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First direct limits on lightly ionizing particles with electric charge less than e/6.

R Agnese1, A J Anderson2, D Balakishiyeva1

  • 1Department of Physics, University of Florida, Gainesville, Florida 32611, USA.

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|April 4, 2015
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Summary
This summary is machine-generated.

The Cryogenic Dark Matter Search experiment found no evidence for new particles with fractional electric charge. This search excludes new parameter space for hypothetical particles with charges below e/6.

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Area of Science:

  • Particle Physics
  • Cosmology
  • Experimental Physics

Background:

  • The standard model of particle physics does not predict free particles with fractional electric charge.
  • Despite theoretical exclusion, experimental searches for such particles remain crucial.

Purpose of the Study:

  • To set direct-detection limits for cosmogenically produced relativistic particles with electric charge lower than e/6.
  • To explore new parameter space for hypothetical fractionally charged particles.

Main Methods:

  • Utilized data from the Cryogenic Dark Matter Search (CDMS II) experiment.
  • Analyzed tracks in six stacked detectors across two CDMS II towers.
  • Searched for signatures of relativistic particles with sub-elementary electric charges.

Main Results:

  • No candidate events were detected in the analyzed CDMS II data.
  • Established the first direct-detection limits for particles with electric charges less than e/6.
  • Excluded new parameter space for particles with electric charges ranging from e/6 down to e/200.

Conclusions:

  • The absence of detected signals places constraints on the existence of certain fractionally charged particles.
  • This study demonstrates the capability of direct-detection experiments to probe for novel particle physics beyond the standard model.