Future Collider Perspectives on Higgs CP Violation

TL;DR

This paper analyzes the potential of future colliders to detect new sources of CP violation in the gauge-Higgs sector, highlighting their superior sensitivity over the high-luminosity LHC in probing BSM physics related to matter-antimatter asymmetry.

Contribution

It provides a comprehensive assessment of how future electron-positron and proton-proton colliders can improve sensitivity to CP-violating interactions in the gauge-Higgs sector, guiding future collider planning.

Findings

Future colliders can improve sensitivity to CP violation by an order of magnitude.

They can directly probe dimension-six effective field theory operators.

Enhanced detection capabilities relate to matter-antimatter asymmetry.

Abstract

The search for new sources of CP violation is a cornerstone of the beyond the Standard Model phenomenology programme at the LHC and beyond. We provide a comprehensive analysis of such searches at a range of future facilities with the aim of informing the currently unfolding future collider roadmap. Focussing on new sources of CP violation specifically in the gauge-Higgs sector, we demonstrate the outstanding potential held by future electron-positron and proton-proton colliders to reveal and identify BSM physics with direct relevance for the observed matter-antimatter asymmetry. In particular, the future colliders will provide an order of magnitude improvement in sensitivity to anomalous CP-violating interactions induced by dimension-six effective field theory operators when compared to the high-luminosity LHC programme.