We present a measurement of the tt-bar production cross section
using events with one charged lepton and jets from p anti-p 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 tt-bar 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/c2 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 tt-bar 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.
Return to top of page.
Go to Physics Results
Updated: Tuesday, 2006 October 17 15:37:07 CDT automatically from input from Carol Picciolo