Combination of CDF and D0 Results on the Mass of the Top Quark

TL;DR

This paper combines top-quark mass measurements from CDF and D0 experiments at Fermilab, resulting in a more precise world average with 1.3% uncertainty, improving our understanding of fundamental particle properties.

Contribution

It provides the first combined analysis of Run-I and Run-II data, yielding a more accurate top-quark mass estimate with proper treatment of correlated uncertainties.

Findings

World average top-quark mass: 172.5 GeV/c2

Total uncertainty reduced to 2.3 GeV/c2

Precision improved by 20% over previous estimates

Abstract

We summarize the top-quark mass measurements from the CDF and D0 experiments at Fermilab. We combine published Run-I (1992- 1996) measurements with the most recent preliminary Run-II (2001- present) measurements using up to 750/pb of data. Taking correlated uncertainties properly into account the resulting preliminary world average mass of the top quark is Mt=172.5 +/- 1.3(stat) +/- 1.9(syst) GeV/c2, which corresponds to a total uncertainty of 2.3 GeV/c2. The top-quark mass is now known with a precision of 1.3% - a 20% improvement relative to the previous combination.