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Low Energy Signatures of the TeV Scale See-Saw Mechanism
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abstract
We study a type I see-saw scenario where the right-handed (RH) neutrinos, responsible for the light neutrino mass generation, lie at the electroweak scale. Under certain conditions, the strength of the charged and neutral current weak interactions of the Standard Model particles with the heavy RH neutrinos can be large enough to allow their production at the LHC, opening also the possibility of observing other low energy signatures of the new physics in the electroweak precision observables as well as in searches for rare leptonic decays or neutrinoless double beta decay. We argue that in this scenario the flavour structure of the neutrino Yukawa couplings is essentially determined by the low energy neutrino parameters, leading to fairly strong correlations among the new phenomena. In particular, we show that the present bound on the $\mu \to e +\gamma$ decay rate makes very difficult the observation of the heavy RH neutrinos at the LHC or the observation of deviations from the Standard Model predictions in the electroweak precision data. We also argue that all present experimental constraints on this scenario still allow i) for an enhancement of the rate of neutrinoless double beta decay, which thus can be in the range of sensitivity of the GERDA experiment even when the light Majorana neutrinos possess a normal hierarchical mass spectrum, and ii) for the predicted $\mu \to e+ \gamma$ decay rate to be within the sensitivity range of the MEG experiment.
Forward citations
Cited by 7 Pith papers
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Dirac-Phase CP-Violation in the Low-Scale Type-I Seesaw with Three Right-Handed Neutrinos
Restricting CP violation in the low-scale type-I seesaw with three right-handed neutrinos to the Dirac phase δ alone yields specific testable subregions of heavy-neutrino flavor mixings and permits low-scale leptogene...
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Revealing Neutrino Mass Ordering at CEPC and FCC-ee
In the minimal two-HNL seesaw, heavy neutral lepton flavor mixings encode the normal vs inverted neutrino mass ordering, and CEPC/FCC-ee could distinguish them for total mixing U_tot^2 ≳ 10^-6.
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Testing the unitarity of the light neutrino mixing matrix
PMNS non-unitarity would make W+W- production cross sections grow anomalously with energy; LEP data already bound δ_e ≲ 0.0135 and future colliders could reach ~10^-5.
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Leptonic CP asymmetry and heavy neutrino searches in seesaw scenario
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Projected 5-year sensitivity of the proposed CiADS-BDE shows reach beyond current bounds for HNLs, electrophilic and LFV ALPs, and RPV light binos.
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Flavor phenomenology of light dark particles
Review surveying limits and prospects for flavor-violating decays of light axion-like particles, highlighting complementarity of lab, astro, and cosmo probes up to 10^12 GeV scales.
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A pedagogical review that explains how adding right-handed neutrinos can generate small neutrino masses through seesaw mechanisms and what experimental signatures such models predict.
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