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

TL;DR

This paper investigates a spin-3/2 singlet dark matter candidate, analyzing its interactions and constraints from collider, direct detection, and cosmic ray data, finding that the interaction scale must be above tens of TeV for masses between 10 GeV and 1 TeV.

Contribution

It provides a comprehensive phenomenological analysis of a spin-3/2 singlet dark matter particle, deriving constraints from multiple experimental avenues.

Findings

Collider searches constrain low-mass DM interactions.

Cosmic ray data set bounds for heavy DM.

Direct detection is most effective at intermediate masses.

Abstract

We consider the proposal that dark matter (DM) is composed of a spin-3/2 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. For DM mass of order 10 GeV to 1 TeV, the effective interaction scale is constrained to be typically above a few tens TeV.