Low scale leptogenesis with an SU(2)_L singlet scalar

Details Low scale leptogenesis with an SU(2)_L singlet scalar Low scale leptogenesis with an SU(2)_L singlet scalar

2006-10-17

arxiv.org/abs/hep-ph/0610211v2

ECONFC0605151:0021,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 2 epsi figures, revtex4.cls, slac_two.rtx; talk presented at the IPM Conference on Lepton and Hadron Physics, Tehran,

Scientific paper

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 $\delta^+$, 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 $\delta^+$ and a right-handed charged lepton and it turns out to be sufficiently large for scales as low as $\sim$ TeV. The phenomenological signatures at colliders are discussed.

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