Abstract
We consider a spin-3/2 fermionic dark matter (DM) particle interacting with the Standard Model quarks through the exchange of a charged and coloured scalar or vector mediator in a simple t-channel model. It is found that for the vector mediator case, almost the entire parameter space allowed by the observed relic density is already ruled out by the direct detection LUX data. No such bounds exist on the interaction mediated by scalar particles. Monojet + missing energy searches at the Large Hadron Collider provide the most stringent bounds on the parameters of the model for this case. The collider bounds put a lower limit on the allowed DM masses.
Highlights
Many astrophysical and cosmological observations during the last several decades provide strong evidence for the existence of dark matter (DM) in the Universe
Interacting massive particle (WIMP) DM searches constitute an important programme at the Large Hadron Collider (LHC), where the ATLAS and CMS collaborations [2] are looking for DM signatures involving missing energy accompanied by a single or two jet events
Spin-3/2 DM with a Higgs portal has been recently investigated [12]. This idea of using a spin-3/2 DM candidate was considered in our recent paper [13], where we considered a minimal Standard Model (SM) singlet spin-3/2 DM candidate interacting with a spin1 mediator in a minimal flavour violation (MFV) s-channel model
Summary
Many astrophysical and cosmological observations during the last several decades provide strong evidence for the existence of dark matter (DM) in the Universe. Interacting massive particle (WIMP) DM searches constitute an important programme at the Large Hadron Collider (LHC), where the ATLAS and CMS collaborations [2] are looking for DM signatures involving missing energy accompanied by a single or two jet events It is expected, and there is a real possibility, that the production of DM particles of any spin at 13 TeV centre-of-mass energy would be detected. Null results from the direct detection experiments [3,4,5,6], which measure nuclear-recoil in DM-nucleon elastic scattering, have provided the most stringent upper bounds on the spin-independent DM-nucleon elastic scattering crosssection over a wide range of DM masses This has provided important constraints on the DM models considered in the literature. Spin-3/2 CDM has been studied in EFT models and constraints from the relic density, direct and indirect observations obtained [7,8,9,10].
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