Low scale leptogenesis with an SU(2)L singlet scalar
Abstract
We consider thermal leptogenesis as the origin of the matter-antimatter asymmetry of the Universe. Some phenomenologically unpleasant features of the usual leptogenesis scenario are reviewed. We propose a minimal alternative, which makes use of a charged scalar δ+, singlet under SU(2)L. Such particle is contained in natural extensions of the Standard Model. The lepton asymmetry is generated by the decays of a right-handed neutrino into δ+ and a right-handed charged lepton and it turns out to be sufficiently large for scales as low as TeV. The phenomenological signatures at colliders are discussed.
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