High energy lepton colliders as the ultimate Higgs microscopes

Abstract

We study standard electroweak/Higgs processes at the high-energy lepton colliders ILC and CLIC. We identify a subset of three operators in the SMEFT that give leading contributions to these processes at high energies. We then perform a `high-energy fit' including these operators. Our final bounds surpass existing LEP bounds and HL-LHC projections by orders of magnitude. Furthermore, we find that these colliders can probe scales up to tens of TeV, corresponding to the highest scales explored in electroweak/Higgs physics.

arXiv commentv3: 25 pages, 8 figures, 5 tables, minor changes, conclusions unchanged; version accepted for publication in JHEP

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