



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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 86, n. 5, 2012.