On the phenomenology of a two-Higgs-doublet model with maximal CP symmetry at the LHC

TL;DR

This paper explores a maximally-CP-symmetric two-Higgs-doublet model predicting specific Higgs boson production and decay patterns at the LHC, with fixed couplings leading to testable experimental signatures.

Contribution

It introduces a maximally-CP-symmetric two-Higgs-doublet model with fixed Higgs-fermion couplings, providing clear LHC predictions for Higgs production and decay.

Findings

Large cross sections for Higgs production via Drell-Yan processes

Fermion mass hierarchy emerges from electroweak symmetry breaking

Model's predictions are testable at the LHC

Abstract

Predictions for LHC physics are worked out for a two-Higgs-doublet model having four generalized CP symmetries. In this maximally-CP-symmetric model (MCPM) the first fermion family is, at tree level, uncoupled to the Higgs fields and thus massless. The second and third fermion families have a very symmetric coupling to the Higgs fields. But through the electroweak symmetry breaking a large mass hierarchy is generated between these fermion families. Thus, the fermion mass spectrum of the model presents a rough approximation to what is observed in Nature. In the MCPM there are, as in every two-Higgs-doublet model, five physical Higgs bosons, three neutral ones and a charged pair. In the MCPM the couplings of the Higgs bosons to the fermions are completely fixed. This allows us to present clear predictions for the production at the LHC and for the decays of the physical Higgs bosons. As salient feature we find rather large cross sections for Higgs-boson production via Drell-Yan type processes. With experiments at the LHC it should be possible to check these predictions.