Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 75: Higgs Physics VII
T 75.6: Talk
Thursday, March 19, 2026, 17:30–17:45, KH 01.019
Probing Strong First-Order Electroweak Phase Transition scenarios in 2HDM with FCC-ee/CEPC — •Anisha Anisha1,2, Francisco Arco3, Stefano Di Noi1, Christoph Englert4, and Margarete Mühlleitner1 — 1Institute for Theoretical Physics, Karlsruhe Institute of Technology (KIT), Wolfgang-Gaede Straße 1, D-76131, Karlsruhe, Germany — 2Institute for Astroparticle Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, D-76344, Eggenstein-Leopoldshafen, Germany — 3Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, D-22607 Hamburg, Germany — 4Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
We investigate the potential of future electron-positron colliders, such as FCC-ee and CEPC, to probe 2-Higgs-doublet models (2HDMs) that facilitate a strong first-order electroweak phase transition (SFOEWPT), a necessary condition for electroweak baryogenesis. Focusing on a 2HDM in the CP-conserving limit, we identify parameter regions consistent with an SFOEWPT and evaluate their compatibility with projected precision electroweak and Higgs measurements, as well as searches for exotic Higgs bosons. We show that radiative corrections to e+e−→ hZ production introduce deviations in the cross section that are resolvable with the anticipated sub-percent precision at lepton colliders even when experimental outcomes of the LHC and Z pole measurements are in agreement with the SM. This underscores the opportunities of a precision lepton collider to explore BSM quantum corrections to the Higgs sector more broadly.
Keywords: Strong First-Order Electroweak Phase Transition; Future electron-positron colliders; Precision electroweak measurements; Higgs-Strahlung (hZ production); one-loop electroweak corrections