Nonuniversal anomaly-free U(1) model with three Higgs doublets and one singlet scalar field

Abstract

The flavor problem, neutrino physics and the fermion mass hierarchy are important motivations to extend the Standard Model into the TeV scale. A new family non-universal extension is presented with three Higgs doublets, one Higgs singlet and one scalar dark matter candidate. Exotic fermions are included in order to cancel chiral anomalies and to allow family non-universal U(1) X charges. By implementing an additional Z2 symmetry the Yukawa coupling terms are suited in such a way that the fermion mass hierarchy is obtained without fine-tuning. The neutrino sector include Majorana fermions to implement inverse see-saw mechanism. The effective mass matrix for SM neutrinos is fitted to current neutrino oscillation data to check the consistency of the model with experimental evidence, obtaining that the normal-ordering scheme is preferred over the inverse ones and the values of the neutrino Yukawa coupling constants are shown. Finally, the h → τ µ lepton-flavor-violation process is addressed with the rotation matrices of the CP-even scalars, left-and right-handed charged leptons, yielding definite regions where the model is consistent with CMS reports of BR(h → τ µ).

XENON1T takes a razor to a dark E6-inspired model

“…In our model (Eq.1) we are assuming that the dark matter candidate is a chiral field. Therefore the gauge anomaly cancellation becomes non-trivial and the mechanism behind the anomaly cancellation and Z mass can change our numerical findings [64,67,[76][77][78][79][80][81][82][83][84][85][86][87]. We will assume that Eq.1 offers a good description of the dark matter phenomenology and to simplify our analysis we adopt g χv = g χa .…”

B meson decay anomaly with a nonuniversal U(1)′ extension

“…In this article, we combine the nonuniversal Uð1Þ 0 model from [13] with a three Higgs doublet model in order to explain the anomaly measured by the LHCb in the ratio of the branching fractions of B þ → K þ μ þ μ − to B þ → K þ e þ e − decays. This model was already presented in [14], where the three doublets may induce naturally the fermion hierarchy, while the smallness of the neutrinos can be implemented through an inverse see saw mechanism, where the vacuum expectation value that breaks the extra Uð1Þ 0 symmetry defines the large mass scale.…”

Fermion mass hierarchy from nonuniversal Abelian extensions of the standard model

“…Furthermore, it is also possible to explain the mixing angles of quarks and leptons, as it was already shown in a similar model [22].…”

“…However, they give rich frameworks where fundamental issues such as fermion mass hierarchy can be addressed with the suited particle content and couplings. Moreover, this article shows how previous schemes [22] can be improved to avoid radiative corrections or finetunings and obtain in a natural way light and heavy fermions in accordance with experimental data.…”

“…In this way, the FMH can be understood in two Higgs doublet models (2HDM) [20] and next-to-minimal 2HDMs (N2HDM) [21] and N3HDM [22]. Thus, this article is oriented in nonuniversal Abelian extensions of the SM G SM ⊗ Uð1Þ X whose charges are different among families, and its symmetry breaking is ensured by a Higgs singlet χ at TeV scale.…”