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Phys. Rev. D 66, 012002 (2002) [10 pages]

Large bulk matter search for fractional charge particles

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Irwin T. Lee, Sewan Fan, Valerie Halyo, Eric R. Lee, Peter C. Kim, Martin L. Perl, and Howard Rogers
Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309

Dinesh Loomba
Department of Physics, University of New Mexico, Albuquerque, New Mexico 87131

Klaus S. Lackner
Department of Earth and Environmental Engineering, Columbia University, New York, New York 10027

Gordon Shaw
Department of Physics, University of California–Irvine, Irvine, California 92717

Received 3 April 2002; published 9 July 2002

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.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.66.012002
DOI:
10.1103/PhysRevD.66.012002
PACS:
14.80.-j, 13.40.Em, 14.65.-q, 47.60.+i
 
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