Erlangen 2026 – scientific programme

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T: Fachverband Teilchenphysik

T 72: Flavour Physics IV

T 72.5: Talk

Thursday, March 19, 2026, 17:15–17:30, KH 01.011

FCC-ee Sensitivity Estimation to the Direct CP-Violating Decay-Rate Asymmetry A_CP(D⁰ → π⁰π⁰) — •Willy Weber^{1, 2}, Kevin Kröninger¹, Romain Madar², and Stéphane Monteil² — ¹TU Dortmund University, Department of Physics, Dortmund — ²Université Clermont-Auvergne, Laboratoire de Physique de Clermont, Clermont-Ferrand

The Future Circular Collider (FCC-ee) is a proposed electron-positron collider designed to enable high-energy collisions. It is expected to produce O(10¹²) Z → qq events, significantly enhancing our ability to perform precision measurements of electroweak observables.

CP violation in D⁰ decays to charged particles has been observed by LHCb. Our understanding of CP violation in the charm sector can be further improved by studying the decays into neutral particles. This presentation considers the potential for precise measurement of CP violation in D^*±→(D⁰ → π⁰ (→ γγ) + π⁰ (→ γγ))π^± decays at FCC-ee to complement the knowledge gathered by LHCb with charged modes. Monte Carlo samples, including a simulated detector response based on the IDEA detector concept, are used for this purpose. It is demonstrated that the FCC-ee will significantly improve the precision of the measurement of the CP-Violating decay-rate asymmetry A_CP(D⁰ → π⁰π⁰). Furthermore, the necessary detector requirements for this future measurement are investigated.

Keywords: FCC-ee; lepton collider; precision measurement; CP violation; charm