English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Studies of different properties of the top-antitop pairs in dileptonique final state are presented in this thesis. Two analyzes were conducted in different experiments: one to D0 at the Tevatron, the other in ATLAS at LHC. Both colliders are different, the measures undertaken are complementary to the top of the properties of the study. The first analysis, conducted in the D0 experiment was to make simultaneous measurements of the cross section for production of pairs of top-antitop and branching ratio t -> Wb This was carried out in the channel with a dileptonique batch of data corresponding to a brightness of 5.4 fb⁻¹. It was then combined with the measurement made in the semileptonique channel to obtain an accuracy of 8% over the cross section, comparable to the accuracy of theoretical calculations. The second analysis presented, conducted in the ATLAS experiment was to measure the top quark charge asymmetry in dileptonique channel with the data set recorded by ATLAS in 2011, or 4.7 fb⁻¹. The results were then combined with the results of semileptonique channel obtained with 1 fb⁻¹. We measure: AC (ttbar) = 0.029 ± 0.018 (stat.) ± 0.014 (syst.), Which is compatible with the standard model prediction ofmore » 0.004 ±- 0.001.« less

osti oai (u.s. department of energy office of scientific and technical information)

Étude dans les états finals dileptoniques de différentes propriétés des paires top-antitop avec les détecteurs D0 et ATLAS; Study in the final states dileptoniques different properties of top-antitop pairs with D0 and ATLAS detectors