Some phenomenological aspects of a newU(1)′model

Abstract

We propose a new non-universal U (1) ′ extension of the standard model with the addition of three exotic quark singlets, two scalar singlets and one additional scalar doublet. We obtain family dependent couplings with a new Z ′ boson in the quark sector and universal couplings with the lepton sector. From experimental data on Z ′ research at CERN-LHC collider, we find limit regions in the U (1) ′ free parameters (Z ′ mass and coupling constant), which we use to obtain total decay width and invariantmass distributions. By introducing discrete symmetries and mixing couplings between ordinary and exotic fermions, we obtain predictable mass relations in the quark sector compatible with the phenomenological values without large fine tuning of the Yukawa couplings and with few free parameters, where hierarchies between quark families can be understood from the existence of heavy beyond standard model particles.

Z ′, Higgses and heavy neutrinos in U(1)′ models: from the LHC to the GUT scale

“…We consider three right-handed neutrinos, one for each family, as predicted by an anomaly free and flavour universal Abelian extension. See [12][13][14][15] for some non-universal examples.…”

Mass problem in the Standard Model

“…On the other hand, the set of charges U(1) X of the fermion sector is strongly constraint by the cancellation of chiral anomalies [8]. Thus, in order to obtain nonuniversal charges and also cancel any chiral anomaly in the model, exotic quarks T , J 1,2 and leptons E 1,2 have been included, together with right-handed neutrinos ν e,µ,τ R and Majorana fermions N 1,2,3 R so as inverse seesaw mechanism (ISS) is available to get small neutrino masses [14].…”

“…Their suitability has been shown in addressing quark masses [8], dark matter [9,10] [11] and lepton masses [12], where light fermions acquire masses through radiative corrections. However, by doing a slight modification in adding an additional doublet, a completely new scheme emerges with interesting texture matrices from which the FMH can be obtained naturally.…”

Fermion mass hierarchy from nonuniversal Abelian extensions of the standard model

“…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.…”