Is left–right symmetry the key?

Senjanović, Goran

doi:10.1142/s021773231730004x

Cited by 15 publications

(14 citation statements)

References 44 publications

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“…Since then, the model with the following scalar multiplets: one bidoublet and two triplets was considered the minimal left-right symmetric model. There is no doubt that this proposal was, and still is, well motivated [57]. However, if the neutrinos ultimately turn out to be Dirac particles, all that effort will have been in vain.…”

Section: Discussionmentioning

confidence: 93%

Dirac neutrinos in an SU(2) left-right symmetric model

2020

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We propose a left-right symmetric model, with the scalar sector consisting of two doublets and several bidoublets, in which neutrinos remain as Dirac fermions in all orders in perturbation theory. Although with only two bidoublets the neutrino masses still need a ne-tuning, this is not the case when a third bidoublet is added. One of the scalar doublets may be inert, since the left-right symmetry forbids it to couple with fermions.

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Section: Discussionmentioning

confidence: 93%

Dirac neutrinos in an SU(2) left-right symmetric model

2020

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“…and parity P which ensures the equality between couplings in the left and right sectors, are still one of the most appealing and well-motivated extensions of the Standard Model (SM) [6][7][8][9][10][11][12][13][14][15]. Spontaneous breaking of SU (2) R × U (1) B−L × P down to the SM symmetry group explains the observed low-energy asymmetry between the left and right as well as provides a natural framework for the generation of small neutrino masses via the seesaw mechanism [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Low scale left-right symmetry and naturally small neutrino mass

Brdar

Smirnov

2019

J. High Energ. Phys.

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We consider the low scale (10 -100 TeV) left-right symmetric model with "naturally" small neutrino masses generated through the inverse seesaw mechanism. The Dirac neutrino mass terms are taken to be similar to the masses of charged leptons and quarks in order to satisfy the quark-lepton similarity condition. The inverse seesaw implies the existence of fermion singlets S with Majorana mass terms as well as the "left" and "right" Higgs doublets. These doublets provide the portal for S and break the left-right symmetry. The inverse seesaw allows to realize a scenario in which the large lepton mixing originates from the Majorana mass matrix of S fields which has certain symmetry. The model contains heavy pseudo-Dirac fermions, formed by S and the right-handed neutrinos, which have masses in the 1 GeV -100 TeV range and can be searched for at current and various future colliders such as LHC, FCC-ee and FCC-hh as well as in SHiP and DUNE experiments. Their contribution to neutrinoless double beta decay is unobservable. The radiative corrections to the mass of the Higgs boson and the possibility for generating the baryon asymmetry of the Universe are discussed. Modification of the model with two singlets (S L and S R ) per generation can provide a viable keV-scale dark matter candidate.

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“…Additionally, the see-saw mechanism comes in rather naturally in the context of leftright symmetric scenarios; aside from other nice features, as for instance the recovery of Parity Symmetry, and the appearance of right-handed currents at high energy, which also makes such extensions very appealing. Recently, the left-right scenarios have been revised [15][16][17][18][19][20][21][22][23][24][25] in order to make contact with the last experimental data of LHC. Moreover, the dark matter problem [26][27][28] and the diphoton excess anomaly [29][30][31][32][33] have been explored in this kind of scenarios.…”

Section: Introductionmentioning

confidence: 99%

Non-minimal flavored $${S}_{3}\otimes {Z}_{2}$$ S 3 ⊗ Z 2 left–right symmetric model

Gómez-Izquierdo

2017

Eur. Phys. J. C

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We propose a non-minimal left-right symmetric model with parity symmetry where the fermion mixings arise as a result of imposing an S 3 ⊗ Z 2 flavor symmetry, and an extra Z e 2 symmetry is considered in the lepton sector. Then the neutrino mass matrix possesses approximately the μ-τ symmetry. The breaking of the μ-τ symmetry induces sizable non-zero θ 13 , and the deviation of θ 23 from 45 • is strongly controlled by an free parameter and the neutrino masses. So, an analytic study of the CP parities in the neutrino masses is carried out to constrain the parameter and the lightest neutrino mass that accommodate the mixing angles. The results are: (a) the normal hierarchy is ruled out for any values of the Majorana phases; (b) for the inverted hierarchy the values of the reactor and atmospheric angles are compatible up to 2, 3 σ C.L.; (c) the degenerate ordering is the most favorable such that the reactor and atmospheric angle are compatible with the experimental data for a large set of values of the free parameters. The model predicts defined regions for the effective neutrino mass, the neutrino mass scale and the sum of the neutrino masses for the favored cases. Therefore, this model may be testable by the future experiments.

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Is left–right symmetry the key?

Cited by 15 publications

References 44 publications

Dirac neutrinos in an SU(2) left-right symmetric model

Dirac neutrinos in an SU(2) left-right symmetric model

Low scale left-right symmetry and naturally small neutrino mass

Non-minimal flavored $${S}_{3}\otimes {Z}_{2}$$ S 3 ⊗ Z 2 left–right symmetric model

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