Particles with electric charge q≤10^-3e and masses in the range 1--100MeV/c² are not excluded by present experiments. An experiment uniquely suited to the production and detection of such ``millicharged'' particles has been carried out at SLAC. This experiment is sensitive to the infrequent excitation and ionization of matter expected from the passage of such a particle. Analysis of the data rules out a region of mass and charge, establishing, for example, a 95%-confidence upper limit on electric charge of 4.1×10^-5e for millicharged particles of mass 1MeV/c² and 5.8×10^-4e for mass 100MeV/c².
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Prinz et al. (1998) studied this question.
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