Measurement of the Top-Antitop Production Cross Section at sqrt(s) = 1.96 TeV in the Combined Lepton+Track and e+mu Channel Using 370 pb^-1 of D0 Data

TL;DR

This paper reports a measurement of the top-antitop quark pair production cross section at 1.96 TeV using combined lepton+track and e+mu channels, utilizing 370 pb^-1 of D0 data, with improved selection efficiency.

Contribution

It introduces a novel lepton+track selection method combined with e+mu channel analysis to measure the ttbar cross section at the Tevatron.

Findings

Measured cross section: 8.6 pb with uncertainties

Combined analysis improves measurement accuracy

Results are consistent with Standard Model predictions

Abstract

A measurement of the ttbar production cross section at sqrt(s) = 1.96 TeV in the dilepton final states using a lepton+track selection and secondary vertex b-tagging is presented. One of the two leptons from the decay of the ttbar pair is allowed to be identified only as an isolated track to improve the selection efficiency. The result is combined with a measurement in the ttbar->e+mu final state. The measurements are based on 370 pb^-1 of data collected with the D0 experiment at the Tevatron collider. The preliminary cross section obtained in the combined lepton+track and e+mu channel is: sigma_{ttbar} = 8.6 +1.9 -1.7 (stat) +/- 1.1 (syst) +/- 0.6 (lumi) pb.