• Rapid Communication

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

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. D 86, 051103(R) – Published 26 September 2012

Abstract

We present a measurement of the top-quark mass (mt) in pp¯ collisions at s=1.96TeV using tt¯ events with two leptons (ee, eμ, or μμ) and accompanying jets in 4.3fb1 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 tt¯ 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 1fb1 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.

  • Figure
  • Received 24 January 2012

DOI:https://doi.org/10.1103/PhysRevD.86.051103

© 2012 American Physical Society

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Vol. 86, Iss. 5 — 1 September 2012

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