Lepton number violating phenomenology of d = 7 neutrino mass models

Cepedello, Ricardo; Hirsch, Martin; Helo, Juan Carlos

doi:10.1007/jhep01(2018)009

Cited by 23 publications

(18 citation statements)

References 74 publications

(147 reference statements)

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“…(1.1) always leads to lower-dimensional loop models. For the d-dimensional contribution to the neutrino masses at tree level to dominate over that of the (d−2)-dimensional one at 1-loop, one requires Λ 2 TeV [28,29,[31][32][33][34]36].…”

Section: Jhep06(2021)084mentioning

confidence: 99%

“…events 33 in different statistically independent signal bins. 34 In the following, we embark on a mission to derive 95% CL upper limits on the total production cross-sections of triplet, quadruplet and quintuplet fermions in type-V seesaw from the CMS multilepton data in ref.…”

Section: Jhep06(2021)084mentioning

confidence: 99%

“…In case the neutrino masses are generated radiatively, each loop integrals will yield a suppression of 1/16π 2 . The general form of Majorana neutrino mass generated via the above operator is given by [28,29,[31][32][33][34]…”

Section: Introductionmentioning

confidence: 99%

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A genuine fermionic quintuplet seesaw model: phenomenological introduction

Ashanujjaman

Ghosh

2021

J. High Energ. Phys.

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We study a model which generates Majorana neutrino masses at tree-level via low-energy effective operator with mass-dimension-9. Introduction of such a higher dimensional operator brings down the lepton number violating mass scale to TeV making such model potentially testable at present or near future colliders. This model possesses several new SU(2)L fermionic multiplets, in particular, three generations of triplets, quadruplets and quintuplets, and thus a rich phenomenology at the LHC. Noting that lepton flavour violation arises very naturally in such setup, we put constraints on the Yukawa couplings and heavy fermion masses using the current experimental bounds on lepton flavour violating processes. We also obtain 95% CL lower bounds on the masses of the triplets, quadruplets and quintuplets using a recent CMS search for multilepton final states with 137 inverse femtobarn integrated luminosity data at 13 TeV center of mass energy. The possibility that the heavy fermions could be long-lived leaving disappearing charge track signatures or displaced vertex at the future colliders like LHeC, FCC-he, MATHUSLA, etc. is also discussed.

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Section: Jhep06(2021)084mentioning

confidence: 99%

Section: Jhep06(2021)084mentioning

confidence: 99%

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A genuine fermionic quintuplet seesaw model: phenomenological introduction

Ashanujjaman

Ghosh

2021

J. High Energ. Phys.

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“…rare kaon decay will at the same time contribute to the dimension-5 Weinberg operator. Thus any ∆L = 2 SMEFT operator contributes to a radiatively generated neutrino Majorana mass [41,42]. For example, the operators O 3b and O 8 generate radiative neutrino masses if the two quark legs are connected via a loop with an additional mass insertion, Higgs or vector boson loop, respectively, see figure 3.…”

Section: Jhep12(2020)186mentioning

confidence: 99%

Constraining lepton number violating interactions in rare kaon decays

Deppisch

Fridell

Harz

2020

J. High Energ. Phys.

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We investigate the possibility to probe lepton number violating (LNV) operators in the rare kaon decay K → πνν. Performing the analysis in the Standard Model effective field theory with only light active Majorana neutrinos, we determine the current limits on the corresponding LNV physics scale from the past E949 experiment at BNL as well as the currently operating experiments NA62 at CERN and KOTO at J-PARC. We focus on the specific signature of scalar currents in K → πνν arising from the LNV nature of the operators and study the effect on the experimental sensitivity, stressing the need for dedicated searches for beyond the SM currents. We find that the rare kaon decays probe high operator scales ΛLNV≈ 15 to 20 TeV in different quark and neutrino flavours compared to neutrinoless double beta decay. Furthermore, we comment that the observation of LNV in kaon decays can put high-scale leptogenesis under tension. Finally, we discuss the connection with small radiatively generated neutrino masses and show how the severe constraints therefrom can be evaded in a minimal ultraviolet-complete scenario featuring leptoquarks.

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“…Since for operators at dimension 11 and larger, the usual v/Λ suppression holds (no factors of Yukawa couplings can compensate it), in order to describe 0νββ in a model-independent way, one should include all SU (3) c × SU (2) L × U (1) Y -invariant ∆L = 2 operators up to dimension-nine in the SMEFT. Dimension-seven and -nine operators have been discussed in the literature in the context of models of radiative neutrino mass generation [50][51][52][53][54][55], R-Parity Violating Supersymmetry [56,57,47,58], and Left-Right Symmetric model [34,[59][60][61][62][63] (this is not an exhaustive list of references).…”

Section: Introductionmentioning

confidence: 99%

Lattice QCD Inputs for nuclear double beta decay

Cirigliano

Detmold

Nicholson

et al. 2020

Progress in Particle and Nuclear Physics

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Second order β-decay processes with and without neutrinos in the final state are key probes of nuclear physics and of the nature of neutrinos. Neutrinoful double-β decay is the rarest Standard Model process that has been observed and provides a unique test of the understanding of weak nuclear interactions. Observation of neutrinoless double-β decay would reveal that neutrinos are Majorana fermions and that lepton number conservation is violated in nature. While significant progress has been made in phenomenological approaches to understanding these processes, establishing a connection between these processes and the physics of the Standard Model and beyond is a critical task as it will provide input into the design and interpretation of future experiments. The strong-interaction contributions to double-β decay processes are non-perturbative and can only be addressed systematically through a combination of lattice Quantum Chromoodynamics (LQCD) and nuclear many-body calculations. In this review, current efforts to establish the LQCD connection are discussed for both neutrinoful and neutrinoless double-β decay. LQCD calculations of the hadronic contributions to the neutrinoful process nn → ppe − e −ν eνe and to various neutrinoless pionic transitions are reviewed, and the connections of these calculations to the phenomenology of double-β decay through the use of effective field theory (EFTs) is highlighted. At present, LQCD calculations are limited to small nuclear systems, and to pionic subsystems, and require matching to appropriate EFTs to have direct phenomenological impact. However, these calculations have already revealed qualitatively that there are terms in the EFTs that can only be constrained from double-β decay processes themselves or using inputs from LQCD. Future prospects for direct calculations in larger nuclei are also discussed. many-body methods and effective field theory (EFT) analysis of the transition operators, where lattice QCD can provide key input. To improve upon this situation, recent efforts have advocated an "endto-end" EFT analysis of 0νββ to link the scale Λ of LNV to nuclear scales. This multi-prong approach includes various steps:1. The use of the Standard Model EFT to link the scale Λ of LNV to the hadronic scale Λ χ ∼ O(1) GeV, where non-perturbative QCD effects arise. This step is by now mature: the operator basis (to which any underlying model can be matched) is known up to dimension-nine and the renormalization group evolution of these operators under strong interactions is known. Light new degrees of freedom (such as sterile neutrinos) can also be included in this framework.2. The matching of the quark-gluon level EFT to hadronic EFTs such as Chiral Perturbation Theory (χPT) in the meson and single nucleon sector, and chiral EFT and pionless EFT in the multinucleon sector. This step can be performed consistently in the strong and weak sectors of the theory, which in the case of interest here involves ∆L = 2 transition operators. The form of the transition operators is known to...

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Lepton number violating phenomenology of d = 7 neutrino mass models

Cited by 23 publications

References 74 publications

A genuine fermionic quintuplet seesaw model: phenomenological introduction

A genuine fermionic quintuplet seesaw model: phenomenological introduction

Constraining lepton number violating interactions in rare kaon decays

Lattice QCD Inputs for nuclear double beta decay

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