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T: Fachverband Teilchenphysik

T 28: Top quark production II

T 28.5: Vortrag

Dienstag, 16. März 2021, 17:00–17:15, Tc

Jet activity measurement in top pair productions in dilepton channel with the ATLAS experiment — •Matthieu Robin — DESY, Zeuthen

The subject of this talk is the tt + jets measurement with the ATLAS detector.

This measurement allows to challenge the understanding of physics phenomena described by a robust theory (QCD), thus providing the necessary feedback to theorists to fine-tune the approximations and parameters used to perform the simulations of these phenomena and continue to further improve the precision one can reach. Achieving precision is indeed important for other analyses regarding the understanding and rejection of their QCD background (e.g.: ttH(H→bb)).

This study uses the full LHC run II dataset of 139 fb⁻¹ to improve the results in statistically limited regions as well as method to better estimate and/or reject our signal backgrounds such as fake lepton background and pile-up jets. In this talk updated data/MC comparisons will be shown using updated b-tagging and jet reconstruction algorithms with some unfolded results and an emphasis on PU study that I performed with the help of the tt + jets analysis team of ATLAS.