STUDIES OF HIGGS BOSON PROPERTIES IN FUTURE LHC RUNS (SNOWMASS & ECFA STUDIES)

This presentation discusses the prospects for measurement (with the ATLAS and CMS detectors) of the Higgs boson quantum numbers, its self-coupling, couplings to gauge bosons and fermions, possible CP-mixing in the Higgs sector and also prospects of searching for rare Higgs boson decays and additional BSM Higgs bosons in future LHC runs with $300 fb^{-1}$ and $3000 fb^{-1}$ of integrated luminosity.