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# Gauge extensions of the Standard Model: generating natural masses for neutrinos and charged leptons

 Grant number: 17/23027-2 Support type: Scholarships in Brazil - Post-Doctorate Effective date (Start): March 01, 2018 Effective date (End): February 28, 2022 Field of knowledge: Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields Principal researcher: Alex Gomes Dias Grantee: Julio Rafael da Silva Leite Home Institution: Centro de Ciências Naturais e Humanas (CCNH). Universidade Federal do ABC (UFABC). Ministério da Educação (Brasil). Santo André , SP, Brazil Associated scholarship(s): 19/04195-7 - Low-scale neutrino mass generation mechanisms from TeV scale gauge extensions of the Standard Model, BE.EP.PD Abstract The generation of neutrino masses and the mass hierarchy among the different fermion families are some of the most important problems left unanswered by the Standard Model. The search for consistent explanations for these and other questions has led to the proposal of several Standard Model extensions. A more complete theory can be obtained by extending the original gauge group to $SU(3)_c \otimes SU(M)_L \otimes SU(N)_R \otimes U(1)_X$. The cases with $M=3$ ($N=1$) and $M=N=3$, in particular, contain various attractive features, such as the fact that the number of fermion families is fixed to be three, and the possibility of explaining the parity violation in the Standard Model as a dynamical process. In this research project, making use of the inner advantages of such models, we will explore possible solutions for the open questions mentioned above. In particular, we will focus on building and analyzing models that lead to the needed symmetry breaking and mass generation patterns through minimal scalar sectors, which are more relevant from a phenomenological viewpoint.