SMuK 2023 – wissenschaftliches Programm

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

T: Fachverband Teilchenphysik

T 81: Single Top, Top Properties

T 81.6: Vortrag

Mittwoch, 22. März 2023, 18:45–19:00, HSZ/0103

Measurement of top quark involved CKM matrix elements in single top-quark t-channel processes — •Benedikt Gocke¹, Dominc Hirschbuel², Kevin Kröninger¹, Olaf Nackenhorst¹, Joshua Reidelstürz², Maren Stratmann², and Wolfgang Wagner² — ¹TU Dortmund, AG Kröninger — ²Bergische Universität Wuppertal

Measuring top quark properties is one of the main purposes of the ATLAS experiment at the LHC. Since the top quark is the heaviest quark and thus decays before it hadronises, it can be seen as a quasi free quark. Therefore, its properties and especially its couplings are crucial to test the Standard model.
In general, all flavour-changing quark couplings are described by the Cabbibo-Kobayashi-Maskawa (CKM) matrix. Furthermore, all CKM matrix elements are free parameters of the Standard model and thus need to be measured. For the three CKM matrix elements involved in top quark processes - V_tb, V_ts and V_td - this is especially challenging due to the very small magnitudes for the two latter ones.
The CKM interpretation of the single top-quark t-channel cross section measurement at √s=13 TeV with the ATLAS experiment is presented, in which all possible top quark production and decay processes are considered. The aim is to set limits on each involved CKM element individually for the first time. For this purpose, a profile-likelihood scan is used for the interpretation.