Measurement of the top quark mass in the lepton+jets final state with the matrix element method

TL;DR

This paper measures the top quark mass using the Matrix Element method in lepton+jets events, incorporating a global jet energy scale factor to reduce systematic uncertainties, based on Fermilab Tevatron data.

Contribution

It introduces an extended likelihood approach that includes a jet energy scale parameter, improving the precision of top quark mass measurement.

Findings

Top quark mass measured as 169.2 GeV with topological info.

Including b-jet info yields a mass of 170.3 GeV.

Jet energy scale is consistent with the reference scale.

Abstract

We present a measurement of the top quark mass with the Matrix Element method in the lepton+jets final state. As the energy scale for calorimeter jets represents the dominant source of systematic uncertainty, the Matrix Element likelihood is extended by an additional parameter, which is defined as a global multiplicative factor applied to the standard energy scale. The top quark mass is obtained from a fit that yields the combined statistical and systematic jet energy scale uncertainty. Using a data set of 370 pb-1 taken with the D0 experiment at Run II of the Fermilab Tevatron Collider, the mass of the top quark is measured using topological information to be: mtop(topo) = 169.2 +5.0-7.4 (stat.+JES) +1.5-1.4 (syst.) GeV, and when information about identified $b$ jets is included: mtop(b-tag) = 170.3 +4.1-4.5 (stat.+JES) +1.2-1.8 (syst.) GeV. The measurements yield a jet energy scale consistent with the reference scale.