XXVI DAE-BRNS High Energy Physics Symposium 2024

Exploring Neutrinoless Double Beta Decay in the 3+3 Model

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Postar Neutrino Physics

Speaker

Debashree Priyadarsini Das (NIT Rourkela)

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 $(6\times 6)$ unitary mixing matrix. Analytically deriving the masses of added sterile states using the exact seesaw relation, we study their impact on $|m_{ee}|$, relevant to neutrinoless double beta decay ($0\nu \beta \beta$) searches. Exploring the parameter space of $|m_{ee}|$ 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.