PPC 2024: XVII International Conference on Interconnections between Particle Physics and Cosmology

Neutrino Phenomenology in A4 Modular Symmetry with Scoto Seesaw Mechanism

15 Oct 2024, 16:30

15m

Seminar Room 3-4, Convention Center (IIT Hyderabad)

Parallel talk Parallel - Neutrino

Speaker

Priya Mishra

Description

The innovative aspect of this study is the introduction of a hybrid scoto-seesaw model based on $A_4$ discrete modular symmetry, which has many intriguing phenomenological implications. Using the type-I seesaw mechanism at the tree level, the scoto-seesaw framework generates one mass square difference $(\mathrm{\Delta }{m}_{\mathrm{a}\mathrm{t}\mathrm{m}}^2$). Furthermore, a clear explanation of the two distinct mass square differences is provided by the scotogenic contribution, which is essential in deriving the other mass square difference ($\mathrm{\Delta }{m}_{\mathrm{s}\mathrm{o}\mathrm{l}}^2$) at the loop level. Under the $A_4$ modular symmetry, Yukawa couplings undergo a non-trivial transformation that facilitates the investigation of neutrino phenomenology with a specific flavor structure of the mass matrix. Along with predicting neutrino mass ordering, mixing angles, and CP phases, this framework also provides precise predictions for $\sum m_i$ and $|m_{ee}|$. Specifically, the model predicts $\sum m_i\in (0.073,0.097)$ eV and $\left|m_{ee}\right|\in (3.15,6.66)\times {10}^{-3}$ eV, which are within the reach of forthcoming experiments. Moreover, our model appears promising in addressing lepton flavor violations, including ${\ell }_{\alpha }\to {\ell }_{\beta }\gamma$, ${\ell }_{\alpha }\to 3{\ell }_{\beta }$, and $\mu -e$ conversion rates, while remaining consistent with current experimental limits.

Presentation materials

PPC24_talk.pdf