A private SUSY 4HDM with FCNC in the up-sector

Abstract

We present a SUSY model with four Higgs doublets of the "private type," in which all fermion types (up, down, and charged leptons) obtain their masses from a different Higgs doublet . The conditions for anomaly cancellation imply that the remaining Higgs doublet of the model ( ) must have the same hypercharge as , and thus, can only couple to up-type quarks, which opens the possibility to have FCNCs only in this sector. We study the Lagrangian of the model, and in particular, the Higgs potential, to identify the Higgs mass-eigenstates and their interactions; for the Yukawa matrices, we consider the four-texture case. We obtain constraints on the model parameters by using LHC measurements on the properties of the 125 GeV Higgs boson (h), and identify viable regions of the parameter space. Subsequently, these constraints are used to evaluate the prospects for detecting the FCNC decay mode at the future high-luminosity (HL) option for the LHC, which are compared with current limits from LHC-run2. Moreover, we evaluate the FCNC decay of the next heavier Higgs boson , which can typically reach . The search for the signal at HL-LHC is also studied, and it is found that it may be detectable for specific regions of the model parameter space.

Fermion mass and mixing in the $U{(1)}_{B-L}$ extension of the standard model with D 4 symmetry

“…From equations (42), ( 44) and (45) we have a solution 13 : q q q q q q q q q q   . Some other issues such as the constraints from available collider, the predictions for Higgs doublet spectrum and the renormalization group evolution, etc, have been studied in [58,[143][144][145][146][147]] so we will not discuss further here. The model predictions sustain under renormalization group evolution because only one Higgs scalar doublet is allowed to have Yukawa interactions with a given type of right-handed fermion [148] and the model could potentially preserve perturbativity and vacuum stability all the way up to the Planck scale [149].…”

Computable conditions for order-2 CP symmetry in NHDM potentials

“…Below are the numerical values for the parameter point used in the example analyzed in section 4.3. All the non-zero elements are listed, except those which can be obtained by JHEP05(2024)260 3,4,5,6,22,23,24,25,26,27, 8,10,11,12,15,28,29,31,32,33,36,40,41,42, 16,17,19,20,21,34,37,38, Open Access. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.…”

“…4HDMs were studied in e.g. [16,17] and [18]. In the latter article, one doublet couples to quarks and three doublets couple to charged leptons, allowing for flavor changing neutral currents in the leptonic sector, but not in the quark sector.…”

Fermion masses and mixings in a $U(1)_X$ model based on the $Σ(18)$ discrete symmetry

“…which have been presented in Refs. [70,[75][76][77][78][79][80][81]. In addition, the large amount of parametric freedom allows to find a suitable region of parameter space where these FCNC can be suppressed.…”