Precise measurement of the top quark mass from lepton+jets events at D0

TL;DR

This paper presents a precise measurement of the top quark mass using lepton+jets events at D0, employing a likelihood method that minimizes jet energy scale uncertainties, resulting in a top mass of 171.5 GeV.

Contribution

The study introduces a likelihood technique that combines in-situ jet energy calibration with external constraints to improve top quark mass measurement accuracy.

Findings

Top quark mass measured as 171.5 GeV

Jet energy scale uncertainty significantly reduced

Measurement achieved with 1 fb-1 data

Abstract

We measure the mass of the top quark using top quark pair candidate events in the lepton+jets channel from data corresponding to 1 fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron collider. We use a likelihood technique that reduces the jet energy scale uncertainty by combining an in-situ jet energy calibration with the independent constraint on the jet energy scale (JES) from the calibration derived using photon+jets and dijet samples. We find the mass of the top quark to be 171.5+-1.8(stat.+JES)+-1.1(syst.) GeV.