Search for An Annual Modulation in Three Years of CoGeNT Dark Matter Detector Data

Weakly Interacting Massive Particles (WIMPs) are well-established dark matter candidates. WIMP interactions with sensitive detectors are expected to display a characteristic annual modulation in rate. We release a dataset spanning 3.4 years of operation from a low-background germanium detector, designed to search for this signature. A previously reported modulation persists, concentrated in a region of the energy spectrum populated by an exponential excess of unknown origin. Its phase and period agree with phenomenological expectations, but its amplitude is a factor

\sim

4-7 larger than predicted for a standard WIMP galactic halo. We consider the possibility of a non-Maxwellian local halo velocity distribution as a plausible explanation, able to help reconcile recently reported WIMP search anomalies.

Note:

Three datasets and note on usage included as ancillary files

85.30.-z
95.35.+d
WIMP: interaction
dark matter: detector
germanium: detector
dark matter: galaxy: halo
flux: time dependence
modulation
energy spectrum
dark matter: scattering

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