Two Higgs Doublet Model, Standard Model-like Scenario and Resolving SM from 2HDM at Photon Colliders

TL;DR

This paper explores the Two Higgs Doublet Model (2HDM), identifying parameter ranges that naturally suppress CP violation and flavor-changing effects, and demonstrates how photon collider experiments can distinguish 2HDM from the Standard Model in a SM-like scenario.

Contribution

It provides a detailed analysis of 2HDM parameters compatible with a SM-like scenario and proposes photon collider processes as a method to differentiate 2HDM from the Standard Model.

Findings

Decoupling limit with heavy Higgses is unnatural in 2HDM.

Identifies parameter ranges consistent with a SM-like scenario.

Photon collider processes can distinguish 2HDM from SM.

Abstract

1. Discussing 2HDM and Higgs potential, we find the parameters range giving naturally weak effects of CP violation and Flavor Changing Neutral Currents. Within this approach, the widely discussed decoupling limit with heavy $H^\pm$, $H$ and $A$ corresponds to an unnatural set of 2HDM parameters. 2. We define the SM--like scenario as that in which after LHC and e^+e^- LC operations no visible deviations from the minimal SM will be found. We find all the parameter ranges of 2HDM compatible with this scenario. 3. We show that the study of Higgs boson production at Photon Colliders (processes $\gamma \gamma \to h$ and $e \gamma\to eh$) can help to distinguish minimal SM from 2HDM with natural set of parameters.