Unitarity Bound on Extended Higgs Sector with Higher Dimensional Operator

TL;DR

This paper investigates how higher dimensional operators in the two-Higgs-doublet model affect unitarity bounds and potentially enhance vector boson fusion cross-sections, providing new constraints on beyond Standard Model physics.

Contribution

It derives unitarity bounds for dim-6 operators in 2HDM and explores their impact on scalar production cross-sections in vector boson fusion.

Findings

Derived limits on bosonic operators up to dim-6 in 2HDM.

Identified potential for increased vector boson fusion cross-sections.

Established unitarity constraints ensuring theoretical consistency.

Abstract

We study the perturbative unitarity bound given by higher dimensional bosonic operators up to dim-6 for the two-Higgs-doublet model (2HDM). They lead to new physics beyond the Standard Model. We point out that such operators can lead to a larger cross-section in the vector boson fusion channels for the scalars, compared to the tree-level 2HDM. We have obtained limits on a few bosonic operators up to dim-6 for 2HDM, by ensuring unitarity of the S-matrix.