Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 97: Future colliders

T 97.8: Talk

Thursday, March 7, 2024, 17:45–18:00, Geb. 30.34: LTI

Probe of top-quark electroweak couplings at the FCC-ee — •Simon Keilbach, Jan Kieseler, Markus Klute, Matteo Presilla, and Xunwu Zuo — KIT, Karlsruhe, Germany

The Future Circular Collider (FCC) is a post-LHC project aiming to provide unprecedented insights on both Standard Model physics and beyond, featuring electron-positron collisions (FCC-ee) as the first stage of the program. The FCC-ee operation includes a dataset with a collision energy of around 365 GeV, containing roughly 2 million instances of top-quark pair production. With such a clean collection of top quarks, we expect to enter a new era of top precision measurements, among which the top electroweak coupling parameters, especially the ttZ and ttgamma couplings, are of crucial importance. Traditional proposals for such measurements rely on beam polarization to disentangle the ttZ and ttgamma contributions. This talk reports a recent study at FCC-ee on the possibility of ttZ and ttgamma measurements with unpolarized incoming beams.

Keywords: FCC-ee; top physics; electroweak measurement