Precise measurement of the top quark mass in dilepton decays using optimized neutrino weighting

TL;DR

This paper presents a highly precise measurement of the top quark mass in dilepton decay channels, utilizing optimized neutrino weighting and improved jet energy calibration to reduce uncertainties.

Contribution

It introduces an optimized neutrino weighting method and enhanced jet calibration techniques for more accurate top quark mass measurement.

Findings

Measured top quark mass: 173.32 GeV

Reduced statistical uncertainty through optimization

Lowered systematic uncertainty via improved jet calibration

Abstract

We measure the top quark mass in dilepton final states of top-antitop events in proton-antiproton collisions at sqrt(s) = 1.96 TeV, using data corresponding to an integrated luminosity of 9.7 fb^-1 at the Fermilab Tevatron Collider. The analysis features a comprehensive optimization of the neutrino weighting method to minimize the statistical uncertainties. We also improve the calibration of jet energies using the calibration determined in top-antitop to lepton+jets events, which reduces the otherwise limiting systematic uncertainty from the jet energy scale. The measured top quark mass is mt = 173.32 +/- 1.36(stat) +/- 0.85(syst) GeV.