Orateurs
Description
The Future Circular Collider (FCC-ee) is a proposed electron-positron collider designed to enable high-energy collisions at unmatched scales. It is expected to produce $O(10^{12})$ $Z \to q\bar{q}$ events, significantly enhancing our ability to perform precision measurements of electroweak observables. So far, LHCb has measured CP violation in $D^0$ decays to charged particles. Our understanding of CP violation in the charm sector can be further improved by studying the decay mode $D^0 \rightarrow \pi^0\pi^0$.
This talk presents a study focusing on the reconstruction of
$D^{*\pm}\rightarrow(D^0 \rightarrow \pi^0 (\rightarrow \gamma\gamma) + \pi^0 (\rightarrow \gamma\gamma))\pi^{\pm}$ decays at the FCC-ee to estimate the sensitivity to direct $C\!P$ violation 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 $C\!P$-Violating decay-rate asymmetry $A_{\text{$C!P$}}(D^0 \rightarrow \pi^0\pi^0)$. Furthermore, the reconstruction of this particular decay chain can serve as a benchmark for the electromagnetic calorimeter of future electron positron colliders like the FCC-ee, because the reconstruction of neutral pions $\pi^0$ is challenging, as identifying the two photons from a single decay requires high angular and energy resolution.
