A possible relation between leptogenesis and PMNS phases

The CP phase relevant in the leptogenesis is related to the PMNS phase in case only one CP phase appears in the full theory. Thus, the CP phase is introduced by spontaneous CP violation at a high energy scale toward realizing the successful Kobayashi-Maskawa electroweak CP violation. This phase is i...

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Detalles Bibliográficos
Autores principales: Covi, Laura, Kim, Jihn E., Kyae, Bumseok, Nam, Soonkeon
Lenguaje:eng
Publicado: 2016
Materias:
Particle Physics - Phenomenology
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.94.065004
http://cds.cern.ch/record/2118995
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author Covi, Laura
Kim, Jihn E.
Kyae, Bumseok
Nam, Soonkeon
author_facet Covi, Laura
Kim, Jihn E.
Kyae, Bumseok
Nam, Soonkeon
author_sort Covi, Laura
collection CERN
description The CP phase relevant in the leptogenesis is related to the PMNS phase in case only one CP phase appears in the full theory. Thus, the CP phase is introduced by spontaneous CP violation at a high energy scale toward realizing the successful Kobayashi-Maskawa electroweak CP violation. This phase is in a complex vacuum expectation value of a standard model singlet field. We find new $W$ boson exchange diagrams for leptogenesis. Assuming that the lightest (intermediate scale) Majorana lepton $N_0$ dominates the lepton asymmetry, the lepton asymmetry and the PMNS phase are related.
id cern-2118995
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2016
record_format invenio
spelling cern-21189952023-03-14T18:35:24Zdoi:10.1103/PhysRevD.94.065004http://cds.cern.ch/record/2118995engCovi, LauraKim, Jihn E.Kyae, BumseokNam, SoonkeonA possible relation between leptogenesis and PMNS phasesParticle Physics - PhenomenologyAstrophysics and AstronomyParticle Physics - PhenomenologyThe CP phase relevant in the leptogenesis is related to the PMNS phase in case only one CP phase appears in the full theory. Thus, the CP phase is introduced by spontaneous CP violation at a high energy scale toward realizing the successful Kobayashi-Maskawa electroweak CP violation. This phase is in a complex vacuum expectation value of a standard model singlet field. We find new $W$ boson exchange diagrams for leptogenesis. Assuming that the lightest (intermediate scale) Majorana lepton $N_0$ dominates the lepton asymmetry, the lepton asymmetry and the PMNS phase are related.We propose a new scenario for baryogenesis through leptogenesis, where the CP phase relevant for leptogenesis is connected directly to the Pontecorvo-Maki-Nakagawa-Sakada (PMNS) phase(s) in the light neutrino mixing matrix. The scenario is realized in the case when only one CP phase appears in the full theory, originating from the complex vacuum expextation value of a standard model singlet field. In order to realize this scheme, the electroweak symmetry is required to be broken during the leptogenesis era, and a new loop diagram with an intermediate W boson exchange including the low-energy neutrino mixing matrix should play the dominant contribution to the CP violation for leptogenesis. In this article, we discuss the new basic mechanism, which we call type-II leptogenesis, and give an estimate for maximally reachable baryon asymmetry depending on the PMNS phases.We propose a new scenario for baryogenesis through leptogenesis, where the CP phase relevant for leptogenesis is connected directly to the PMNS phase(s) in the light neutrino mixing matrix. The scenario is realized in case only one CP phase appears in the full theory, originating from the complex vacuum expextation value of a standard model singlet field. In order to realize this scheme, the electroweak symmetry is required to be broken during the leptogenesis era and a new loop diagram with an intermediate $W$ boson exchange including the low energy neutrino mixing matrix should play the dominant contribution to the CP violation for leptogenesis. In this letter, we discuss the new basic mechanism, which we call type-II leptogenesis, and give an estimate for maximally reachable baryon asymmetry depending on the PMNS phases.arXiv:1601.00411oai:cds.cern.ch:21189952016-01-04
spellingShingle Particle Physics - Phenomenology
Astrophysics and Astronomy
Particle Physics - Phenomenology
Covi, Laura
Kim, Jihn E.
Kyae, Bumseok
Nam, Soonkeon
A possible relation between leptogenesis and PMNS phases
title A possible relation between leptogenesis and PMNS phases
title_full A possible relation between leptogenesis and PMNS phases
title_fullStr A possible relation between leptogenesis and PMNS phases
title_full_unstemmed A possible relation between leptogenesis and PMNS phases
title_short A possible relation between leptogenesis and PMNS phases
title_sort possible relation between leptogenesis and pmns phases
topic Particle Physics - Phenomenology
Astrophysics and Astronomy
Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.94.065004
http://cds.cern.ch/record/2118995
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