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

Publication ,  Journal Article
Aalseth, CE; Barbeau, PS; Colaresi, J; Collar, JI; Leon, JD; Fast, JE; Fields, NE; Hossbach, TW; Knecht, A; Kos, MS; Marino, MG; Miley, HS ...
January 14, 2014

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.

Duke Scholars

Publication Date

January 14, 2014
 

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Aalseth, C. E., Barbeau, P. S., Colaresi, J., Collar, J. I., Leon, J. D., Fast, J. E., … Yocum, K. M. (2014). Search for An Annual Modulation in Three Years of CoGeNT Dark Matter Detector Data.
Aalseth, C. E., P. S. Barbeau, J. Colaresi, J. I. Collar, J Diaz Leon, J. E. Fast, N. E. Fields, et al. “Search for An Annual Modulation in Three Years of CoGeNT Dark Matter Detector Data,” January 14, 2014.
Aalseth CE, Barbeau PS, Colaresi J, Collar JI, Leon JD, Fast JE, et al. Search for An Annual Modulation in Three Years of CoGeNT Dark Matter Detector Data. 2014 Jan 14;
Aalseth CE, Barbeau PS, Colaresi J, Collar JI, Leon JD, Fast JE, Fields NE, Hossbach TW, Knecht A, Kos MS, Marino MG, Miley HS, Miller ML, Orrell JL, Yocum KM. Search for An Annual Modulation in Three Years of CoGeNT Dark Matter Detector Data. 2014 Jan 14;

Publication Date

January 14, 2014