Majorana dark matter in a classically scale invariant model
| Autor: | Sanjin Benić, Branimir Radovčić |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Particle physics
Nuclear and High Energy Physics High Energy Physics::Lattice Bare mass Dark matter FOS: Physical sciences Astrophysics::Cosmology and Extragalactic Astrophysics 7. Clean energy 01 natural sciences Standard Model High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences Beyond Standard Model Higgs Physics 010306 general physics Physics Gauge boson 010308 nuclear & particles physics High Energy Physics::Phenomenology Higgs physics Fermion NATURAL SCIENCES. Physics PRIRODNE ZNANOSTI. Fizika High Energy Physics - Phenomenology MAJORANA Higgs boson Anomaly (physics) beyond standard model |
| Zdroj: | Journal of High Energy Physics Volume 2015 Issue 1 |
| ISSN: | 1126-6708 1029-8479 |
| Popis: | We analyze a classically scale invariant extension of the Standard Model with dark gauge $U(1)_X$ broken by doubly charge scalar $\Phi$ leaving a remnant $Z_2$ symmetry. Dark fermions are introduced as dark matter candidates and for anomaly reasons we introduce two chiral fermions. Due to classical scale invariance, bare mass term that would mix these two states is absent and they end up as stable Majorana fermions $N_1$ and $N_2$. We calculate cross sections for $N_aN_a \to \phi\phi$, $N_aN_a \to X^\mu \phi$ and $N_2N_2 \to N_1N_1$ annihilation channels. We put constraints to the model from the Higgs searches at the LHC, dark matter relic abundance and dark matter direct detection limits by LUX. The dark gauge boson plays a crucial role in the Coleman-Weinberg mechanism and has to be heavier then 680 GeV. The viable mass region for dark matter is from 470 GeV up to a few TeV. In the case when two Majorana fermions have different masses, two dark matter signals at direct detection experiments could provide a distinctive signature of this model. Comment: new references added, minor changes in text, matches the published version |
| Databáze: | OpenAIRE |
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