First direct limits on Lightly Ionizing Particles with electric charge less than $e/6$
R. Agnese, A.J. Anderson, D. Balakishiyeva, R. Basu Thakur, D.A., Bauer, J. Billard, A. Borgland, M.A. Bowles, D. Brandt, P.L. Brink, R., Bunker, B. Cabrera, D.O. Caldwell, D.G. Cerdeno, H. Chagani, Y. Chen, J., Cooley, B. Cornell, C.H. Crewdson, P. Cushman, M. Daal
TL;DR
This paper reports the first direct detection limits on lightly ionizing particles with charges less than one-sixth of the electron charge, using the CDMS II experiment to exclude new parameter space.
Contribution
It provides the first direct-detection limits for relativistic particles with fractional electric charges below e/6, expanding the search for such particles.
Findings
No candidate particles were detected in the search.
New exclusion limits established for particles with charges between e/6 and e/200.
Results constrain the existence of lightly ionizing particles in the specified charge range.
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 /6. A search for tracks in the six stacked detectors of each of two of the CDMS II towers found no candidates, thereby excluding new parameter space for particles with electric charges between /6 and /200.
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