Comprehensive Constraints on a Spin-3/2 Singlet Particle as a Dark Matter Candidate

Feb 17, 2013
24 pages
Published in:
  • JCAP 05 (2013) 028
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Abstract: (IOP)
We consider the proposal that dark matter (DM) is composed of a spin-3/2 Dirac-type particle that is a singlet of the standard model (SM). Its leading effective interactions with ordinary matter involve a pair of their fields and a pair of SM fermions, in the form of products of chiral currents. We make a comprehensive analysis on possible phenomenological effects of the interactions in various experiments and observations. These include collider searches for monojet plus missing transverse energy events, direct detections of DM scattering off nuclei, possible impacts on the gamma rays and antiproton-to-proton flux ratio in cosmic rays, and the observed relic density. The current data already set strong constraints on the effective interactions in a complementary manner. The constraint from collider searches is most effective at a relatively low mass of DM, and the antiproton-to-proton flux ratio offers the best bound for a heavy DM, while the spin-independent direct detection is the best in between. Putting all constraints together, a DM mass less than ~ 1TeV has been excluded, leaving behind a small window for a heavy DM particle of spin-3/2.
Note:
  • 24 pages, 10 figures
  • dark matter: mass
  • parton: flux
  • dark matter: direct detection
  • dark matter: scattering
  • dark matter: heavy
  • singlet: 2
  • transverse energy: missing-energy
  • jet: single production
  • cosmic radiation
  • relic density