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

R. Agnese et al. (CDMS Collaboration)
Phys. Rev. Lett. 114, 111302 – Published 18 March 2015

Abstract

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.

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  • Received 22 September 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.111302

© 2015 American Physical Society

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Vol. 114, Iss. 11 — 20 March 2015

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