Phenomenological Aspects of the SSM
arXiv:1201.5488
Abstract
The inert neutralino sector of the SSM and the dark matter that naturally arises from this sector is studied for the first time. Limits on the parameter space from experimental and cosmological observations relating to the inert neutralino dark matter are explored and the consequences for Higgs boson phenomenology are investigated. In plausible scenarios it is found that the couplings of the lightest inert neutralinos to the SM-like Higgs boson are always rather large. This has major implications for Higgs boson collider phenomenology and leads to large spin-independent LSP-nucleon cross-sections. Because of the latter, scenarios in which SSM inert neutralinos account for all of the observed dark matter are now severely challenged by recent dark matter direct detection experiment analyses. In plausible scenarios consistent with observations from both cosmology and LEP the lightest inert neutralino is required to have a mass around half of the Z boson mass if it contributes to cold dark matter and this means that cannot be too large. A new variant of the SSM called the SSM is also presented in which the dark matter scenario is very different to the inert neutralino cold dark matter scenario and in which the presence of supersymmetric massless states in the early universe modifies the expansion rate of the universe prior to Big Bang Nucleosynthesis. The new dark matter scenario is consistent with current observations and the modified expansion rate provides a better explanation of various data than the SM prediction. The prospects for a warm dark matter scenario in the SSM are also briefly discussed.
phd thesis
References in corpus (23)
- Double Beta Decay, Majorana Neutrinos, and Neutrino Mass
- Asymmetric Dark Matter
- First Dark Matter Results from the XENON100 Experiment
- Hadronic Uncertainties in the Elastic Scattering of Supersymmetric Dark Matter
- A lower bound on the mass of Dark Matter particles
- Nonstandard Higgs Boson Decays
- Z' physics with early LHC data
- Search for dilepton resonances in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
- Neutron lifetime measurements using gravitationally trapped ultracold neutrons
- Gauge Coupling Unification in the Exceptional Supersymmetric Standard Model
- Minimal E_6 Supersymmetric Standard Model
- Natural Dark Matter in SUSY GUTs with Non-universal Gaugino Masses
- Leptogenesis in the Exceptional Supersymmetric Standard Model: flavour dependent lepton asymmetries
- Search for the Higgs boson in the H->WW(*)->lvlv decay channel in pp collisions at sqrt(s) = 7 TeV with the ATLAS detector
- A New 76Ge Double Beta Decay Experiment at LNGS
- Novel Higgs Decays and Dark Matter in the E(6)SSM
- Theoretical upper bound on the mass of the LSP in the MNSSM
- Search for the Standard Model Higgs boson in the decay channel H->ZZ(*)->4l with the ATLAS detector
- Search for the Standard Model Higgs boson in the two photon decay channel with the ATLAS detector at the LHC
- The NEXT-100 experiment for neutrinoless double beta decay searches (Conceptual Design Report)
- Search for a Standard Model Higgs boson in the H->ZZ->llnunu decay channel with the ATLAS detector
- Search for a heavy Standard Model Higgs boson in the channel H->ZZ->llqq using the ATLAS detector
- A Search for ttbar Resonances in the Dilepton Channel in 1.04 fb^-1 of pp collisions at sqrt(s) = 7 TeV with the ATLAS experiment