Fermion masses and mixings and some phenomenological aspects of a 3-3-1 model with linear seesaw mechanism

Abstract

We propose a viable model based on the SU (3)C × SU (3)L × U (1)X gauge group supplemented by the S4 family symmetry and other auxiliary cyclic symmetries, whose spontaneous breaking gives rise to the observed pattern of SM fermion masses and mixing angles. In the proposed model the small light active neutrino masses are generated from a linear seesaw mechanism mediated by three Majorana neutrinos. The model is capable of reproducing the experimental values of the physical observables of both quark and lepton sectors. Our model is predictive in the quark sector having 9 effective parameters that allow to successfully reproduce the four CKM parameters and the six Standard Model (SM) quark masses. In the SM quark sector, there is particular scenario, motivated by naturalness arguments, which allows a a good fit for its ten observables, with only six effective parameters. We also study the single heavy scalar production via gluon fusion mechanism at proton-proton collider. Our model is also consistent with the experimental constraints arising from the Higgs diphoton decay rate.

Linear seesaw model with T 7 symmetry for neutrino mass and mixing

“…One of these symmetries, , has been widely used in various studies [8][9][10][11][12][13][14]. The linear seesaw mechanism with non-Abelian discrete symmetries has been investigated in [15][16][17][18][19][20][21][22][23]; however, there are substantial differences between those studies and our present work. In those studies, the lepton and/or quark masses and mixings were obtained by i) many doublets [15][16][17][18][19][20][21][22][23], ii) other non-Abelian discrete symmetries [16,18,[21][22][23], iii) other Abelian discrete symmetries [15][16][17][18][19][20][21][22][23], and iv) other gauge symmetries [16][17][18][19][20][21][22][23].…”

Vectorlike leptons and inert scalar triplet: Lepton flavor violation, g−2 , and collider searches

“…3-3-1 models are based on the SUð3Þ C × SUð3Þ L × Uð1Þ N gauge symmetry and were originally introduced since they offer a plausible answer to the number of generations in the Standard Model. These models have been extensively studied in contexts such as dark matter [44][45][46][47][48][49][50][51][52][53][54][55][56], flavor physics [57][58][59][60][61], neutrino masses [62][63][64][65][66][67][68][69][70][71], and collider physics [72][73][74][75].…”

A 4-based model with linear seesaw scheme for lepton mass and mixing

“…However, the mentioned works contain non minimal scalar sectors with many SU(2) L doublets (hereafter called doublet) and they are differences with the current study. Namely, in previous works [35, 38-40, 36, 37, 41-43], the quark and/or lepton masses and mixings are generated by (i) other non-Abelian discrete symmetries [38,[40][41][42][43], (ii) other Abelian discrete symmetries [35, 38-40, 36, 37, 41-43], (iii) other gauge symmetries [38-40, 36, 37, 41-43], (iv) and many scalar fields: up to nine doublets [35], three triplets and fifteen singlets [38], one doublets and ten singlets [39], thirteen doublets and fourteen singlets [40], one doublets and nine singlets [36,37], five doublets and fifteen singlets [41], three doublets and nine singlets [42], and three triplets, two doublets and fifteen singlets [43]. Therefore, it is necessary and important to search for another extension with a simpler scalar sector for explaining the observed neutrino data.…”