Measurement of the Top Quark Mass Using Dilepton Events

TL;DR

This paper reports a measurement of the top quark mass using dilepton decay events from proton-antiproton collisions, achieving a combined value consistent with previous single-lepton measurements, with detailed statistical and systematic analysis.

Contribution

First measurement of the top quark mass using dilepton events at the Tevatron, providing an independent verification of previous results with a new decay channel.

Findings

Measured top quark mass: 168.4 GeV/c^2 with statistical and systematic uncertainties.

Combined top quark mass from dilepton and single-lepton channels: 172.0 GeV/c^2.

Results are consistent with earlier measurements, confirming the top quark mass estimate.

Abstract

The D0 collaboration has performed a measurement of the top quark mass based on six candidate events for the process t tbar -> b W+ bbar W-, where the W bosons decay to e nu or mu nu. This sample was collected during an exposure of the D0 detector to an integrated luminosity of 125 pb^-1 of sqrt(s)=1.8 TeV p-pbar collisions. We obtain mt = 168.4 +- 12.3 (stat) +- 3.7 (sys) GeV/c^2, consistent with the measurement obtained using single-lepton events. Combination of the single-lepton and dilepton results yields mt = 172.0 +- 7.5 GeV/c^2.