Light sterile neutrinos, dark matter, and new resonances in a U(1) extension of the MSSM
| Autor: | George Lazarides, Aditya Hebbar, Qaisar Shafi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Physics
Particle physics Sterile neutrino 010308 nuclear & particles physics High Energy Physics::Phenomenology Order (ring theory) 01 natural sciences Standard Model Diquark 0103 physical sciences Higgs boson Warm dark matter High Energy Physics::Experiment Neutrino 010306 general physics Minimal Supersymmetric Standard Model |
| Zdroj: | Physical Review D. 96 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.96.055026 |
| Popis: | We present ${\ensuremath{\psi}}^{\ensuremath{'}}$MSSM, a model based on a $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$ extension of the minimal supersymmetric standard model. The gauge symmetry $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$, also known as $U(1{)}_{N}$, is a linear combination of the $U(1{)}_{\ensuremath{\chi}}$ and $U(1{)}_{\ensuremath{\psi}}$ subgroups of ${E}_{6}$. The model predicts the existence of three sterile neutrinos with masses $\ensuremath{\lesssim}0.1\text{ }\text{ }\mathrm{eV}$, if the $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$ breaking scale is of order 10 TeV. Their contribution to the effective number of neutrinos at nucleosynthesis is $\mathrm{\ensuremath{\Delta}}{N}_{\ensuremath{\nu}}\ensuremath{\simeq}0.29$. The model can provide a variety of possible cold dark matter candidates including the lightest sterile sneutrino. If the $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$ breaking scale is increased to $1{0}^{3}\text{ }\text{ }\mathrm{TeV}$, the sterile neutrinos, which are stable on account of a ${Z}_{2}$ symmetry, become viable warm dark matter candidates. The observed value of the standard model Higgs boson mass can be obtained with relatively light stop quarks thanks to the D-term contribution from $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$. The model predicts diquark and diphoton resonances which may be found at an updated LHC. The well-known $\ensuremath{\mu}$ problem is resolved and the observed baryon asymmetry of the universe can be generated via leptogenesis. The breaking of $U(1{)}_{{\ensuremath{\psi}}^{\ensuremath{'}}}$ produces superconducting strings that may be present in our galaxy. A $U(1)$ R symmetry plays a key role in keeping the proton stable and providing the light sterile neutrinos. |
| Databáze: | OpenAIRE |
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