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V-associated production and vector boson fusion as an LHC signature of CP violation

R. Capucha1,*, Á. Lozano-Onrubia2,3,†, L. Merlo2,3,‡, J. M. No2,3,§, and R. Santos1,4,∥

  • *Contact author: rscapucha@fc.ul.pt
  • †Contact author: alvaro.lozano.onrubia@csic.es
  • ‡Contact author: luca.merlo@uam.es
  • §Contact author: josemiguel.no@uam.es
  • ∥Contact author: rasantos@fc.ul.pt
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Phys. Rev. D 112, 095005 – Published 7 November, 2025

DOI: https://doi.org/10.1103/3s5k-h11w

Abstract

We investigate the role of vector boson fusion (VBF) and associated production with an electroweak boson (V-AP) of beyond-the-Standard-Model Higgs bosons at the LHC in probing CP violation in extended Higgs sectors. Resonant production of a new Higgs boson through V-AP and VBF subsequently decaying into a Z boson and a 125 GeV Higgs boson h would be a robust sign of CP violation, since h has been measured to be (predominantly) a CP-even state. After identifying this and other sets of signatures which rely on V-AP and VBF to jointly uncover CP violation, we analyze the prospects to measure CP violation in this way for the complex two-Higgs-doublet model at the High-Luminosity LHC.

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Phys. Rev. D 112, 095005– Published 7 November, 2025
  • Received 18 July 2025
  • Accepted 13 October 2025
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