Measurement of Higgs boson hadronic decays at FCC-ee

The sensitivity of the measurement of the Higgs boson branching ratios to bb, cc, ss and gg final states with a modified version of the IDEA detector concept at the Future Circular Collider is studied using simulated event samples of the main  signal and background processes. The study assumes four identical detectors leading to an integrated luminosity of 10.8/ab e+e- collisions with a centre-of-mass energy sqrt(s)=240 GeV, and to an integrated luminosity of 3.0/ab of e+e- collisions with a centre-of-mass energy sqrt(s)=365 GeV. The signal consists mainly of ee -> ZH Higgs-strahlung events followed by one of the four Higgs boson decays under study. The study considers Z boson decays to pairs of leptons, either charged or neutral, or to a quark-antiquark pair. Vector boson fusion also contributes to the final states under study. Its impact is estimated separately from that of ZH events.