There is convincing evidence that a significant fraction of the mass in our Universe consists of non-baryonic and non-luminous dark matter. The particles forming this cosmological component have so far escaped
detection, but are currently searched for at direct detection experiments. These search for non-relativistic dark matter-nucleus scattering events in low-background, deep underground detectors. In this thesis, I study the properties of spin-0 dark matter-nucleus interactions under P and CP-transformations, assuming that a dark matter signal has been observed at direct detection experiments. Using an eective theory to describe
these interactions, the scattering events can be restricted to three cases: Conserving CP and P; Conserving CP, but violating P; and violating both CP and P. By performing a likelihood ratio test with simulated data, this
thesis aims to determine how many observed scattering events are required in order to discriminate one case from the other in the next generation of direct detection experiments.
Keywords: High Energy Physics, Dark Matter, Eective Theory, Direct De-tection, P and CP-transformations
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