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The role of leptons in electroweak baryogenesis

de Vries, Jordy ; Postma, Marieke ; van de Vis, Jorinde

The journal of high energy physics, 2019-04, Vol.2019 (4), p.1-41, Article 24 [Periódico revisado por pares]

Berlin/Heidelberg: Springer Berlin Heidelberg

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Título:
The role of leptons in electroweak baryogenesis
Autor: de Vries, Jordy ; Postma, Marieke ; van de Vis, Jorinde
Assuntos: Antimatter ; Asymmetry ; Baryons ; Beyond Standard Model ; Bosons ; Classical and Quantum Gravitation ; Cosmology ; Cosmology of Theories beyond the SM ; Coupling ; CP violation ; Elementary Particles ; Field theory ; Higgs bosons ; Leptons ; Mathematical models ; Matter & antimatter ; Physics ; Physics and Astronomy ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Quarks ; Regular Article - Theoretical Physics ; Relativity Theory ; Standard model (particle physics) ; String Theory
É parte de: The journal of high energy physics, 2019-04, Vol.2019 (4), p.1-41, Article 24
Descrição: A bstract We investigate the role of leptons in electroweak baryogenesis by studying a relatively simple framework inspired by effective field theory that satisfies all Sakharov conditions. In particular, we study the effectiveness of CP-violating source terms induced by dimension-six Yukawa interactions for quarks and charged leptons. Despite the relatively small Yukawa coupling, CP-violating source terms involving taus are quite effective and can account for the observed matter-antimatter asymmetry. We obtain analytical and numerical expressions for the total baryon asymmetry, the former providing important insight into what makes lepton CP violation relatively effective compared to quark CP violation. Leptons also play an important role if the CP-violating source involves top quarks. While the tau Yukawa coupling in the Standard Model is small, it significantly enhances the baryon asymmetry by transferring the chiral asymmetry in quarks, which is washed out by strong sphalerons, to a chiral asymmetry in leptons. We conclude that leptons should not be ignored even if CP violation is limited to the quark sector. The role of leptons can be further increased in scenarios of new physics with additional chiral-symmetry-breaking interactions between quarks and leptons, as can happen in models with additional Higgs bosons or leptoquarks. Finally, we study CP-violating dimension-six Yukawa interactions for lighter quarks and leptons but conclude that these lead to too small baryon asymmetries.
Editor: Berlin/Heidelberg: Springer Berlin Heidelberg
Idioma: Inglês

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The role of leptons in electroweak baryogenesis

de Vries, Jordy ; Postma, Marieke ; van de Vis, Jorinde

Berlin/Heidelberg: Springer Berlin Heidelberg

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