Abstract
We consider a spin-3/2 fermionic dark matter candidate (DM) interacting with Standard Model fermions through a vector mediator in the s-channel. We find that for pure vector couplings almost the entire parameter space of the DM and mediator mass consistent with the observed relic density is ruled out by the direct detection observations through DM-nucleon elastic scattering cross sections. In contrast, for pure axial-vector coupling, the most stringent constraints are obtained from monojet searches at the Large Hadron Collider.
Highlights
A large number of cosmological and astrophysical observations provide strong evidence for the existence of dark matter (DM) in the universe
In this paper we have considered a spin-3/2 DM particle interacting with Standard Model (SM) fermions through a vector mediator in the schannel
In view of the spin-3/2 nature of the DM, in addition to the restriction on the coupling arising from the decay width, there exists a minimum value of the DM mass for a given coupling and mediator mass
Summary
A large number of cosmological and astrophysical observations provide strong evidence for the existence of dark matter (DM) in the universe. Effective field theories (EFT) in which the DM-SM interactions are mediated by heavy particles, which are not accessible at the LHC energies, have been analysed in detail with limits from direct and indirect searches. Spin-3/2 CDM has been studied in EFT models, and constraints from direct and indirect observations obtained [12–15]. Spin-3/2, 7.1 keV warm dark matter (WDM) has been considered as a means to provide a viable explanation from the anomalous 3.1 KeV Xray line observed by the XMM Newton [16]. As such we shall introduce the spin-3/2 CDM in an MFV s-channel model in Sect. We further let χ to be a SM singlet which interacts
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