WIMP Dark Matter Modulation Analysis on Data from Low Threshold Germanium Detectors

Hau-Bin Li^1*

¹Institute of Physics, Academia Sinica, Taipei, Taiwan

* Presenter:Hau-Bin Li, email:lihb@gate.sinica.edu.tw

We present results on light weakly interacting massive particles (WIMPs) searches with annual modulation (AM) analysis on data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at the China Jinping Underground Laboratory. Data set with a total live-time of 3.2 years within a 4.2-year span are analyzed with physics threshold of 250 eVee. Annual modulation limits on WIMP-nucleus elastic scatterings cross-section through spin-independent interactions, as well as limits on Migdal effects will be explained. Diurnal modulation limits on WIMP-nucleus and annual modulation limits on WIMP-electrons will also be reported. In these analyses, we adopted a binned chi-squared approach, that allowed us to avoid background interpretation. Unknown background contributions, as well as those from time static dark matter contributions, are treated as free parameters to be fitted.

Ref: arXiv:1904.12889

Keywords: Annual modulation, WIMPs searches, Germanium detector