Abstract
We study the effect of sterile neutrino on some low-scale processes in the framework of the minimal extended seesaw (MES). MES is the extension of the seesaw mechanism with the addition of sterile neutrino of intermediate mass. The MES model in this work is based on Δ(96) ×C2×C3flavor symmetry. The structures of mass matrices in the framework lead toTM1mixing withμ–τsymmetry. The model predicts the maximal value of the Dirac CP phase. We carry out our analysis to study the new physics contributions from the sterile neutrino to different charged lepton flavor violation (cLFV) processes involving muon and tau leptons as well as neutrinoless double beta decay (0νββ). The model predicts normal ordering (NO) of neutrino masses, and we perform the numerical analysis considering normal ordering (NO) only. We find that a heavy sterile neutrino can lead to cLFV processes that are within the reach of current and planned experiments. The sterile neutrino present in our model is consistent with the current limits on the effective neutrino mass set by 0νββexperiments.
Highlights
The observed neutrino oscillation phenomenon, the origin of the idea behind the massive nature of neutrinos, has been one of the most appealing evidence to expect physics beyond the standard model (BSM)
We have studied the effect of sterile neutrino on the low-energy processes focusing on charged lepton flavor violation and neutrinoless double beta decay
The framework of our study is an minimal extended seesaw (MES) model which is obtained by the addition of a triplet of right-handed neutrinos and a sterile neutrino singlet field to the standard model
Summary
The observed neutrino oscillation phenomenon, the origin of the idea behind the massive nature of neutrinos, has been one of the most appealing evidence to expect physics beyond the standard model (BSM). Charged lepton flavor violation (cLFV) processes can provide a way to search for new physics beyond the standard model. Sterile neutrinos can account for many cosmological observations such as dark matter [22,23,24,25,26] and baryon asymmetry of the universe (BAU) [27, 28] Their mixing with the active neutrinos can contribute to certain non-oscillation processes such as neutrinoless double decay (0]ββ) amplitude or to beta decay spectra in the KATRIN experiment [29, 30]. The extra sterile state may have a significant contribution to cLFV processes and 0]ββ depending on its mass and mixing with the active neutrinos in the model.
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