Leptonic CP asymmetry and Light flavored scalar

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.

arXiv comment30 pages, 10 figures, 1 table, version to appear in JHEP

References in corpus (9)

• Oscillating neutrinos and mu --> e, gamma
• Baryogenesis through leptogenesis
• Dirac or Inverse Seesaw Neutrino Masses with $B-L$ Gauge Symmetry and $S_3$ Flavour Symmetry
• Leptogenesis at the TeV scale
• Some Aspects of Thermal Leptogenesis
• A new mechanism for matter-antimatter asymmetry and connection with dark matter
• Aspects of High Scale Leptogenesis with Low-Energy Leptonic CP Violation
• Leptogenesis and the Higgs Portal
• Deep Correlation Between Cosmic-Ray Anomaly and Neutrino Masses