Speaker
Description
Sterile neutrinos, non-interacting fermion singlets, are crucial in BSM physics, addressing oscillation anomalies and facilitating neutrino mass generation via type-I seesaw mechanism. We investigate a model extending the SM with 3 sterile neutrino states, employing a specific $(6\times6)$ unitary mixing matrix. Analytically deriving the masses of added sterile states using the exact seesaw relation, we study their impact on $\lvert m_{ee}\rvert$, relevant to neutrinoless double beta decay ($0\nu\beta\beta$) searches. Exploring the parameter space of $\lvert m_{ee}\rvert$ with consideration of the present and future sensitivity of $0\nu\beta\beta$ decay searches, we incorporate constraints from charged lepton flavor violation (cLFV) and non-unitarity effects, including additional CP-violating phases and active-sterile mixing angles. Our analysis also assesses the branching ratio of $\mu \to e\gamma$, a key cLFV process, within this framework.
| Field of contribution | Phenomenology |
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