Search for an Annual Modulation in a P-type Point Contact Germanium Dark   Matter Detector
  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. 
C.E. Aalseth, P.S. Barbeau, J. Colaresi, J.I. Collar, J. Diaz Leon,   J.E. Fast, N. Fields, T.W. Hossbach, M.E. Keillor, J.D...
astro-ph.CO hep-ex