2-6 December 2019
Centro Cultural, Universidad del Atlántico
America/Bogota timezone

Massive neutrinos and fermion mass hierarchy in a non-universal $U(1)_{X}$ extension with an invisible axion

4 Dec 2019, 18:00
Teatrino 1 (Centro Cultural, Universidad del Atlántico)

Teatrino 1

Centro Cultural, Universidad del Atlántico

Universidad del Atlántico Carrera 30 No. 8-49 Puerto Colombia, Atlántico


Yadir Garnica (Universidad Nacional de Colombia)


We present a non-universal $U(1)_{X}$ extension and an additional global anomala Peccei-Quinn (PQ) symmetry to the standard model (SM). The scheme proposed allow us to distinguish among fermion families without introducing additional discrete symmetries and generating the correct ansatz of mass matrix to obtain the fermionic mass spectrum in SM. The symmetry breakdown is performed by two scalar Higgs doublets and two scalar singlets, where one of these has the excitation associated with the axion-particle which turns out to be a candidate for dark matter. The exotic sector is composed of an invisible axion $a$, one up-type $T$ and two down-type $J^{1,2}$ heavy quarks, two heavy charged leptons $E,\mathcal{E}$ and one right-handed $\nu_{R}^{e,\mu,\tau}$ additional neutrino per family. In addition, the large energy scale associated with the spontaneously breaking (SSB) of the PQ-symmetry provides a solution to the strong CP-problem, also giving masses to the right neutrinos in such manner that the active neutrinos acquire $eV$-mass values due to the see-saw mechanism implementation. We comment on the implications of the proposed model with electroweak baryogenesis.

Primary authors

Yadir Garnica (Universidad Nacional de Colombia) Roberto Martinez (Universidad Nacional de Colombia)

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