Lepton number violation in 331 models

Fonseca, Renato M.; Hirsch, Martin

doi:10.1103/physrevd.94.115003

Cited by 37 publications

(35 citation statements)

References 82 publications

(135 reference statements)

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“…In addition to one radiative Dirac neutrino mass model [407], several radiative Majorana neutrino mass models have been proposed at 1-loop level [408][409][410][411][412][413][414][415][416][417][418][419][420][421][422][423][424], 2loop order [425][426][427][428][429][430], 3-loop order [431], and even at 4-loop order [98]. As lepton number violation (LNV) in 331 models and in particular neutrino mass generation has been discussed in a recent review [432], we refer the interested reader to it for a detailed discussion. However, we highlight one model based on gauged lepton number violation [420][421][422], which generates neutrino mass via lepton number violation in the 1-loop diagram shown in Fig.…”

Section: 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: Modelsmentioning

confidence: 99%

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

et al. 2017

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“…Extensions with vector-like leptons in nontrivial SU(2) L representations are also possible [432]. Unsurprisingly, the phenomenology [423,425,[433][434][435] and direct search constraints [433,434] for L-violating, doubly charged vector bosons are similar to L-violating, doubly charged scalar bosons, which we now discuss.…”

Section: Type II Seesaw Modelsmentioning

confidence: 91%

“…The Type II mechanism can be embedded in a number of extended gauge scenarios, for example the LRSM as discussed in Sec. 3.1.4, as well as GUTs, such as (331) theories [423][424][425][426] and the extensions of minimal SU(5) [427]. For (331) models, one finds the presence of bileptons [428,429], i.e., gauge bosons with L = ±2 charges and hence Q = ±2 electric charges.…”

Section: Type II Seesaw Modelsmentioning

confidence: 99%

Lepton Number Violation: Seesaw Models and Their Collider Tests

et al. 2018

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The Majorana nature of neutrinos is strongly motivated from the theoretical and phenomenological point of view. A plethora of neutrino mass models, known collectively as Seesaw models, exist that could generate both a viable neutrino mass spectrum and mixing pattern. They can also lead to rich, new phenomenology, including lepton number non-conservation as well as new particles, that may be observable at collider experiments. It is therefore vital to search for such new phenomena and the mass scale associated with neutrino mass generation at high energy colliders. In this review, we consider a number of representative Seesaw scenarios as phenomenological benchmarks, including the characteristic Type I, II, and III Seesaw mechanisms, their extensions and hybridizations, as well as radiative constructions. We present new and updated predictions for analyses featuring lepton number violation and expected coverage in the theory parameter space at current and future colliders. We emphasize new production and decay channels, their phenomenological relevance and treatment across different facilities in e + e − , e − p, and pp collisions, as well as the available Monte Carlo tools available for studying Seesaw partners in collider environments.

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“…Once φ 1,2 obtain vevs, the SM charged leptons mix with the vector-like state and the charged lepton masses can be made to agree with the experimental data. As discussed in [42], correctly fitting the τ mass requires…”

Section: Models Based On the 331 Groupmentioning

confidence: 99%

Gauge vectors and double beta decay

Fonseca

Hirsch

2017

Phys. Rev. D

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We discuss contributions to neutrinoless double beta (0νββ) decay involving vector bosons. The starting point is a list of all possible vector representations that may contribute to 0νββ decay via d = 9 or d = 11 operators at tree level. We then identify gauge groups which contain these vectors in the adjoint representation. Even though the complete list of vector fields that can contribute to 0νββ up to d = 11 is large (a total of 46 vectors), only a few of them can be gauge bosons of phenomenologically realistic groups. These latter cases are discussed in some more detail, and lower (upper) limits on gauge boson masses (mixing angles) are derived from the absence of 0νββ decay.

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Lepton number violation in 331 models

Cited by 37 publications

References 82 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

Lepton Number Violation: Seesaw Models and Their Collider Tests

Gauge vectors and double beta decay

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