Combination of CDF and DO results on the mass of the top quark using up to 5.8~fb-1 of data

TL;DR

This paper combines top-quark mass measurements from CDF and DØ experiments at Fermilab, using data from 1992 to present, to provide a precise average mass estimate with improved accuracy.

Contribution

It presents a combined analysis of multiple measurements, including new analyses, to refine the top-quark mass estimate using up to 5.8 fb^-1 of data.

Findings

Preliminary Tevatron average top-quark mass is 173.2 GeV/c^2.

Uncertainty in the combined measurement is reduced to 0.9 GeV/c^2.

Inclusion of new analyses improves the precision of the top-quark mass estimate.

Abstract

We summarize the top-quark mass measurements from the CDF and DO experiments at Fermilab. We combine published Run I (1992--1996) measurements with the most precise published and preliminary Run II (2001-present) measurements using up to 5.8 fb-1 of data, adding new analyses (the Met+Jets analysis) and updating old ones. Taking uncertainty correlations into account, and adding in quadrature the statistical and systematic uncertainties, the resulting preliminary Tevatron average mass of the top quark is M_T=173.2+/-0.9 GeV/c^2.