The role of residual symmetries in dark matter stability and the neutrino nature

Bonilla, César; Peinado, E.; Srivastava, Rahul

doi:10.31526/lhep.1.2019.124

Cited by 15 publications

(24 citation statements)

References 80 publications

(164 reference statements)

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“…First we note that it is extended with respect to that of the simplest model, as it contains an extra scalar χ running in the scotogenic loop. As in other scotogenic extensions of the SM [5][6][7][8][9][10][11][12][13][14][15][16], here also the lightest dark-sector particle has its stability ensured by symmetry, in this case the residual Z 2 subgroup that survives the breaking of the horizontal Z 8 group, see table I. Thus the lightest of these particles will be a good candidate for dark matter, which can either be a fermion or a scalar.…”

Section: Discussionmentioning

confidence: 84%

“…This is due to the fact that for odd Z N groups if we assign an odd charge to a given dark field then its Hermitian conjugate will always have an even charge under the odd Z N , hence it can mix with other particles with even Z N charge. In conclusion, for odd Z N groups, one cannot ensure dark matter stability [11,13].…”

Section: Jhep04(2021)249mentioning

confidence: 93%

“…Moreover, the basic understanding and interpretation of cosmological dark matter presents us with a comparable challenge [4]. The idea that dark matter mediates neutrino mass generation [5] has now become a paradigm for new physics, both within [6][7][8][9][10][11][12][13][14][15][16] as well as beyond the simplest SU(3) c ⊗ SU(2) L ⊗ U(1) Y Standard Model (SM) gauge structure [17][18][19][20][21]. These "Scotogenic models" complement the seesaw mechanism by providing a central role to dark matter.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Minimal scoto-seesaw mechanism with spontaneous CP violation

Barreiros

Joaquim

Srivastava

et al. 2021

J. High Energ. Phys.

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We propose simple scoto-seesaw models to account for dark matter and neutrino masses with spontaneous CP violation. This is achieved with a single horizontal $$ {\mathcal{Z}}_8 $$ Z 8 discrete symmetry, broken to a residual $$ {\mathcal{Z}}_2 $$ Z 2 subgroup responsible for stabilizing dark matter. CP is broken spontaneously via the complex vacuum expectation value of a scalar singlet, inducing leptonic CP-violating effects. We find that the imposed $$ {\mathcal{Z}}_8 $$ Z 8 symmetry pushes the values of the Dirac CP phase and the lightest neutrino mass to ranges already probed by ongoing experiments, so that normal-ordered neutrino masses can be cornered by cosmological observations and neutrinoless double beta decay experiments.

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Section: Discussionmentioning

confidence: 84%

Section: Jhep04(2021)249mentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Minimal scoto-seesaw mechanism with spontaneous CP violation

Barreiros

Joaquim

Srivastava

et al. 2021

J. High Energ. Phys.

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“…The model includes two heavy Majorana neutrinos N 2 and N 3 with exotic B − L charge −4, which ensures their stability by forbidding the interaction with SM particles, and the interaction Lagrangian is given as where D μ = ∂ μ − 4ig BL Z μ . These fermions acquire masses when the local B −L symmetry is broken and thereby leading to an inherent symmetry of N 2,3 → −N 2,3 , which mimics the Z 2 symmetry, ensuring the stability of the DM [12,99]. All the two body decays of these DM candidates are kinematically forbidden at re-normalizable level, since all the generic Yukawa interactions with SM leptons are not allowed and by assuming the mass of the scalar field is greater than mass of the dark matter candidates.…”

Section: Dark Matter Phenomenologymentioning

confidence: 99%

Neutrino phenomenology and dark matter in an $$A_4$$ flavour extended $$B-L$$ model

et al. 2020

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We present an A 4 flavor extended B − L model for realization of eV scale sterile neutrinos, motivated by the recent experimental hints from both particle physics and cosmology. The framework considered here is a gauged B − L extension of standard model without the introduction of righthanded neutrinos, where the gauge triangle anomalies are canceled with the inclusion of three exotic neutral fermions N i (i = 1, 2, 3) with B − L charges − 4, − 4 and 5. The usual Dirac Yukawa couplings between the SM neutrinos and the exotic fermions are absent and thus, the model allows natural realization of eV scale sterile-like neutrino and its mixing with standard model neutrinos by invoking A 4 flavor symmetry. We demonstrate how the exact tri-bimaximal mixing pattern is perturbed due to active-sterile mixing by analyzing 1 + 3 case in detail. We also show the implication of eV scale sterile-like neutrino on various observables in neutrino oscillation experiments and the effective mass in neutrinoless double beta decay. Another interesting feature of the model is that one of three exotic fermions is required to explain eV scale phenomena, while other two fermions form stable dark matter candidates and their total relic density satisfy the observed 3σ limit of Planck data. We constrain the gauge parameters associated with U (1) gauge extension, using relic density and collider bounds.

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“…Furthermore, we also study the associated charged lepton flavor violating processes, dark matter phenomenology and cosmological constraints of these models. * metry [30] for generating the Dirac neutrino mass [28,[31][32][33][34][35]. Both of the two possibilities are attractive and can be regarded as the minimal gauge extensions of the SM.…”

mentioning

confidence: 99%

Minimal dirac neutrino mass models from $$\hbox {U}(1)_{\mathrm{R}}$$ gauge symmetry and left–right asymmetry at colliders

2019

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In this work, we propose minimal realizations for generating Dirac neutrino masses in the context of a right-handed abelian gauge extension of the Standard Model. Utilizing only U (1) R symmetry, we address and analyze the possibilities of Dirac neutrino mass generation via (a) tree-level seesaw and (b) radiative correction at the one-loop level. One of the presented radiative models implements the attractive scotogenic model that links neutrino mass with Dark Matter (DM), where the stability of the DM is guaranteed from a residual discrete symmetry emerging from U (1) R . Since only the right-handed fermions carry non-zero charges under the U (1) R , this framework leads to sizable and distinctive Left-Right asymmetry as well as Forward-Backward asymmetry discriminating from U (1) B−L models and can be tested at the colliders.We analyze the current experimental bounds and present the discovery reach limits for the new heavy gauge boson Z at the LHC and ILC. Furthermore, we also study the associated charged lepton flavor violating processes, dark matter phenomenology and cosmological constraints of these models. * metry [30] for generating the Dirac neutrino mass [28,[31][32][33][34][35]. Both of the two possibilities are attractive and can be regarded as the minimal gauge extensions of the SM. However, the phenomenology of U (1) R model is very distinctive compared to the U (1) B−L case. In the literature, gauged U (1) B−L symmetry has been extensively studied whereas gauged U (1) R extension has received very little attention.Unlike the U (1) B−L case, in our set-up, the SM Higgs doublet is charged under this U (1) R symmetry to allow the desired Yukawa interactions to generate mass for the charged fermions, this leads to interactions with the new gauge boson that is absent in U (1) B−L model. The running of the Higgs quartic coupling gets modified due to having such interactions with the new gauge boson Z that can make the Higgs vacuum stable [36]. Due to the same reason, the SM Higgs phenomenology also gets altered [37].We show by detail analysis that despite their abelian nature, U (1) R and U (1) B−L have distinguishable phenomenology. The primary reason that leads to different features is:U (1) R gauge boson couples only to the right-handed chiral fermions, whereas U (1) B−L is chirality-universal. As a consequence, U (1) R model leads to large left-right (LR) asymmetry and also forward-backward (FB) asymmetry that can be tested in the current and future colliders that make use of the polarized initial states, such as in ILC. We also comment on the differences of our U (1) R scenario with the other U (1) R models existing in the literature. Slightly different features emerge as a result of different charge assignment of the righthanded neutrinos in our set-up for the realization of Dirac neutrino mass. In the existing U (1) R models, flavor universal charge assignment for the right-handed neutrinos are considered and neutrinos are assumed to be Majorana particles. Whereas, in our set-up, neutrinos are Dira...

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The role of residual symmetries in dark matter stability and the neutrino nature

Cited by 15 publications

References 80 publications

Minimal scoto-seesaw mechanism with spontaneous CP violation

Minimal scoto-seesaw mechanism with spontaneous CP violation

Neutrino phenomenology and dark matter in an $$A_4$$ flavour extended $$B-L$$ model

Minimal dirac neutrino mass models from $$\hbox {U}(1)_{\mathrm{R}}$$ gauge symmetry and left–right asymmetry at colliders

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