Large bulk matter search for fractional charge particles

Abstract

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% C.L. upper limit of $1.15\times 10^{-22}$ particles per nucleon on the abundance of fractional charge particles in silicone oil for $0.18e\le |Q_{residual}|\le 0.82e$.

Poster presentation at the XXII Physics in Collisions Conference (PIC02), Stanford, Ca, USA, June 2002, 3 pages, LaTeX, 3 eps figures. PSN THAP08