Speaker
Description
The CERN proposed $e^-e^-$ Future Circular Collider (FCC-ee) is designed as an electroweak, Higgs and top factory, with unprecedented luminosities. Numerous measurements at the FCC-ee will rely on the precise determination of the primary and secondary vertices, measured by dedicated vertex detectors.
Within the FCC feasibility study performed to-date, all the vertex detectors designs are based on using Monolithic Active Pixel Sensors (MAPS) with a single-hit resolution of $\approx 3 \mu m$ and a material budget as low as $0.3\% X/X_0$ per detection layer, which is within specifications for the vast majority of the physics analyses.
This contribution presents the status of the full engineered version of the vertex detectors, including its integration with the collider beam pipe and discusses their predicted performance. A discussion of the challenges toward an ultra-light vertex detector using curved wafer-scale MAPS is also presented, which would allow to reduce the material budget to nearly one fifth, thus improving the vertexing capabilities especially for heavy flavours decays, such as $B^0 \rightarrow D^{*0} \tau^+ \tau^-$.
