Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s)=1.96 TeV using Lepton + Jets Events with Lifetime b-tagging

TL;DR

This paper reports a measurement of the top quark pair production cross section in proton-antiproton collisions at 1.96 TeV, using lepton + jets events with lifetime-based b-tagging to improve purity, consistent with Standard Model predictions.

Contribution

It introduces a measurement of the $t\bar{t}$ cross section using lifetime-based b-tagging techniques in $p\bar{p}$ collisions at Fermilab Tevatron.

Findings

Measured $\sigma_{t\bar{t}}=8.6^{+1.6}_{-1.5}$(stat.+syst.)$\pm 0.6$(lumi.) pb

Results agree with Standard Model expectations

Used lifetime-based b-jet identification to enhance sample purity

Abstract

We present a measurement of the top quark pair ($t\bar{t}$) production cross section ($\sigma_{t\bar{t}}$) in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV using 230 pb$^{-1}$ of data collected by the D0 experiment at the Fermilab Tevatron Collider. We select events with one charged lepton (electron or muon), missing transverse energy, and jets in the final state. We employ lifetime-based b-jet identification techniques to further enhance the $t\bar{t}$ purity of the selected sample. For a top quark mass of 175 GeV, we measure $\sigma_{t\bar{t}}=8.6^{+1.6}_{-1.5}(stat.+syst.)\pm 0.6(lumi.)$ pb, in agreement with the standard model expectation.