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000449168 037__ $$aPUBDB-2020-03620
000449168 041__ $$aEnglish
000449168 088__ $$2arXiv$$aarXiv:2009.11678
000449168 088__ $$2CERN$$aCERN-TH-2020-158
000449168 088__ $$2DESY$$aDESY-20-159
000449168 1001_ $$0P:(DE-H253)PIP1013967$$aDomcke, Valerie Fiona$$b0$$eCorresponding author
000449168 245__ $$aMeV-scale Seesaw and Leptogenesis
000449168 260__ $$c2020
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000449168 520__ $$aWe study the type-I seesaw model with three right-handed neutrinos and Majorana masses below the pion mass. In this mass range, the model parameter space is not only strongly constrained by the requirement to explain the light neutrino masses, but also by experimental searches and cosmological considerations. In the existing literature, three disjoint regions of potentially viable parameter space have been identified. In one of them, all heavy neutrinos decay shortly before big bang nucleosynthesis. In the other two regions, one of the heavy neutrinos either decays between BBN and the CMB decoupling or is quasi-stable. We show that previously unaccounted constraints from photodisintegration of nuclei practically rule out all relevant decays that happen between BBN and the CMB decoupling. Quite remarkably, if all heavy neutrinos decay before BBN, the baryon asymmetry of the universe can be quite generically explained by low-scale leptogenesis, i.e. without further tuning in addition to what is needed to avoid experimental and cosmological constraints. This motivates searches for heavy neutrinos in pion decay experiments.
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000449168 650_7 $$2autogen$$anucleosynthesis: big bang
000449168 650_7 $$2autogen$$aneutrino: heavy: decay
000449168 650_7 $$2autogen$$acosmic background radiation: decoupling
000449168 650_7 $$2autogen$$aneutrino: heavy
000449168 650_7 $$2autogen$$aneutrino: decay
000449168 650_7 $$2autogen$$aneutrino: mass
000449168 650_7 $$2autogen$$aneutrino: heavy: search for
000449168 650_7 $$2autogen$$aneutrino: right-handed
000449168 650_7 $$2autogen$$api: decay
000449168 650_7 $$2autogen$$api: mass
000449168 650_7 $$2autogen$$amass: Majorana
000449168 650_7 $$2autogen$$abaryon: asymmetry
000449168 650_7 $$2autogen$$aleptogenesis
000449168 650_7 $$2autogen$$aseesaw model
000449168 650_7 $$2autogen$$anucleus
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000449168 7001_ $$aDrewes, Marco$$b1
000449168 7001_ $$0P:(DE-H253)PIP1032760$$aHufnagel, Marco$$b2
000449168 7001_ $$aLucente, Michele$$b3
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