Abstract
We present the most recent measurements of top quark pairs production and top quark properties in proton-antiproton collisions with center-of-mass energy of 1.96 TeV using CDF II detector at the Tevatron. The combination of top pair production cross section measurements and the direct measurement of top quark width are reported. The test of Standard Model predictions for top quark decaying into b-quarks, performed by measuring the ratio R between the top quark branching fraction to b-quark and the branching fraction to any type of down quark is shown. The extraction of the CKM matrix element |Vtb| from the ratio R is discussed. We also present the latest measurements on the forward-backward asymmetry (AFB) in top anti-top quark production. With the full CDF Run II data set, the measurements are performed in top anti-top decaying to final states that contain one or two charged leptons (electrons or muons). In addition, we combine the results of the leptonic forward-backward asymmetry in tt‾ system between the two final states. All the results show deviations from the next-to-leading order (NLO) standard model (SM) calculation.
Highlights
The top quark, discovered at the Tevatron in 1995 by CDF [1] and D0 [2] experiments, have completed the third generation of quarks in the standard model (SM) and been playing a special role with the heaviest known elementary particle in electroweak symmetry breaking
We present the latest measurements on the forward-backward asymmetry (AFB) in top anti-top quark production
The all hadronic decay channel has an advantage of the largest cross section but it suffers from a huge background from the quantum chromodynamics (QCD) multijet production and cannot be simulated with Monte Carlo sample
Summary
The top quark, discovered at the Tevatron in 1995 by CDF [1] and D0 [2] experiments, have completed the third generation of quarks in the SM and been playing a special role with the heaviest known elementary particle in electroweak symmetry breaking. This large mass is responsible for the top quark properties. The dilepton channel is only 5 percent of top quark pairs decay but it has the cleanest final state to identify because there is no so many other processes can produce such a striking final state even before requiring the identification of one of the jets originating from a b-quark (b-tagging). The all hadronic decay channel has an advantage of the largest cross section but it suffers from a huge background from the quantum chromodynamics (QCD) multijet production and cannot be simulated with Monte Carlo sample
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