Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 89: Higgs Physics IX
T 89.4: Talk
Friday, March 20, 2026, 09:45–10:00, KH 00.014
Future collider perspective on Higgs CP violation — •Yuyang Zhang1,3, Aidan Robson1, Christoph Englert2, Andrew Pilkington2, Jay Nesbitt1, Jenny List3, and Junping Tian4 — 1U of Glasgow, Glasgow, UK — 2U of Manchester, Manchester, UK — 3DESY, Hamburg, Germany — 4U of Tokyo, Tokyo, Japan
Future Higgs factories based on electron-positron colliders are expected to provide unprecedented precision in the measurement of Higgs boson properties, offering a new window for the discovery of physics beyond the Standard Model. In particular, the observation of CP-violation in Higgs interactions would serve as an important indication for electroweak baryogenesis.
In this work, we study the sensitivity to CP-violating Higgs couplings at future Higgs factories within the framework of the SM Effective Field Theory. We focus on Higgs production via the Higgsstrahlung process at √s=250 GeV and top-quark-associated Higgs production at √s=550 GeV at a linear collider facility with polarised beams.
The introduction of machine-learning techniques benefits the analysis in two ways. By constructing observables to discriminate between the CP-even and CP-odd contributions we demonstrate that the interference introduced by dimension-six operators can lead to sensitivity to CP-violating Higgs interactions. We also enhance sensitivity through improved reconstruction techniques. The use of polarised beams further increases the CP-sensitive interference contributions. Overall, the sensitivity obtained at a linear collider becomes comparable to that expected at circular colliders with higher luminosity.
Keywords: Higgs; CP-violation; LCF; ML