  High-energy collider physics in the next decade will be dominated by the LHC,
whose high-luminosity incarnation will take Higgs measurements and new particle
searches to the next level. Several high-energy e+ e- colliders are being
proposed, including the ILC (the most mature), CLIC (the highest energy) and
the large circular colliders FCC-ee and CEPC (the highest luminosities for ZH
production, Z pole and W+ W- threshold studies), and the latter have synergies
with the 100-TeV pp collider options for the same tunnels (FCC-hh and SppC).
The Higgs, the Standard Model effective field theory, dark matter and
supersymmetry will be used to illustrate some of these colliders' capabilities.
Large circular colliders appear the most versatile, able to explore the 10-TeV
scale both directly in pp collisions and indirectly via precision measurements
in e+ e- collisions.
