Search for an Annual Modulation in a P-type Point Contact Germanium Dark Matter Detector

Authors:
  • JLJ. Diaz Leon
    J. Diaz Leon
  • JFJ. E. Fast
    J. E. Fast
  • MMM. G. Marino
    M. G. Marino
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Abstract
Fifteen months of cumulative CoGeNT data are examined for indications of an annual modulation, a predicted signature of Weakly Interacting Massive Particle (WIMP) interactions. Presently available data support the presence of a modulated component of unknown origin, with parameters prima facie compatible with a galactic halo composed of light-mass WIMPs. Unoptimized estimators yield a statistical significance for a modulation of ~2.8 sigma, limited by the short exposure.