Probing Non Unitarity of Neutrino Mixing Matrix on Lepton Flavour Violation, Leptogenesis and Neutrino Oscillation Probability | Chapter 9 | New Insights into Physical Science Vol. 13

 Neutrino physics is a mature branch of research, with high precision measurements of all three neutrino mixing angles and two mass squared disparities. Despite several experimental confirmations of neutrino oscillations as well as precise measurements of two mass squared differences and three mixing angles, the unitarity of the leptonic mixing matrix has yet to be determined, leaving room for the possibility of new discoveries. Small non-unitarity effects are present. The bounds on these non-unitarity parameters were derived from existing experimental constraints, on cLFV decays such as,

Via leptogenesis and neutrino oscillation probabilities, we investigate their impact on baryon asymmetry generation. We consider a model in which the see-saw is extended by a singlet S that is very light but can cause non-unitarity effects without affecting the see-saw formula's structure. We perform a parameter scan of a minimal see-saw model in a type I see-saw system that satisfies Planck data on the Universe's baryon to photon ratio, which falls within the interval,

For one flavour leptogenesis, we predict values of lightest neutrino mass, Dirac and Majorana CP-violating phase _CP, and, for regular and inverted hierarchy. It's worth noting that none of these four quantities are understood yet, and they'll be measured in future experiments. Future neutrino experiments involving the Dirac CPV process will confirm or refute some of the findings presented here. Our presentation in this paper only serves as a benchmark for future model-building research.

Author (s) Details

Assistant Professor Dr. Gayatri Ghosh
Department of Physics, Gauhati University Guwahati-781014, Assam, India.

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