Measurement of the ttbar Production Cross Section in ppbar collisions at sqrt{s} = 1.96 TeV using Lepton+Jets Events with Jet Probability b-tagging

TL;DR

This paper reports a measurement of the top-antitop quark pair production cross section in proton-antiproton collisions at 1.96 TeV using lepton+jets events with b-tagging, providing results consistent with previous measurements.

Contribution

First measurement of ttbar cross section using a b-tagging algorithm based on displaced track probabilities at Tevatron energies.

Findings

Measured cross section: 8.9 pb with uncertainties

Used 318 pb^{-1} of data from CDF II detector

Results consistent with other CDF measurements

Abstract

We present a measurement of the ttbar production cross section using events with one charged lepton and jets from ppbar collisions at a center-of-mass energy of 1.96 TeV. A b-tagging algorithm based on the probability of displaced tracks coming from the event interaction vertex is applied to identify b quarks from top decay. Using 318 pb^{-1} of data collected with the CDF II detector, we measure the ttbar production cross section in events with at least one restrictive (tight) b-tagged jet and obtain 8.9 +1.0-1.0 (stat.) +1.1-1.0 (syst.) pb. The cross section value assumes a top quark mass of m_{t}=178 GeV in the acceptance corrections. The dependence of the cross section on m_t is presented in the paper. This result is consistent with other CDF measurements of the ttbar cross section using different samples and analysis techniques, and has similar systematic uncertainties. We have also performed consistency checks by using the b-tagging probability function to vary the signal to background ratio and also using events that have at least two b-tagged jets.