First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e/1000 with the Majorana Demonstrator
Name
PhysRevLett.120.211804.pdf
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1.07 MB
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Author(s)
Alvis, S. I.
Arnquist, I. J.
Avignone, F. T.
Barabash, A. S.
Barton, C. J.
Bertrand, F. E.
Brudanin, V.
Busch, M.
Buuck, M.
Caldwell, T. S.
Date Issued
May 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Alvis, S. I., et al. “First Limit on the Direct Detection of Lightly Ionizing Particles for Electric Charge as Low as e / 1000 with the Majorana Demonstrator.” Physical Review Letters, vol. 120, no. 21, May 2018. © 2018 American Physical Society
Version
Final published version
Abstract
The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in [superscript 76]Ge. The heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility in Lead, South Dakota, also allows searches for new exotic physics. Free, relativistic, lightly ionizing particles with an electrical charge less than e are forbidden by the standard model but predicted by some of its extensions. If such particles exist, they might be detected in the Majorana Demonstrator by searching for multiple-detector events with individual-detector energy depositions down to 1 keV. This search is background-free, and no candidate events have been found in 285 days of data taking. New direct-detection limits are set for the flux of lightly ionizing particles for charges as low as e/1000.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.120.211804
