“Phenomenology of a kinetic Higgs portal” investigates non-minimal Higgs portal interactions, focusing on momentum-dependent couplings between the Standard Model Higgs and a hidden scalar sector. Such “kinetic portals” naturally emerge in effective field theory frameworks and differ from the minimal, renormalisable Higgs portal by introducing non-decoupling effects, e.g. from strong interactions. We analyse collider implications, showing that invisible Higgs decay searches can lose sensitivity due to destructive interference, leaving viable parameter regions unconstrained. Indirect probes, particularly four-top production and precision Higgs coupling measurements, become key discovery channels, with additional though weaker sensitivity from Higgs and Z boson pair production. Extending beyond collider phenomenology, we explore cosmological consequences: the modified portal can alter the electroweak phase transition and provide a consistent dark matter relic abundance while evading direct detection limits. The authors conclude that HL-LHC measurements, and especially future Higgs factories such as FCC-ee, will be crucial to probing these scenarios. (Read more)