Is the dark matter particle its own antiparticle?

Understand

We propose a test based on direct detection data that allows to determine if the dark matter particle is different from its antiparticle.

• The test requires the precise measurement of the dark matter spin-independent direct detection cross sections off $\mathrm{three}$ different nuclei, and consists of interpreting such signals in terms of self-conjugate (particle $=$ antiparticle) dark matter to see if such interpretation is consistent.
• If it is not, the dark matter must be different from its antiparticle.
• We illustrate this procedure for two sets of target nuclei, $\mathrm{\{Xe, Ar, Si\}}$ and $\mathrm{\{Xe, Ar, Ge\}}$, identifying the regions of the parameter space where it is particularly feasible.