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

TL;DR

This work combines multiple CDF and DØ measurements of the top-quark mass from Run I and Run II, using a rigorous correlation-aware framework to produce a world-average value. The analysis incorporates detailed error categorization and correlations, including in-situ jet energy scale calibrations and a novel lxy-based method that largely bypasses JES. The resulting world-average mass is Mt = 170.9 ± 1.8 GeV/c^2, achieving about 1.1% relative precision; the result is consistent across all channels. The study highlights JES as the dominant systematic and outlines expectations for further improvement with larger Run-II data and refined modeling.

Abstract

We summarize the top-quark mass measurements from the CDF and D0 experiments at Fermilab. We combine published Run-I measurements with the most recent Run-II measurements. Taking correlated uncertainties into account the resulting preliminary world average top-quark mass is Mt=170.9+/-1.1(sta)+/-1.5(sys) GeV/c2 assuming Gaussian systematic uncertainties. Adding in quadrature yields a total uncertainty of 1.8 GeV/c2, corresponding to a relative precision of 1.1% on the mass of the top quark.

Figures (1)

• Figure 1: A summary of the input measurements and resulting world average mass of the top quark.