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001     455482
005     20250716150429.0
024 7 _ |a 10.1007/JHEP01(2021)200
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024 7 _ |a Domcke:2020ety
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024 7 _ |a 1029-8479
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024 7 _ |a 1126-6708
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024 7 _ |a arXiv:2009.11678
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100 1 _ |a Domcke, Valerie
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245 _ _ |a MeV-scale Seesaw and Leptogenesis
260 _ _ |a [Trieste]
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520 _ _ |a 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.
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650 _ 7 |a * Automatic Keywords *
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650 _ 7 |a nucleosynthesis: big bang
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650 _ 7 |a neutrino: heavy: decay
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650 _ 7 |a cosmic background radiation: decoupling
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650 _ 7 |a neutrino: heavy
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650 _ 7 |a neutrino: decay
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650 _ 7 |a neutrino: mass
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650 _ 7 |a neutrino: heavy: search for
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650 _ 7 |a neutrino: right-handed
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650 _ 7 |a pi: decay
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650 _ 7 |a pi: mass
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650 _ 7 |a mass: Majorana
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650 _ 7 |a baryon: asymmetry
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650 _ 7 |a leptogenesis
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650 _ 7 |a seesaw model
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650 _ 7 |a nucleus
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650 _ 7 |a Beyond Standard Model
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650 _ 7 |a Cosmology of Theories beyond the SM
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650 _ 7 |a Neutrino Physics
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700 1 _ |a Drewes, Marco
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700 1 _ |a Hufnagel, Marco
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700 1 _ |a Lucente, Michele
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773 _ _ |a 10.1007/JHEP01(2021)200
|g Vol. 01, no. 1, p. 200
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787 0 _ |a Domcke, Valerie Fiona et.al.
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|r arXiv:2009.11678 ; CERN-TH-2020-158 ; DESY-20-159
|t MeV-scale Seesaw and Leptogenesis
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