Leptogenesis and LHC Physics With Type Iii See-Saw

Abstract

The See-Saw mechanism provides a nice way to explain why neutrino masses are so much lighter than their charged lepton partners. It also provides a nice way to explain baryon asymmetry in our universe via the leptogenesis mechanism. In this talk we review leptogenesis and LHC physics in a See-Saw model proposed in 1989, now termed the Type III See-Saw model. In this model, SU (2) L triplet leptons are introduced with the neutral particles of the triplets playing the role of See-Saw. The triplet leptons have charged partners with standard model gauge interactions resulting in many new features. The gauge interactions of these particles make it easier for leptognesis with low masses, as low as a TeV is possible. The gauge interactions also make the production and detection of triplet leptons at LHC possible. The See-Saw mechanism and leptogenesis due to Type III See-Saw may be tested at LHC. Keywords:Type III see-saw; neutrino; triplet lepton; leptogenesis; LHC. See-Saw MechanismThe canonical See-Saw mechanism 1 refers to the neutrino mass matrix of the formIf the eigenvalues of M R are much larger than those of m D , the light and heavy neutrinos mass matrix are given byFor one generation, the light neutrino mass isThe suppression factor m D /M R makes the light neutrino mass much smaller than the usual Dirac mass m D which is of order the charged lepton mass. This is a very nice way to explain why light neutrino masses are so much lighter than their charged partners.

Neutrino mixing and Leptogenesis with modular $S_3$ symmetry in the framework of type III seesaw

“…Thus bringing down the scale of leptogenesis as low as TeV through resonance enhancement, is proven to be an attractive scenario, which may opens up exciting options in the future experiments [63][64][65][66]. Obtaining a finite CP asymmetry from the decay of right-handed neutrinos within the simplistic framework of type I seesaw is well explored, however leptogenesis with type III seesaw is less frequented in the literature [52,67,68]. Thus in the present context, we focus on the generation of asymmetry from the decay of lightest Here,…”

“…Also the type III seesaw scenario within S 3 symmetry is less frequented as compared to the type I and type II mechanisms. Moreover there exist immense literature on the generic scenario of leptogenesis within the framework of type I and II seesaw but very few studies explore the same in type III case [43][44][45][46][47][48][49][50][51][52]. Therefore in the present work we explore neutrino masses and mixing within the framework of type III seesaw with implication of modular S 3 group.…”

Common origin of radiative neutrino mass, dark matter and leptogenesis in scotogenic Georgi-Machacek model

“…This discrepancy in SM also calls for theories beyond the SM. Neutrino masses can indeed be generated by various see-saw mechanisms [3][4][5][6][7][8][9][10][11][12][13] at tree level with new heavy fermions and scalar fields, which can also generate matter-antimatter asymmetry in the Universe through the leptogenesis mechanism [14][15][16][17][18].…”