Measurement of the ppbar to ttbar production cross section at sqrt(s)=1.96 TeV in the fully hadronic decay channel

TL;DR

This paper reports a measurement of the top quark pair production cross section in proton-antiproton collisions at 1.96 TeV, focusing on fully hadronic decay channels using advanced tagging and neural network techniques.

Contribution

It presents a novel measurement of the ttbar cross section in the fully hadronic channel at the Tevatron with detailed background suppression methods.

Findings

Measured cross section: 4.5 pb with uncertainties

Used secondary vertex tagging and neural networks for background rejection

Results consistent with Standard Model predictions

Abstract

A measurement of the top quark pair production cross section in proton anti-proton collisions at an interaction energy of sqrt(s)=1.96 TeV is presented. This analysis uses 405 pb-1 of data collected with the D0 detector at the Fermilab Tevatron Collider. Fully hadronic ttbar decays with final states of six or more jets are separated from the multijet background using secondary vertex tagging and a neural network. The ttbar cross section is measured as sigma(ttbar)=4.5 -1.9 +2.0 (stat) -1.1 +1.4 (syst) +/- 0.3 (lumi) pb for a top quark mass of m(t) = 175 GeV/c^2.