Abstract
We discuss the search for a CP-odd scalar decaying into gauge bosons in the framework of a CP-conserving two-Higgs doublet model (2HDM) and of a 2HDM extended with a vector-like quark (VLQ) at the Large Hadron Collider and at a future 100 TeV collider. The rate of decay of a pseudoscalar to $Z$-bosons could be important to ascertain the CP-nature of the scalars in the model. In the 2HDM $A \to ZZ$ will be extremely hard to detect even at a future 100 TeV $pp$ collider while in the 2HDM+VLQ this decay can be probed even during the present LHC run. We further discuss all decays of the pseudoscalar into gauge bosons at the LHC and at a future 100 TeV collider in the alignment limit where the lightest scalar is the 125 GeV Higgs with SM-like couplings to the fermions and gauge bosons.
Highlights
We discuss the search for a CP-odd scalar decaying into gauge bosons in the frameworks of a CP-conserving two-Higgs doublet model (2HDM) and of a 2HDM extended with a vectorlike quark (VLQ) at the Large Hadron Collider and at a future 100 TeV collider
After the discovery of the Higgs boson by the ATLAS [1] and CMS [2] Collaborations at the Large Hadron Collider (LHC), the high-energy physics community focused on the search for signs of extended scalar sectors [3]
Finding a new scalar would be a clear signal of beyond the standard model (BSM) physics with extended Higgs sectors
Summary
After the discovery of the Higgs boson by the ATLAS [1] and CMS [2] Collaborations at the Large Hadron Collider (LHC), the high-energy physics community focused on the search for signs of extended scalar sectors [3]. The structure of the off-shell ZÃZZ vertex, has terms that are only nonzero if CP violation is present in the model This was calculated for the particular case of a complex version of the 2HDM (the C2HDM) [22,23] (see [24] for a recent review on the C2HDM) and for an extension of the 2HDM with an extra singlet where CP violation only exists in the dark scalar sector [25] and looking for the three decays that compose the one-loop contribution to ZÃZZ is not an option.
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