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Purely Flavored Leptogenesis · Around

2009

Purely Flavored Leptogenesis

Sierra, D. Aristizabal, Muñoz, Luis Alfredo, Nardi, Enrico

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We study a model for leptogenesis in which the total CP asymmetries in the decays and scatterings involving the SU(2) singlet seesaw neutrinos $N_\alpha$ vanish ($\epsilon_{N_\alpha}=0$).

Leptogenesis is possible due to non-vanishing CP violating lepton flavor asymmetries, realizing a situation in which the baryon asymmetry is due exclusively to flavor effects.
We study the production of a net lepton asymmetry by solving the Boltzmann equations specific to this model, and we show that successful leptogenesis can be obtained at a scale as low as the TeV.
We also discuss constraints on the model parameter space arising from current experimental upper limits on lepton flavor violating decays.

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A. Strumia, arXiv:hep-ph/0608347; E. Nardi, arXiv:hep-ph/0702033; Y. Nir, arXiv:hep-ph/0702199; M. C. Chen, arXiv:hep-ph/0703087; E. Nardi, arXiv:0706.0487 [hep-ph]

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‘MEG collaboration home page: http://meg.web.psi.ch/index.html

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