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Scalar-singlet assisted leptogenesis with CP violation from the vacuum

2023-01-03Journal article Open access
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dc.contributor.authorBarreiros, Debora
dc.contributor.authorCâmara, Henrique B.
dc.contributor.authorGonzalez Felipe, Ricardo
dc.contributor.authorJoaquim, Filipe
dc.date.accessioned2023-05-15T10:53:21Z
dc.date.available2023-05-15T10:53:21Z
dc.date.issued2023-01-03
dc.description.abstractIn the vanilla type-I seesaw leptogenesis scenario, CP violation required to generate the lepton asymmetries in the heavy Majorana neutrino decays stem from complex Dirac-type Yukawa couplings. In this paper we explore the case in which that CP violation originates from the vacuum expectation value of a complex scalar singlet at a very high scale. This non-trivial CP-violating phase can be successfully communicated to the low-energy neutrino sector via the heavy neutrino portal. The new scalar-singlet degrees of freedom generate new contributions to the CP asymmetries relevant for leptogenesis not only at the one-loop level but also through tree-level three-body decays. These are computed here for an arbitrary number of heavy neutrinos, Higgs doublets and scalar singlets. We also take into account the new decays and scattering processes that enter the unflavoured Boltzmann equations governing the heavy-neutrino particle densities and the (B - L)-asymmetry evolution. Having established the framework of interest, we present a simple model with two RH neutrinos, two Higgs doublets and a complex scalar singlet, supplemented with a ?(8) flavour symmetry. This symmetry minimises the number of free parameters without compromising the possibility of spontaneous CP violation and compatibility with neutrino data. In fact, the only viable ?(8) charge assignment shows a preference for a non-trivial spontaneous CP-violating phase, which in turn leads to a non-vanishing CP asymmetry due to the direct link between high- and low-energy CP violation. An interesting feature of this simple setup is that the usual wave and vertex type-I seesaw contributions to the CP asymmetry vanish due to the ?(8) symmetry. Thus, the observed baryon-to-photon ratio can be explained thanks to the new couplings among the heavy neutrinos and the new scalar degrees of freedom.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBARREIROS, D. M.; [et al] – Scalar-singlet assisted leptogenesis with CP violation from the vacuum. Journal of High Energy Physics. ISSN 1029-8479. N.º 1 (2023), pp. 1-44.pt_PT
dc.identifier.doi10.1007/JHEP01(2023)010pt_PT
dc.identifier.issn1029-8479
dc.identifier.urihttp://hdl.handle.net/10400.21/16029
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationCenter for Theoretical Particle Physics
dc.relationCenter for Theoretical Particle Physics
dc.relation.publisherversionhttps://link.springer.com/article/10.1007/JHEP01(2023)010pt_PT
dc.subjectBaryo-and leptogenesispt_PT
dc.subjectCP violationpt_PT
dc.subjectFlavour symmetriespt_PT
dc.subjectNeutrino mixingpt_PT
dc.titleScalar-singlet assisted leptogenesis with CP violation from the vacuumpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCenter for Theoretical Particle Physics
oaire.awardTitleCenter for Theoretical Particle Physics
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00777%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F00777%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/CERN%2FFIS-PAR%2F0004%2F2019/PT
oaire.citation.endPage44pt_PT
oaire.citation.issue1pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleJournal of High Energy Physicspt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream3599-PPCDT
person.familyNameBarreiros
person.familyNameGonzalez Felipe
person.familyNameRafael Joaquim
person.givenNameDébora
person.givenNameRicardo
person.givenNameFilipe
person.identifier.ciencia-id2719-4B02-4B2A
person.identifier.ciencia-id481B-F248-D189
person.identifier.ciencia-id551D-6D20-8323
person.identifier.orcid0000-0001-7771-2987
person.identifier.orcid0000-0003-3563-6626
person.identifier.orcid0000-0002-6711-4606
person.identifier.ridA-3071-2009
person.identifier.scopus-author-id8914041100
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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