Statistical Tests of Noise and Harmony in Dark Matter Modulation Signals
arXiv:1111.4222 · doi:10.1103/PhysRevD.85.063505
Abstract
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.
16 pages, 14 figures; minor correction to Fig. 11, conclusions unchanged; journal version
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Cited by in corpus (18)
- CoGeNT: A Search for Low-Mass Dark Matter using p-type Point Contact Germanium Detectors
- Annual Modulation of Dark Matter: A Review
- Modulation Effects in Dark Matter-Electron Scattering Experiments
- Dark Matter investigation by DAMA at Gran Sasso
- Effect of Gravitational Focusing on Annual Modulation in Dark-Matter Direct-Detection Experiments
- Dark Matter implications of DAMA/LIBRA-phase2 results
- Dark-Matter Harmonics Beyond Annual Modulation
- Fitting the annual modulation in DAMA with neutrons from muons and neutrinos
- Elastic scattering signals of solar neutrinos with enhanced baryonic currents
- Dark matter detection in two easy steps
- Muon-induced neutrons do not explain the DAMA data
- The Gran Sasso muon puzzle
- Time-dependent rate of multicomponent dark matter: Reproducing the DAMA/LIBRA phase-2 results
- Is the effect of the Sun's gravitational potential on dark matter particles observable?
- Harmonics in the Dark-Matter Sky: Directional Detection in the Fourier-Bessel Basis
- Comparisons of annual modulations in MINOS with the event rate modulation in CoGeNT
- Contamination of Dark Matter Experiments from Atmospheric Magnetic Dipoles
- On the Cosmic Ray Muon Hypothesis for DAMA