Measurements of top-quark properties at the Tevatron

Abstract

Recent measurements of top-quark properties at the Tevatron are presented. CDF uses data corresponding up to 9.0 fb^{-1} to measure the ratio R of the branching fractions B(t \rightarrow Wb) / B(t \rightarrow Wq), the branching fraction for top-quarks decaying into τleptons and the cross section for the production of an additional γin t\bar{t} production. The results from all these measurements agree well with their respective Standard Model expectation. D0 uses 5.3 fb^{-1} of data to measure the t\bar{t} cross section as a function of the time. A time dependency would imply Lorentz invariance violation as implemented by the Standard Model extension. No time dependency is observed and D0 sets first limits in the top-quark sector for Lorentz invariance violation. D0 also determines indirectly the top quark width using the results of earlier measurements at D0. The measured top quark width is in agreement with the SM expectation and does not show any hints for new physics contributions.

5 pages, 5 figures, To appear in Proceedings of Top 2012

References in corpus (4)

• An improved determination of the width of the top quark
• Measurements of single top quark production cross sections and |Vtb| in ppbar collisions at sqrt{s}=1.96 TeV
• Search for violation of Lorentz invariance in top quark pair production and decay
• Evidence for t\bar{t}γProduction and Measurement of σ_t\bar{t}γ/ σ_t\bar{t}