Speaker
Description
The Future Circular Collider (FCC) is a post-LHC project aimed at precision tests of the Standard Model and searches for new physics, on a new 91 km tunnel at CERN. At FCC-ee, the production of $\mathcal{O}(8\times10^{12})$ Z bosons will yield unprecedented samples of beauty and charm hadrons, exceeding those of Belle II by a factor of 20 and providing strong complementarity with the LHC heavy-flavour program. This dataset enables a broad flavour-physics program, including spectroscopy, precision studies of rare decays, and searches for CP violation. These measurements benefit from the clean experimental environment of $e^+e^-$ collisions, the large Lorentz boost of the produced hadrons, and access to the full spectrum of heavy-hadron species. In addition, tau-pair production during the Tera-Z phase will exceed Belle II yields by a factor of three. Combined with improved experimental conditions--better tau–hadron separation, clearer hemisphere definition, and higher track momenta--significant improvements in measurements of tau properties, including lifetime, mass, and leptonic and hadronic widths, are expected providing stringent tests of lepton universality. Searches for lepton-flavour-violating tau decays can be substantially extended, and precise measurements of tau polarisation will enable accurate determinations of neutral-current couplings. Exploiting statistical uncertainties at the $10^{-6}$ level poses demanding detector requirements.
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