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Published March 20, 2015 | Published + Submitted
Journal Article Open

First Direct Limits on Lightly Ionizing Particles with Electric Charge Less than e=6


While the standard model of particle physics does not include free particles with fractional charge, experimental searches have not ruled out their existence. We report results from the Cryogenic Dark Matter Search (CDMS II) experiment that give the first direct-detection limits for cosmogenically produced relativistic particles with electric charge lower than e/6. A search for tracks in the six stacked detectors of each of two of the CDMS II towers finds no candidates, thereby excluding new parameter space for particles with electric charges between e/6 and e/200.

Additional Information

© 2015 American Physical Society. Received 22 September 2014; revised manuscript received 3 February 2015; published 18 March 2015. The CDMS Collaboration gratefully acknowledges the contributions of numerous engineers and technicians; we would like to especially thank Dennis Seitz, Jim Beaty, Bruce Hines, Larry Novak, Richard Schmitt, Astrid Tomada, and John Emes. In addition, we gratefully acknowledge assistance from the staff of the Soudan Underground Laboratory and the Minnesota Department of Natural Resources. This work is supported in part by the National Science Foundation, by the U.S. Department of Energy, by NSERC Canada, and by MultiDark (Spanish MINECO). Fermilab is operated by the Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359. SLAC is operated under Contract No. DE-AC02- 76SF00515 with the U.S. Department of Energy.

Attached Files

Submitted - 1409.3270v2.pdf

Published - PhysRevLett.114.111302.pdf


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August 20, 2023
August 20, 2023