New Tools for Dissecting the General 2HDM

Kavli Affiliate: Marcela Carena

| First 5 Authors: Henning Bahl, Marcela Carena, Nina M. Coyle, Aurora Ireland, Carlos E. M. Wagner

| Summary:

Two Higgs doublet models (2HDM) provide the low energy effective field theory
(EFT) description in many well motivated extensions of the Standard Model. It
is therefore relevant to study their properties, as well as the theoretical
constraints on these models. In this article we concentrate on three relevant
requirements for the validity of the 2HDM framework, namely the perturbative
unitarity bounds, the bounded from below constraints, and the vacuum stability
constraints. In this study, we concentrate on the most general renormalizable
version of the 2HDM — without imposing any parity symmetry, which may be
violated in many UV extensions. We derive novel analytical expressions that
generalize those previously obtained in more restrictive scenarios to the most
general case. We also discuss the phenomenological implications of these
bounds, focusing on CP violation.

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