V-Associated Production & Vector Boson Fusion as an LHC Signature of CP Violation

TL;DR

This paper explores how vector boson fusion and associated production processes at the LHC can serve as signatures of CP violation in extended Higgs sectors, focusing on the complex two-Higgs-doublet-model.

Contribution

It proposes new signatures involving VBF and V-AP processes to detect CP violation in extended Higgs models at the LHC.

Findings

Resonant production of a new Higgs decaying into Z and 125 GeV Higgs as a CP violation signal.

Analysis of measurement prospects for CP violation at the High-Luminosity LHC.

Identification of signatures relying on V-AP/VBF processes to uncover CP violation.

Abstract

We investigate the role of vector boson fusion (VBF) and associated production with an electroweak boson (V-AP) of beyond-the-Standard-Model Higgses at the LHC in probing CP violation in extended Higgs sectors. Resonant production of a new Higgs boson through V-AP/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/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.