Charged-Higgs phenomenology in the Aligned two-Higgs-doublet model

TL;DR

This paper explores the phenomenology of charged Higgs bosons within the aligned two-Higgs-doublet model, analyzing their effects on flavor-changing processes and deriving constraints on model parameters.

Contribution

It provides a detailed analysis of charged Higgs effects in the aligned 2HDM and derives new phenomenological constraints based on flavor-changing processes.

Findings

Constraints on model parameters from flavor-changing processes

Identification of CP violation sources in the model

Implications for charged Higgs searches

Abstract

The alignment in flavour space of the Yukawa matrices of a general two-Higgs-doublet model results in the absence of tree-level flavour-changing neutral currents. In addition to the usual fermion masses and mixings, the aligned Yukawa structure only contains three complex parameters, which are potential new sources of CP violation. For particular values of these three parameters all known specific implementations of the model based on discrete Z_2 symmetries are recovered. One of the most distinctive features of the two-Higgs-doublet model is the presence of a charged scalar. In this work, we discuss its main phenomenological consequences in flavour-changing processes at low energies and derive the corresponding constraints on the parameters of the aligned two-Higgs-doublet model.