Probing charged lepton number violation via 
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Aoki, M.; Enomoto, Kazuki; Kanemura, Shinya

doi:10.1103/physrevd.101.115019

Cited by 11 publications

(8 citation statements)

References 119 publications

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“…In the case of dimension-7 operators, a sizable fraction of the operators do not involve quarks, so many cannot be directly accessed at the LHC. A subset of dimension-7 that can be tested at the LHC correspond to the case of same-sign W ± W ± scattering into same-sign leptons ± i ± j when mediated by a far off-shell Majorana neutrino [88][89][90][91]. With the full Run II data set, the CMS experiment exclude m 4 = 10 TeV Majorana neutrinos with with |V µ4 | 2 > 0.1 at 95% CL [87].…”

Section: B Lepton Number Violation At the Tev Scalementioning

confidence: 99%

Neutrinoless Double-Beta Decay: A Roadmap for Matching Theory to Experiment

Cirigliano¹,

Davoudi²,

Dekens³

et al. 2022

Preprint

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The observation of neutrino oscillations and hence non-zero neutrino masses provided a milestone in the search for physics beyond the Standard Model. But even though we now know that neutrinos are massive, the nature of neutrino masses, i.e., whether they are Dirac or Majorana, remains an open question. A smoking-gun signature of Majorana neutrinos is the observation of neutrinoless double-beta decay, a process that violates the lepton-number conservation of the Standard Model. This white paper focuses on the theoretical aspects of the neutrinoless double-beta decay program and lays out a roadmap for future developments. The roadmap is a multi-scale path starting from high-energy models of neutrinoless double-beta decay all the way to the low-energy nuclear many-body problem that needs to be solved to supplement measurements of the decay rate. The path goes through a systematic effective-field-theory description of the underlying processes at various scales and needs to be supplemented by lattice quantum chromodynamics input. The white paper also discusses the interplay between neutrinoless double-beta decay, experiments at the Large Hadron Collider and results from astrophysics and cosmology in probing simplified models of lepton-number violation at the TeV scale, and the generation of the matter-antimatter asymmetry via leptogenesis. This white paper is prepared for the topical groups TF11 (Theory of Neutrino Physics), TF05 (Lattice Gauge Theory), RF04 (Baryon and Lepton Number Violating Processes), NF03 (Beyond the Standard Model) and NF05 (Neutrino Properties) within the Theory Frontier, Rare Processes and Precision Frontier, and Neutrino Physics Frontier of the U.S. Community Study on the Future of Particle Physics (Snowmass 2021).

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Section: B Lepton Number Violation At the Tev Scalementioning

confidence: 99%

Neutrinoless Double-Beta Decay: A Roadmap for Matching Theory to Experiment

Cirigliano¹,

Davoudi²,

Dekens³

et al. 2022

Preprint

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“…Generally, LNV operators can occur only at odd mass dimensions such that the SM Lagrangian L SM can be extended as [11,23,25], apart from those including gauge bosons or derivatives, as they may be more difficult to incorporate in renormalizable ultraviolet (UV) complete theories at tree level [23]. These are nevertheless interesting, and gauge invariant LNV operators with derivatives could be searched for at the LHC in same-sign gauge boson fusion [26]. However, for a given LNV process, operators with derivatives generally occur at higher dimension than those without, which is why we neglect such operators here.…”

Section: Lnv Operatorsmentioning

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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“…As shown in figure 1, this is essentially a realization of neutrinoless ββ (0νββ) decay at large momentum transfer when mediated at dimension d = 7 [37][38][39]. While past studies have investigated the importance of this channel [6,26,36,40,41], most works were restricted to sub-TeV m N , and therefore subject to signal processes with more dominant cross sections.…”

Section: Introductionmentioning

confidence: 99%

Majorana Neutrinos in Same-Sign $W^\pm W^\pm$ Scattering at the LHC: Breaking the TeV Barrier

Fuks,

Neundorf,

Peters

et al. 2020

Preprint

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We revisit the sensitivity to non-resonant, heavy Majorana neutrinos N in same-sign W ± W ± scattering at the √ s = 13 TeV LHC and its high-luminosity upgrade. As a benchmark scenario, we work in the context of the Phenomenological Type I Seesaw model, relying on a simulation up to next-to-leading order in QCD with parton shower matching. After extensively studying the phenomenology of the pp → µ ± µ ± jj process at the amplitude and differential levels, we design a simple collider analysis with remarkable signal-background separation power. At 95% confidence level, we find that the squared muon-heavy neutrino mixing element |VµN | 2 can be probed down to 0.1 − 0.5 (0.05 − 0.1) for mN = 1 − 10 TeV with L = 300 fb −1 (3 ab −1 ). For heavier masses of mN = 20 TeV, we report sensitivity for |VµN | 2 0.8 (0.4). The W ± W ± scattering channel can greatly extend the mass range covered by current LHC searches for heavy Majorana neutrinos and particularly adds invaluable sensitivity above a few hundred GeV. We comment on areas where the analysis can be improved as well as on the applicability to other tests of neutrino mass models.

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Probing charged lepton number violation via ℓ±ℓ′±W∓W

Cited by 11 publications

References 119 publications

Neutrinoless Double-Beta Decay: A Roadmap for Matching Theory to Experiment

Neutrinoless Double-Beta Decay: A Roadmap for Matching Theory to Experiment

Constraining lepton number violating interactions in rare kaon decays

Majorana Neutrinos in Same-Sign $W^\pm W^\pm$ Scattering at the LHC: Breaking the TeV Barrier

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