Comparisons of annual modulations in MINOS with the event rate modulation in CoGeNT
Abstract
The CoGeNT Collaboration has recently published results from a fifteen month data set which indicate an annual modulation in the event rate similar to what is expected from weakly interacting massive particle interactions. It has been suggested that the CoGeNT modulation may actually be caused by other annually modulating phenomena, specifically the flux of atmospheric muons underground or the radon level in the laboratory. We have compared the phase of the CoGeNT data modulation to that of the concurrent atmospheric muon and radon data collected by the MINOS experiment which occupies an adjacent experimental hall in the Soudan Underground Laboratory. The results presented are obtained by performing a shape-free χ^2 data-to-data comparison and from a simultaneous fit of the MINOS and CoGeNT data to phase-shifted sinusoidal functions. Both tests indicate that the phase of the CoGeNT modulation is inconsistent with the phases of the MINOS muon and radon modulations at the 3.0σ level.
Additional Information
© 2013 American Physical Society. Received 8 December 2012; published 13 February 2013. This work was supported by the U.S. DOE, the United Kingdom STFC, the U.S. NSF, the State and University of Minnesota, the University of Athens, Greece and Brazil's FAPESP and CNPq. We are grateful to the Minnesota Department of Natural Resources, the crew of Soudan Underground Laboratory, and the staff of Fermilab for their contributions to this effort. We also thank Juan Collar and the CoGeNT Collaboration for sharing their data thus facilitating this analysis.Attached Files
Published - Adamson_2013p032005.pdf
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Additional details
- Eprint ID
- 37593
- Resolver ID
- CaltechAUTHORS:20130321-142853599
- Department of Energy (DOE)
- Science and Technology Facilities Council (STFC)
- NSF
- State of Minnesota
- University of Minnesota
- University of Athens
- Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Created
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2013-03-25Created from EPrint's datestamp field
- Updated
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2021-11-09Created from EPrint's last_modified field