Abstract
We consider a situation where right-handed neutrinos couple to a light scalar which is possibly a Nambu-Goldstone boson resulting from high-energy symmetry breaking. Its coupling is typically complex-valued and flavor-dependent. In this work, we investigate the possibility of the leptonic asymmetry generation in the Universe from the right-handed neutrino decay to flavorful light scalar. Furthermore a new source of asymmetry generation from a single decay process is pointed out, which is characteristic of the present setting.
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Abe, Y., Ito, T. & Yoshioka, K. Leptonic CP asymmetry and Light flavored scalar. J. High Energ. Phys. 2023, 19 (2023). https://doi.org/10.1007/JHEP01(2023)019
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DOI: https://doi.org/10.1007/JHEP01(2023)019