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Publication . Article . Other literature type . Research . Preprint . 2020

MeV-scale Seesaw and Leptogenesis

Valerie Domcke; Marco Drewes; Marco Hufnagel; Michele Lucente;
Open Access

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.

Journal of high energy physics 01(1), 200 (2021). doi:10.1007/JHEP01(2021)200

Published by SISSA, [Trieste]

Subjects by Vocabulary

arXiv: High Energy Physics::Experiment High Energy Physics::Phenomenology Nuclear Experiment

Dewey Decimal Classification: ddc:530

Microsoft Academic Graph classification: Baryon asymmetry Decoupling (cosmology) Big Bang MAJORANA Physics Pion Particle physics Leptogenesis Seesaw molecular geometry Neutrino

Library of Congress Subject Headings: lcsh:Nuclear and particle physics. Atomic energy. Radioactivity lcsh:QC770-798


astro-ph.CO, Astrophysics and Astronomy, hep-ph, Particle Physics - Phenomenology, Nuclear and High Energy Physics, * 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, 530, beyond standard model, cosmology of theories beyond the sm, neutrino physics, sterile neutrinos, dark-matter, search, masses, baryogenesis, decay, High Energy Physics - Phenomenology, Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology (hep-ph), Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, * Automatic Keywords *, nucleosynthesis: big bang, neutrino: heavy: decay, cosmic background radiation: decoupling, neutrino: heavy, neutrino: decay, neutrino: mass, neutrino: heavy: search for, neutrino: right-handed, pi: decay, pi: mass, mass: Majorana, baryon: asymmetry, leptogenesis, seesaw model, nucleus

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Funded by
EC| NewAve
New avenues towards solving the dark matter puzzle
  • Funder: European Commission (EC)
  • Project Code: 638528
  • Funding stream: H2020 | ERC | ERC-STG