Comparing 2HDM + scalar and pseudoscalar simplified models at LHC

Production of Scalar Higgs and Pseudoscalar Higgs in Multi-Higgs Doublet Models at γγ Colliders

We present the effects of heavy CP-even (H) and CP-odd (A) Higgs bosons on the production cross section of the process γγ → tt at the energy around the mass poles of the Higgs bosons. It is found that the interference between H and A with the small mass gap, as well as the ones between Higgs bosons and the continuum, contributes to the cross section, if the photon beams are polarized and if we ...

Production of Scalar and Pseudoscalar Higgs bosons at Muon colliders

In the s-channel Higgs-boson-exchange processes, the interference between the amplitudes for scalar and pseudoscalar Higgs bosons is sizable, if the helicities of initial and final particles are properly fixed and if the mass difference between these bosons is not much larger than their decay widths. We discuss this interference effect in the process μμ → tt. Examining the effects gives us an i...

Resonant CP-Violating Scalar–Pseudoscalar Transitions at μμ Colliders

A μμ collider is an appealing machine to probe resonant CP-violating transitions of a CP-even Higgs particle into the Z boson or into another CP-odd Higgs scalar. These phenomena are studied within a manifestly gauge-invariant approach implemented by the pinch technique. The CP invariance of an extended Higgs sector motivated by supersymmetric E6 models is assumed to be broken radiatively by th...

Comparing Selfinteracting Scalar Fields and Cosmological Models

We generalize the well-known analogies between m2φ2 and R+R2 theories to include the selfinteraction λφ4-term for the scalar field. It turns out to be the R + R3 Lagrangian which gives an appropriate model for it. Considering a spatially flat Friedman cosmological model, common and different properties of these models are discussed, e.g., by linearizing around a ground state the masses of the r...

2HDM Charged Higgs Boson Searches at the LHC: Status and Prospects