Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 30: Top Physics II (Properties)

T 30.5: Vortrag

Dienstag, 1. April 2025, 17:15–17:30, VG 1.103

Measurement of top quark CKM elements at FCC-ee — Sarah Alshamaily, Sofia Giappichini, Simon Keilbach, Jan Kieseler, Markus Klute, Matteo Presilla, and •Xunwu Zuo — KIT, Karlsruhe, Germany

The CKM matrix is a central piece for the understanding of electroweak physics. Particularly, the CKM element |Vts| is not directly measurable at tree level in current experiments in a precise manner. The current most precise value, indirectly determined via Bs meson mixing, is highly model-dependent and dominated by theory uncertainties. The FCC-ee experiment expects to produce 2M tt events with a very clean environment, providing an excellent opportunity to probe the |Vts| through t → W s decay directly and in a model-independent way. This contribution summarizes the recent study on the |Vts| measurement at FCC-ee and discuss its theory impacts.

Keywords: top; CKM; strange tagging; jet flavor; FCC