Combination of CDF and D0 Results on the Top-Quark Mass
The CDF Collaboration, the D0 Collaboration, the Tevatron Electroweak Working Group
TL;DR
This work combines eight top-quark mass measurements from CDF and DØ across Tevatron Run I and Run II, carefully accounting for correlated systematic uncertainties, especially jet energy scale (JES), using chi-square/BLUE methods. The analysis yields a world-average top-quark mass of M_top = 172.7 ± 2.9 GeV/c^2 with a 1.7% relative precision, reflecting significant contributions from Run-II lepton+jets inputs. The results demonstrate good cross-channel consistency and highlight the impact of in-situ JES calibrations on reducing overall uncertainty. The study enhances the precision of the top-quark mass, tightening constraints on Standard Model parameters and Higgs sector implications.
Abstract
The results on the measurements of the top-quark mass, based on the data collected by the Tevatron experiments CDF and DØat Fermilab during {\RunI} from 1992 to 1996 and {\RunII} since 2001, are summarized. The combination of the published {\RunI} and preliminary {\RunII} results, taking correlated uncertainties properly into account, is presented. The resulting preliminary world average for the mass of the top quark is: $\MT=172.7\pm 2.9 \GeVc2$, where the total error consists of a statistical part of $1.7 \GeVc2$ and a systematic part of $2.4 \GeVc2$. Compared to the combination prepared for the LP 2005 conference, this combination for the EPS-HEP 2005 conference includes additional published {\RunI} and preliminary {\RunII} measurements.