Distinctive signals of frustrated dark matter

A bstract We study a renormalizable model of Dirac fermion dark matter (DM) that communicates with the Standard Model (SM) through pair mediators — one scalar, in representation ( 6 , 1 $$ \frac{4}{3} 4 3 ) SM gauge group SU(3) c × SU(2) L U(1) Y . While such assignments preclude direct coupling to at tree level, we examine many effective operators generated one-loop order when are heavy, and find they often phenomenologically relevant. reinterpret dijet pair-produced resonance jets + {E}_{\mathrm{T}}^{\mathrm{miss}} E T miss searches Large Hadron Collider (LHC) constrain mediator sector, an array DM constraints ranging from observed relic density Ω χ {h}_{\mathrm{Planck}}^2 h Planck 2 indirect for matter. Tree-level annihilation, available masses starting TeV scale, is required produce freeze-out, but loops led by dimension-five magnetic dipole moment nonetheless able signals large enough be constrained, particularly XENON1T experiment. In some benchmarks, fair amount parameter space left open experiment compatible freeze-out. other scenarios, however, quite small, suggesting need further model-building and/or non-standard cosmologies.