2007/04/30 by Stefan Antusch
Biochemistry, Genetics and Molecular Biology · Nursing · Physics and Astronomy · #Bacterial Genetics and Biotechnology #Biochemical Analysis and Sensing Techniques #RNA and protein synthesis mechanisms #hep-ph
paper · pdf · doi:10.1103/physrevd.76.023512
published as Phys.Rev.D76:023512,2007 · 19 pages, 8 figures; v3: minor additions, typos corrected, results and conclusions unchanged
openalex publication_date 2007/07/23 · arxiv created 2008/09/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We reanalyze leptogenesis via the out-of-equilibrium decay of the lightest right-handed neutrino in type II seesaw scenarios, taking into account flavor-dependent effects. In the type II seesaw mechanism, in addition to the type I seesaw contribution, an additional direct mass term for the light neutrinos is present. We consider type II seesaw scenarios where this additional contribution arises from the vacuum expectation value of a Higgs triplet, and furthermore an effective model-independent approach. We investigate bounds on the flavor-specific decay asymmetries, on the mass of the lightest right-handed neutrino and on the reheat temperature of the early universe, and compare them to the corresponding bounds in the type I seesaw framework. We show that while flavor-dependent thermal type II leptogenesis becomes more efficient for larger mass scale of the light neutrinos, and the bounds become relaxed, the type I seesaw scenario for leptogenesis becomes more constrained. We also argue that in general, flavor-dependent effects cannot be ignored when dealing with leptogenesis in type II seesaw models.