Leptogenesis in the mu tau basis

Autor(es)

Nishi, Celso C. ; Fong, Chee Sheng

• Tipo de documento: Artigo Científico
• Fonte: Journal of High Energy Physics; v. N/A, n. 7, p. 33-pg., 2020-07-21.

Resumo

We formulate three-flavor type-I leptogenesis in the mu tau basis which is convenient because in the three-flavor regime, both mu and tau charged lepton Yukawa interactions are in thermal equilibrium and the thermal bath is symmetric under the exchange mu <-> tau. We apply this formalism to models with mu tau-reflection CP mu tau symmetry. We confirm the previous result that leptogenesis fails in the three-flavor regime with exact CP mu tau symmetry. Allowing CP mu tau symmetry to be broken to various degrees, we show that leptogenesis can be successful in the three-flavor regime only in certain tuned parameter space, which could further imply additional symmetry is at play. As a bonus, we derive analytical expressions which could be utilized whenever the branching ratios for the decays to mu and tau flavors are equal or approximately so. (AU)

• Processo FAPESP: 19/11197-6 - Teste de precisão de bariogênese
• Beneficiário: Chee Sheng Fong
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 14/19164-6 - Desafios para o século XXI em física e astrofísica de neutrinos
• Beneficiário: Orlando Luis Goulart Peres
• Modalidade de apoio: Auxílio à Pesquisa - Projetos Especiais