Measurement of the top quark mass in $\boldsymbol{\ppbar}$ collisions using events with two leptons

Abstract

We present a measurement of the top quark mass ($m_t$) in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using $t\bar{t}$ events with two leptons ($ee$, $e\mu$, or $\mu \mu$) and accompanying jets in $4.3f{b}^{-1}$ 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 $t\bar{t}$ 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 $m_t=173.7\pm 2.8(\mathrm{stat})\pm 1.5(\mathrm{syst})$ GeV and combining with our analysis in 1 fb${}^{-1}$ of preceding data we measure $m_t=174.0\pm 2.4(\mathrm{stat})\pm 1.4(\mathrm{syst})$ GeV. Taking into account statistical and systematic correlations, a combination with the D0 matrix element result from both data sets yields $m_t=173.9\pm 1.9(\mathrm{stat})\pm 1.6(\mathrm{syst})$ GeV.

5 pages, 1 figure, submitted to Phys. Rev. Letters

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• Precise measurement of the top quark mass in dilepton decays using optimized neutrino weighting
• Measurement of the Top Quark Mass Using the Matrix Element Technique in Dilepton Final States
• Measurement of the top-quark mass in the $t\bar{t}$ dilepton channel using the full CDF Run II data set
• Properties of the Top Quark
• Top Quark Physics at the Tevatron
• Review of recent measurements in the top quark sector at the Tevatron