Mecanismos de baixa escala para geração de massa de neutrinos a partir de extensõe...
Invariância de escala clássica, matéria escura e neutrinos no modelo SU(3)_L x U(1...
Texto completo | |
Autor(es): |
Agashe, Kaustubh
;
Du, Peizhi
;
Ekhterachian, Majid
;
Fong, Chee Sheng
;
Hong, Sungwoo
;
Vecchi, Luca
Número total de Autores: 6
|
Tipo de documento: | Artigo Científico |
Fonte: | Journal of High Energy Physics; v. N/A, n. 4, p. 76-pg., 2019-04-03. |
Resumo | |
We develop an extension of the basic inverse seesaw model which addresses simultaneously two of its drawbacks, namely, the lack of explanation of the tiny Majorana mass term for the TeV-scale singlet fermions and the difficulty in achieving successful leptogenesis. Firstly, we investigate systematically leptogenesis within the inverse (and the related linear) seesaw models and show that a successful scenario requires either small Yukawa couplings, implying loss of experimental signals, and/or quasi-degeneracy among singlets mass of different generations, suggesting extra structure must be invoked. Then we move to the analysis of our new framework, which we refer to as hybrid seesaw. This combines the TeV degrees of freedom of the inverse seesaw with those of a high-scale (M-N >> TeV) seesaw module in such a way as to retain the main features of both pictures: naturally small neutrino masses, successful leptogenesis, and accessible experimental signatures. We show how the required structure can arise from a more fundamental theory with a gauge symmetry or from warped extra dimensions/composite Higgs. We provide a detailed derivation of all the analytical formulae necessary to analyze leptogenesis in this new framework, and discuss the entire gamut of possibilities our scenario encompasses including scenarios with singlet masses in the enlarged range M-N approximate to 10(6) - 10(16) GeV. This idea of hybrid seesaw was proposed by us in arXiv:1804.06847; here, we substantially elaborate upon and extend earlier results. (AU) | |
Processo FAPESP: | 17/02747-7 - Enfrentando enigmas de física nos modelos Mirror Twin Higgs |
Beneficiário: | Chee Sheng Fong |
Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |