Seesaw Dirac neutrino mass through dimension-six operators

Chuliá, Salvador Centelles; Srivastava, Rahul; Valle, J. W. F.

doi:10.1103/physrevd.98.035009

Cited by 46 publications

(29 citation statements)

References 50 publications

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“…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%

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%

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

Bonilla¹,

Peinado²,

Srivastava

2019

LHEP

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“…In this direction, several seesaw mechanisms [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] and loop models for Dirac neutrinos have been recently proposed. Due to an increasing interest in Dirac neutrino mass models, a classification of such tree-level and one-loop models at dimension 4 [64], dimension 5 [65,66] and dimension 6 [67,68] have also been considered.…”

Section: Introductionmentioning

confidence: 99%

Systematic classification of two-loop d = 4 Dirac neutrino mass models and the Diracness-dark matter stability connection

Chuliá

Cepedello

Peinado

et al. 2019

J. High Energ. Phys.

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We provide a complete systematic classification of all two-loop realizations of the dimension four operator for Dirac neutrino masses. Our classification is multilayered, starting first with a classification in terms of all possible distinct two loop topologies. Then we discuss the possible diagrams for each topology. Model-diagrams originating from each diagram are then considered. The criterion for genuineness is also defined and discussed at length. Finally, as examples, we construct two explicit models which also serve to highlight the intimate connection between the Dirac nature of neutrinos and the stability of dark matter.

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“…Note that in such a case the vector-like mass term for σ and E will break this Z 2 symmetry softly 5. For other interesting implementations of purely Dirac neutrino masses in the context of other models see for example[54][55][56][57].…”

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confidence: 99%

Alternative formulation of left-right symmetry with B−L conservation and purely Dirac neutrinos

et al. 2019

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We propose an alternative formulation of a Left-Right Symmetric Model (LRSM) where the difference between baryon number (B) and lepton number (L) remains an unbroken symmetry. This is unlike the conventional formulation, where B − L is promoted to a local symmetry and is broken explicitly in order to generate Majorana neutrino masses. In our case B −L remains a global symmetry after the left-right symmetry breaking, allowing only Dirac mass terms for neutrinos. In addition to parity restoration at some high scale, this formulation provides a natural framework to explain B − L as an anomaly-free global symmetry of the Standard Model and the non-observation of (B − L)-violating processes. Neutrino masses are purely Dirac type and are generated either through a two loop radiative mechanism or by implementing a Dirac seesaw mechanism.

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Seesaw Dirac neutrino mass through dimension-six operators

Cited by 46 publications

References 50 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

Systematic classification of two-loop d = 4 Dirac neutrino mass models and the Diracness-dark matter stability connection

Alternative formulation of left-right symmetry with B−L conservation and purely Dirac neutrinos

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