Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

Wang, Weijian; Han, Zhi-Long

doi:10.1007/jhep04(2017)166

Cited by 54 publications

(32 citation statements)

References 232 publications

(347 reference statements)

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“…To obtain Dirac neutrinos one must break U (1) B−L → Z n with n ≥ 3 as the residual subgroup Z 2 always leads to Majorana neutrinos in accordance with (2). While traditionally mass models for Majorana neutrinos have garnered lot of attention, in recent years Dirac neutrino mass models are enjoying a resurgence of sorts with various seesaw [20,21,23,[31][32][33][36][37][38][39][40][41][42][43] and loops models [15,22,24,25,27,28,[44][45][46][47][48][49][50][51][52][53] considered in literature 4 . The operator based classification of such models at dimension-4 [58], dimension-5 [13,59] and dimension-6 [60,61] have also been considered.…”

Section: Residual Symmetries and The Neutrino Naturementioning

confidence: 99%

“…Finally, we discuss one example model where the Dirac neutrinos with naturally small one loop masses as well as dark matter stability, are both protected by the same residual Z 6 subgroup, without need for adding any new explicit or accidental symmetries beyond the Standard Model symmetries.1 For analogous framework for Majorana neutrinos see [16]. 2 The idea of obtaining dark matter stability associated to the breaking of U (1) B−L has been explored in [13,[15][16][17][18][19][20][21][22][23][24][25][26][27]. For recent works aimed at obtaining scotogenic stability from extended gauge symmetries see [28,29].…”

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confidence: 99%

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

Bonilla¹,

Peinado²,

Srivastava

2019

LHEP

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We consider the class of models where Dirac neutrino masses at one loop and the dark matter stability can be obtained using only the global U (1) B−L symmetry already present in Standard Model. We discuss how the residual Z n subgroup, left unbroken after the breaking of U (1) B−L , dictates the neutrino nature, namely if they are Dirac or Majorana particles, as well as determines the stability of the dark matter candidate in such models. In particular, we show that without the correct breaking of U (1) B−L to an appropriate residual Z n symmetry, the Dirac nature of neutrinos and/or dark matter stability might be lost. For completeness we also provide some examples where the dark matter stability is accidental or lost completely. Finally, we discuss one example model where the Dirac neutrinos with naturally small one loop masses as well as dark matter stability, are both protected by the same residual Z 6 subgroup, without need for adding any new explicit or accidental symmetries beyond the Standard Model symmetries.1 For analogous framework for Majorana neutrinos see [16]. 2 The idea of obtaining dark matter stability associated to the breaking of U (1) B−L has been explored in [13,[15][16][17][18][19][20][21][22][23][24][25][26][27]. For recent works aimed at obtaining scotogenic stability from extended gauge symmetries see [28,29].

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Section: Residual Symmetries and The Neutrino Naturementioning

confidence: 99%

mentioning

confidence: 99%

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

Bonilla¹,

Peinado²,

Srivastava

2019

LHEP

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“…refs. [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39]. 6 For a recent review of this topic see ref.…”

Section: Jhep11(2017)135mentioning

confidence: 99%

The μ-τ reflection symmetry of Dirac neutrinos and its breaking effect via quantum corrections

Zhang

Zhu

2017

J. High Energ. Phys.

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Given the Dirac neutrino mass term, we explore the constraint conditions which allow the corresponding mass matrix to be invariant under the µ-τ reflection transformation, leading us to the phenomenologically favored predictions θ 23 = π/4 and δ = 3π/2 in the standard parametrization of the 3 × 3 lepton flavor mixing matrix. If such a flavor symmetry is realized at a superhigh energy scale Λ µτ , we investigate how it is spontaneously broken via the one-loop renormalization-group equations (RGEs) running from Λ µτ down to the Fermi scale Λ F . Such quantum corrections to the neutrino masses and flavor mixing parameters are derived, and an analytical link is established between the Jarlskog invariants of CP violation at Λ µτ and Λ F . Some numerical examples are also presented in both the minimal supersymmetric standard model and the type-II two-Higgs-doublet model, to illustrate how the octant of θ 23 , the quadrant of δ and the neutrino mass ordering are correlated with one another as a result of the RGE-induced µ-τ reflection symmetry breaking effects.

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“…Recently, there has been a growing interest in models where neutrinos are assumed to be Dirac particles. Many of these models use ad hoc discrete symmetries [11][12][13][14][15][16][17][18][19][20][21] to forbid the aforementioned unnaturally small tree-level Yukawa term as well as Majorana mass terms.…”

Section: Introductionmentioning

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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Naturally small Dirac neutrino mass with intermediate SU(2) L multiplet fields

Cited by 54 publications

References 232 publications

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

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

The μ-τ reflection symmetry of Dirac neutrinos and its breaking effect via quantum corrections

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

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