Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-10-13
Phys.Lett. B636 (2006) 278-285
Physics
High Energy Physics
High Energy Physics - Phenomenology
17 pages, 5 figures; version accepted for publication
Scientific paper
10.1016/j.physletb.2006.03.061
We consider the minimal supersymmetric triplet seesaw model as the origin of neutrino masses and mixing as well as of the baryon asymmetry of the Universe, which is generated through soft leptogenesis employing a CP violating phase and a resonant behavior in the supersymmetry breaking sector. We calculate the full gauge--annihilation cross section for the Higgs triplets, including all relevant supersymmetric intermediate and final states, as well as coannihilations with the fermionic superpartners of the triplets. We find that these gauge annihilation processes strongly suppress the resulting lepton asymmetry. As a consequence of this, successful leptogenesis can occur only for a triplet mass at the TeV scale, where the contribution of soft supersymmetry breaking terms enhances the CP and lepton asymmetry. This opens up an interesting opportunity for testing the model in future colliders.
Chun Eung Jin
Scopel Stefano
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