Measurement of the p anti-p to t anti-t Production Cross Section and the Top Quark Mass at sqrt{s}=1.96 TeV in the All-Hadronic Decay Mode

TL;DR

This paper reports measurements of the top-antitop production cross section and top quark mass using proton-antiproton collision data at 1.96 TeV, employing neural networks and b-jet identification techniques.

Contribution

It presents a novel measurement of the top quark properties in the all-hadronic decay mode with a neural network-based event selection and b-jet tagging.

Findings

Measured cross section: 8.3+-1.0(stat)+2.0-1.5(syst)+-0.5(lumi) pb

Top quark mass: 174.0+-2.2(stat)+-4.8(syst) GeV/c^2

Results are consistent with the Standard Model predictions.

Abstract

We report the measurements of the t anti-t production cross section and of the top quark mass using 1.02 fb^-1 of p anti-p data collected with the CDFII detector at the Fermilab Tevatron. We select events with six or more jets on which a number of kinematical requirements are imposed by means of a neural network algorithm. At least one of these jets must be identified as initiated by a b-quark candidate by the reconstruction of a secondary vertex. The cross section is measured to be sigma_{tt}=8.3+-1.0(stat.)+2.0-1.5(syst.)+-0.5(lumi.) pb, which is consistent with the standard model prediction. The top quark mass of 174.0+-2.2(stat.)+-4.8(syst.) GeV/c^2 is derived from a likelihood fit incorporating reconstructed mass distributions representative of signal and background.