Type-II seesaw mechanism for Dirac neutrinos and its implications on N_eff and lepton flavor violation in a 3-3-1 model

Autor(es)

Oliveira, Vinicius ; Escalona, Patricio ; Angel, Lucia ; Pires, C. A. de S. ; Queiroz, Farinaldo S.

• Tipo de documento: Artigo Científico
• Fonte: Journal of High Energy Physics; v. N/A, n. 7, p. 29-pg., 2025-07-17.

Resumo

In this study, we implement the type-II seesaw mechanism for Dirac neutrino masses within the framework of a 3-3-1 model. To this end, we introduce a scalar sextet and impose both lepton number conservation and invariance under a discrete Z(2) symmetry in the Lagrangian. This mechanism naturally generates small Dirac neutrino masses by allowing the soft breaking of the Z(2) symmetry through a unique term in the scalar potential, while preserving lepton number. Specifically, we explore the realization of this model at low-energy scales. Regarding flavor implications, we analyze its contributions to the rare decay processes mu -> e gamma and . In the cosmological context, we analyze the influence of right-handed neutrinos on the effective number of neutrino species, N-eff, through interactions mediated by the Z(') boson. Our findings establish a lower bound of > 4.4 TeV, which slightly exceeds the current lower limit set by the Large Hadron Collider (LHC) (AU)

• Processo FAPESP: 21/01089-1 - Cherenkov Telescope Array: construção e primeiras descobertas
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