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Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 97: Future colliders

T 97.1: Talk

Thursday, March 7, 2024, 16:00–16:15, Geb. 30.34: LTI

Heavy-quark precision measurements at FCC-eeKevin Kröninger1, Romain Madar2, Stéphane Monteil2, and •Lars Röhrig1, 21TU Dortmund University, Department of Physics, Dortmund — 2Université Clermont-Auvergne, Laboratoire de Physique de Clermont, Clermont-Ferrand

The FCC-ee, proposed as the successor to the Large Hadron Collider, aims at electron-positron collisions in order to achieve unprecedented precision in the electroweak sectors, producing in particular about O(1012) Zqq events. This makes it possible to measure electroweak observables related to the Zbb coupling with a very high accurary. However, the accuracy of these measurements is expected to be limited by systematic uncertainties, primarily originating from events related to light-quark physics.

To enhance overall measurement precision, we introduce an ultra-pure b-flavour tagger. This tagger relies on exclusive b-hadron reconstruction to effectively eliminate background contributions. We evaluate its performance and discuss the remaining systematic uncertainties in the measurement of Rb = Γ(Zbb)/Γ(Zqq) and the b-quark forward-backward asymmetry AFBb.

These results are put in context alongside top-quark measurements at FCC-ee, allowing us to establish stringent constraints on dimension-6 operators within the SMEFT framework.

Keywords: FCC-ee; lepton collider; heavy quarks; EW precision measurements

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