Heidelberg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

T: Fachverband Teilchenphysik

T 33: Top Quarks: Production (Exp.) 2

T 33.4: Vortrag

Dienstag, 22. März 2022, 17:00–17:15, T-H18

Measurement of the inclusive production cross sections of a top-quark pair in association with a Z boson at √s = 13 TeV in final states with three leptons using deep neural nets with the ATLAS detector — •Steffen Korn, Arnulf Quadt, and Elizaveta Shabalina — II. Physikalisches Institut, Georg-August-Universität Göttingen

Through the associated production of a top quark pair and a Z boson, the strength and structure of the neutral current weak coupling of the top quark and the Z boson can be measured. It provides sensitivity to the top quark’s weak isospin in the framework of the Standard Model (SM). The measurement of this fundamental parameter of the SM also serves as a probe to new physics beyond the SM. The process was measured by ATLAS and CMS at √s=13 TeV with the full run 2 data set. In a new, refined analysis multivariate techniques are used to improve the sensitivity of the measurement. The impact of the usage of multi-class deep neural network for event classification on the systematic uncertainties for a measurement of the inclusive cross section of ttZ final states with three charged leptons is presented.