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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Acknowledgments
We thank Mainak Chakraborty for discussions. RP acknowledges MHRD, Government of India for the research fellowship. AS acknowledges the financial support from Department of Science and Technology, Government of India through SERB-NPDF scholarship with grant no.:PDF/2020/000245. The authors also acknowledge the National Supercomputing Mission (NSM) for providing computing resources of ‘PARAM Shakti’ at IIT Kharagpur, which is implemented by C-DAC and supported by the Ministry of Electronics and Information Technology (MeitY) and Department of Science and Technology (DST), Government of India.
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Pramanick, R., Ray, T.S. & Shaw, A. Neutrino mass and leptogenesis in a hybrid seesaw model with a spontaneously broken CP. J. High Energ. Phys. 2023, 99 (2023). https://doi.org/10.1007/JHEP06(2023)099
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DOI: https://doi.org/10.1007/JHEP06(2023)099