Sommaire:

Direct searches for Dark Matter (DM) aim at detecting the nuclear recoils arising from a scattering between DM particles and target nuclei in underground detectors. Since the physics that describes the collision between DM particles and target nuclei is deeply non-relativistic, in the first part of this seminar I’ll review a different and more general approach to study signal in direct DM searches based on the formalism of non-relativistic operators. Then I’ll present the main observables and the experimental landscape pointing out all the uncertainties that enter in this field. Finally, since the underlying relativistic theory that describes both the DM and standard model fields is unknown, in the last part of the seminar I’ll be focussed on the uncertainties coming from the nature of the interaction. On a more specific level, the last part will be divided in two: i) a model independent part, in which I’m going to present a new method and a self-contained set of numerical tools to the derive the bounds from some current direct detection experiments in a completely model independent way; ii) a model dependent part, in which I’ll show that a Dirac DM particle interacting with ordinary matter via the exchange of a light pseudo-scalar can accommodate the DAMA data while being compatible with all null direct DM searches and at the same time provide a DM explanation of the GC excess in γ-rays and achieve the correct relic density.

Il seminario è basto sui seguenti lavori:
arXiv: arXiv:1402.1507
arXiv: arXiv:1307.5955
arXiv: arXiv:1406.5542

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Pour plus d'informations, merci de contacter Frigerio M.