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T: Fachverband Teilchenphysik

T 89: Higgs Physics IX

T 89.6: Talk

Friday, March 20, 2026, 10:15–10:30, KH 00.014

Study of CP-violation in extended Higgs sectors at a Gamma-Gamma collider — •Muriel Blenck¹, Gudrid Moortgat-Pick^1,2, Marten Berger¹, and Ayoade Sotona¹ — ¹II. Institut für Theoretische Physik, Universität Hamburg, Luruper Chaussee 149, Hamburg — ²Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, Hamburg

A γγ collider offers a rich Higgs physics program at relatively low center of mass energies. The polarisation of the photon beams, which are obtained via Compton backscattering, are controlled by the incident laser and can reach high levels. This allows the study of CP-violating effects in extended Higgs sectors by constructing CP-odd observables that have higher sensitivity to CP-violating effects when transverse or longitudinal polarisation is used. The SM predicts the Higgs boson to be scalar-even particle, but BSM models like the 2HDM and 2HDMS allow an admixture of CP-even and CP-odd states, which could introduce additional CP-violating effects that would help explain the large baryon-antibaryon asyymetry in the universe. In this talk we present the possibility to use a γγ collider to measure these effects and determine the CP-mixing angle in the extended Higgs sectors.

Keywords: Photon collider; Higgs CP-properties; 2HDM