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arXiv · 2211.04403

Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP

Rohan Pramanick·Tirtha Sankar Ray·Avirup Shaw
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Abstract

We introduce a novel hybrid framework combining type I and type II seesaw models for neutrino mass where a complex vacuum expectation value of a singlet scalar field breaks CP spontaneously. Using pragmatic organizing symmetries we demonstrate that such a model can simultaneously explain the neutrino oscillation data and generate observed baryon asymmetry through leptogenesis. Interestingly, natural choice of parameters leads to a mixed leptogenesis scenario driven by nearly degenerate scalar triplet and right handed singlet neutrino fields for which we present a detailed quantitative analysis.

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Rohan Pramanick, Tirtha Sankar Ray, Avirup Shaw. 2022-11-08. Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP. https://doi.org/10.1007/jhep06(2023)099

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