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MeV-scale Seesaw and Leptogenesis
MeV-scale Seesaw and Leptogenesis
We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments.
Comment: 19 pages, 5 figures, matches published version
- Deutsches Elektronen-Synchrotron DESY Germany
- Helmholtz Association of German Research Centres Germany
- EPFL Switzerland
- École Polytechnique Fédérale de Lausanne Switzerland
- RWTH Aachen University Germany
arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology Nuclear Experiment
Microsoft Academic Graph classification: Baryon asymmetry Physics Pion Particle physics MAJORANA Seesaw molecular geometry Neutrino Leptogenesis Decoupling (cosmology) Big Bang
Dewey Decimal Classification: ddc:530
Library of Congress Subject Headings: lcsh:Nuclear and particle physics. Atomic energy. Radioactivity lcsh:QC770-798
High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, Nuclear and High Energy Physics, beyond standard model, cosmology of theories beyond the sm, neutrino physics, sterile neutrinos, dark-matter, search, masses, baryogenesis, decay, * Automatic Keywords *, big bang [nucleosynthesis], heavy: decay [neutrino], decoupling [cosmic background radiation], heavy [neutrino], decay [neutrino], mass [neutrino], heavy: search for [neutrino], right-handed [neutrino], decay [pi], mass [pi], Majorana [mass], asymmetry [baryon], leptogenesis, seesaw model, nucleus, Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics, astro-ph.CO, Astrophysics and Astronomy, hep-ph, Particle Physics - Phenomenology
High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, Nuclear and High Energy Physics, beyond standard model, cosmology of theories beyond the sm, neutrino physics, sterile neutrinos, dark-matter, search, masses, baryogenesis, decay, * Automatic Keywords *, big bang [nucleosynthesis], heavy: decay [neutrino], decoupling [cosmic background radiation], heavy [neutrino], decay [neutrino], mass [neutrino], heavy: search for [neutrino], right-handed [neutrino], decay [pi], mass [pi], Majorana [mass], asymmetry [baryon], leptogenesis, seesaw model, nucleus, Beyond Standard Model, Cosmology of Theories beyond the SM, Neutrino Physics, astro-ph.CO, Astrophysics and Astronomy, hep-ph, Particle Physics - Phenomenology
arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology Nuclear Experiment
Microsoft Academic Graph classification: Baryon asymmetry Physics Pion Particle physics MAJORANA Seesaw molecular geometry Neutrino Leptogenesis Decoupling (cosmology) Big Bang
Dewey Decimal Classification: ddc:530
Library of Congress Subject Headings: lcsh:Nuclear and particle physics. Atomic energy. Radioactivity lcsh:QC770-798
91110
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[7] M. Chrzaszcz, M. Drewes, T. E. Gonzalo, J. Harz, S. Krishnamurthy, and C. Weniger, A frequentist analysis of three right-handed neutrinos with GAMBIT, Eur. Phys. J. C80 (2020), no. 6 569, [arXiv:1908.02302].
[8] P. Hernandez, M. Kekic, and J. Lopez-Pavon, Ne in low-scale seesaw models versus the lightest neutrino mass, Phys. Rev. D90 (2014), no. 6 065033, [arXiv:1406.2961].
[9] A. Abada, G. Arcadi, V. Domcke, M. Drewes, J. Klaric, and M. Lucente, Low-scale leptogenesis with three heavy neutrinos, JHEP 01 (2019) 164, [arXiv:1810.12463]. [OpenAIRE]
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).11 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).11 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Average influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Average impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Average
Citations provided by BIP!Popularity provided by BIP!
- Deutsches Elektronen-Synchrotron DESY Germany
- Helmholtz Association of German Research Centres Germany
- EPFL Switzerland
- École Polytechnique Fédérale de Lausanne Switzerland
- RWTH Aachen University Germany
- Université Catholique de Louvain Belgium
- Université Catholique de Louvain (UCLouvain) Belgium
- EPFL Switzerland
We study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments.
Comment: 19 pages, 5 figures, matches published version