Measurements of top-quark properties at the Tevatron

5th International Workshop on Top Quark Physics

Jung, Andreas Werner^1

Fermilab, MS 357, PO Box 500, Batavia, 60510, IL, United States^1

关键词: Branching fractions;    Lorentz invariance violation;    Measurements of;    New physics;    Standard model;    The standard model;    Time dependency;    Top quarks;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/452/1/012035/pdf
DOI  :  10.1088/1742-6596/452/1/012035

来源: IOP

【 摘 要 】

Recent measurements of top-quark properties at the Tevatron are presented. CDF uses data corresponding up to 9.0 fb-1to measure the ratio R of the branching fractions , the branching fraction for top-quarks decaying into τ leptons and the cross section for the production of an additional γ in t production. The results from all these measurements agree well with their respective Standard Model expectation. DØ uses 5.3 fb-1of data to measure the 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 DØ sets first limits in the top-quark sector for Lorentz invariance violation. DØ also determines indirectly the top quark width using the results of earlier measurements at DØ. The measured top quark width is in agreement with the SM expectation and does not show any hints for new physics contributions.