Naturally light Dirac neutrino in Left-Right Symmetric Model

Borah, Debasish; Dasgupta, Arnab

doi:10.1088/1475-7516/2017/06/003

Cited by 49 publications

(47 citation statements)

References 121 publications

(196 reference statements)

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“…Many of the proposed 1-loop models are realized in a left-right symmetric context without SU(2) triplet scalars [56,390,[393][394][395][396][397][398]. Reference [399] attempted the generation of Dirac neutrino masses in the context of a model where hypercharge emerges as diagonal subgroup of U (1) L × U (1) R .…”

Section: -Loop Modelsmentioning

confidence: 99%

From the Trees to the Forest: A Review of Radiative Neutrino Mass Models

et al. 2017

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A plausible explanation for the lightness of neutrino masses is that neutrinos are massless at tree level, with their mass (typically Majorana) being generated radiatively at one or more loops. The new couplings, together with the suppression coming from the loop factors, imply that the new degrees of freedom cannot be too heavy (they are typically at the TeV scale). Therefore, in these models there are no large mass hierarchies and they can be tested using different searches, making their detailed phenomenological study very appealing. In particular, the new particles can be searched for at colliders and generically induce signals in lepton-flavor and lepton-number violating processes (in the case of Majorana neutrinos), which are not independent from reproducing correctly the neutrino masses and mixings. The main focus of the review is on Majorana neutrinos. We order the allowed theory space from three different perspectives: (i) using an effective operator approach to lepton number violation, (ii) by the number of loops at which the Weinberg operator is generated, (iii) within a given loop order, by the possible irreducible topologies. We also discuss in more detail some popular radiative models which involve qualitatively different features, revisiting their most important phenomenological implications. Finally, we list some promising avenues to pursue.

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Section: -Loop Modelsmentioning

confidence: 99%

From the Trees to the Forest: A Review of Radiative Neutrino Mass Models

et al. 2017

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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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“…3 For Dirac neutrino mass models based on SU (2) L ×SU (2) R ×U (1) B−L symmetry see Refs. [5,[32][33][34][35][36][37][38][39], on U (1) R symmetry see Ref. [31], on U (1) L × U (1) R symmetry see Ref.…”

Section: Introductionmentioning

confidence: 99%

Simplest radiative Dirac neutrino mass models

Saad

2019

Nuclear Physics B

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If neutrinos are Dirac particles, their right-handed partners must be present in the theory. Once introduced in the Standard Model (SM), the difference between the baryon number B and the lepton number L can be promoted to a local U (1) B−L symmetry since the corresponding gauge anomalies can be canceled by the right-handed neutrinos. Furthermore, the extremely small neutrino mass can be explained naturally if it is originated from the quantum correction. In this work, we propose simplest models of radiative Dirac neutrino mass using only U (1) B−L symmetry, and without introducing additional fermions and without imposing ad hoc symmetries. In this simple framework, we provide minimal models where Dirac neutrino mass appears at the (i) one-loop, (ii) two-loop and (iii) three-loop. By performing systematic analysis, we show that the minimal one-loop model requires three beyond SM scalar multiplets, whereas minimal two-loop and three-loop models require five. The presented two-loop and three-loop Dirac mass models have not appeared in the literature before. *

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Naturally light Dirac neutrino in Left-Right Symmetric Model

Cited by 49 publications

References 121 publications

From the Trees to the Forest: A Review of Radiative Neutrino Mass Models

From the Trees to the Forest: A Review of Radiative Neutrino Mass Models

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

Simplest radiative Dirac neutrino mass models

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