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Title: 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 found no candidates, thereby excluding new parameter space for particles with electric charges between e/6 and e/200.
Authors:
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Publication Date:
OSTI Identifier:
1253345
DOE Contract Number:
AC02-07CH11359; AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 114; Journal Issue: 11
Publisher:
American Physical Society (APS)
Research Org:
Univ. of California, Santa Barbara, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
CDMS Collaboration
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS