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

Abstract

The alignment in flavour space of the Yukawa matrices of a general two-Higgsdoublet 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 ς f , which are potential new sources of CP violation [1]. 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 H ± . 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.

Flavour-changing top decays in the aligned two-Higgs-doublet model

“…For particular real values of these parameters, indicated in table 1, one recovers all different versions of the 2HDM with NFC. The Yukawa alignment condition is not stable against quantum corrections [7,13,48]. However, the flavour symmetries of the A2HDM constrain tightly the possible FCNC effects, keeping them well below present experimental bounds [7,[49][50][51][52].…”

“…Constraints on the A2HDM from flavour and collider data have been analyzed in refs. [13][14][15][16][17][18] and [19][20][21][22][23][24][25][26], respectively, extracting relevant bounds on the model parameters.…”

CP violating Two-Higgs-Doublet Model: constraints and LHC predictions

“…Recently, in [13][14][15][16] model-independent approaches to CPV 2HDMs have been presented using the CP-odd weak-basis invariants. Charged Higgs phenomenology in CPV 2HDMs has been considered in [17,[19][20][21][22][23]. Surviving regions of the parameter space passing all experimental constraints in CPV 2HDMs have been studied in [24][25][26][27][28] and in [29] with a focus on EW Baryogenesis.…”

Status of B to D(*) τ ν decays in two-Higgs-doublet models

“…The processes considered are listed in Table 2, a more detailed discussion of the results presented here can be found in Refs. [9,10].…”