Search for an annual modulation in a p-type Point Contact germanium dark matter detector

Area of Science:

• Particle Physics
• Astrophysics
• Cosmology

Background:

• The search for dark matter is a major focus in modern physics.
• Weakly Interacting Massive Particles (WIMPs) are leading candidates for dark matter.
• Annual modulation in direct detection experiments is a predicted signature of WIMP interactions with Earth.

Purpose of the Study:

• To analyze 15 months of CoGeNT data for evidence of annual modulation.
• To investigate if the observed modulation is consistent with a galactic halo of light-mass WIMPs.

Main Methods:

• Analysis of cumulative CoGeNT (Coherent Germanium Neutrino Telescope) data.
• Application of unoptimized estimators to assess statistical significance.

Main Results:

• A modulated component of unknown origin is supported by the data.
• The parameters of the modulation are prima facie compatible with light-mass WIMPs.
• A statistical significance of approximately 2.8σ for modulation was found, limited by exposure.

Conclusions:

• The CoGeNT data provide preliminary evidence for annual modulation.
• This modulation is potentially indicative of a dark matter signal from light-mass WIMPs.
• Increased data exposure is crucial for confirming these findings.