Some phenomenological aspects of a newU(1)′model

Abstract

We propose a new nonuniversal $U(1{)}^{\ensuremath{'}}$ 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 ${Z}^{\ensuremath{'}}$ boson in the quark sector and universal couplings in the lepton sector. From experimental data on ${Z}^{\ensuremath{'}}$ research at the CERN LHC, we find limit regions in the $U(1{)}^{\ensuremath{'}}$ free parameters (${Z}^{\ensuremath{'}}$ mass and coupling constant), which we use to obtain the total decay width and invariant-mass 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.