Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-11-17
Phys. Rev. D 85, 063505 (2012)
Physics
High Energy Physics
High Energy Physics - Phenomenology
16 pages, 14 figures; minor correction to Fig. 11, conclusions unchanged; journal version
Scientific paper
10.1103/PhysRevD.85.063505
The aim of the current work is a detailed time-series analysis of the data from Dark Matter direct detection experiments as well as related datasets. We examine recent claims that the cosmic ray muon flux can be responsible for generating the modulation signals seen by DAMA and, more recently, by the CoGeNT collaboration. We find no evidence for such a strong correlation and show that the two phenomena differ in their power spectrum, phase, and possibly in amplitude. In addition, we investigate in more detail, the time dependence of Dark Matter scattering. Since the signal is periodic with period of a year (due to the Earth's motion around the Sun), the presence of higher harmonics can be expected. We show that the higher harmonics generically have similar phase to the annual modulation and the biannual mode in particular could provide another handle in searching for Dark Matter in the laboratory.
Chang Spencer
Pradler Josef
Yavin Itay
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