Large bulk matter search for fractional charge particles

Irwin T. Lee, Sewan Fan, Valerie Halyo, Eric R. Lee, Peter C. Kim, Martin L. Perl, Howard Rogers, Dinesh Loomba, Klaus S. Lackner, Gordon Shaw

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We have carried out the largest search for stable particles with fractional electric charge, based on an oil drop method that incorporates a horizontal electric field and upward air flow. No evidence for such particles was found, giving a 95% confidence level upper limit of 1.17 × 10-22 particles per nucleon on the abundance of fractional charge particles in silicone oil for 0.18e≤Qresidual≤0.82e. Since this is the first use of this new method we describe the advantages and limitations of the method.

Original languageEnglish (US)
Article number012002
Pages (from-to)120021-1200210
Number of pages1080190
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number1 II
StatePublished - Jul 1 2002
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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