paper

Discriminating WIMP-nucleus response functions in present and future XENON-like direct detection experiments

arXiv:1802.04294 · doi:10.1103/PhysRevD.97.103532

Abstract

The standard interpretation of direct-detection limits on dark matter involves particular assumptions of the underlying WIMP-nucleus interaction, such as, in the simplest case, the choice of a Helm form factor that phenomenologically describes an isoscalar spin-independent interaction. In general, the interaction of dark matter with the target nuclei may well proceed via different mechanisms, which would lead to a different shape of the corresponding nuclear structure factors as a function of the momentum transfer . We study to what extent different WIMP-nucleus responses can be differentiated based on the -dependence of their structure factors (or "form factors"). We assume an overall strength of the interaction consistent with present spin-independent limits and consider an exposure corresponding to XENON1T-like, XENONnT-like, and DARWIN-like direct detection experiments. We find that, as long as the interaction strength does not lie too much below current limits, the DARWIN settings allow a conclusive discrimination of many different response functions based on their -dependence, with immediate consequences for elucidating the nature of dark matter.

arXiv comment10 pages, 7 figures

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