Dirac neutrino mass generation from a Majorana messenger
| Autor: | Óscar Zapata, Julián Calle, Diego Restrepo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Particle physics Gauge boson 010308 nuclear & particles physics High Energy Physics::Lattice Mass generation Scalar (mathematics) High Energy Physics::Phenomenology FOS: Physical sciences Fermion 01 natural sciences Computer Science::Digital Libraries MAJORANA High Energy Physics - Phenomenology High Energy Physics - Phenomenology (hep-ph) Seesaw molecular geometry 0103 physical sciences High Energy Physics::Experiment Neutrino 010306 general physics Gauge symmetry |
| Zdroj: | Physical Review |
| Popis: | The radiative type-I seesaw has been already implemented to explain the lightness of Majorana neutrinos with both Majorana and Dirac heavy fermions, and the lightness of Dirac neutrinos with Dirac heavy fermions. In this work we present a minimal implementation of the radiative type-I seesaw with light Dirac neutrinos and heavy Majorana fermions. An inert doublet and a complex singlet scalar complete the dark sector which is protected by an Abelian fermiophobic gauge symmetry that also forbids tree level mass contributions for the full set of light neutrinos. A fermion vector-like extension of the model is also proposed where the light right-handed neutrinos can thermalize in the primordial plasma and the extra gauge boson can be directly produced at colliders. In particular, the current upper bound on $\Delta N_{\text{eff}}$ reported by PLANCK points to large ratios $M_{Z'}/g'\gtrsim 40\ \text{TeV}$ which can be competitive with collider constraint for $g'$ sufficiently large in the ballpark of the Standard Model values, while future cosmic microwave background experiments may probe all the no minimal models presented here. Comment: Code available at https://github.com/restrepo/DiracMajorana 17 pages, 4 figures, 2 tables |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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