Description
The FCC-ee collider will deliver unparalleled sensitivity in Higgs boson decays, including couplings to quarks, gluons, and searches for invisible and rare decay modes. By employing advanced jet flavour tagging algorithms and exploiting a clean experimental environment, FCC-ee will measure the Higgs branching fractions to b, c, and gluon jets with sub-percent to few-percent accuracy. It will also provide stringent constraints on couplings to strange quarks and extremely rare or flavour-violating decays, improving current limits by one order of magnitude. Additionally, the FCC-ee will achieve exceptional sensitivity to invisible Higgs decays, with expected limits at the $10^{-4}$ level, thus probing possible dark matter candidates or new hidden sectors.
