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arxiv: hep-ex/9804008 · v1 · submitted 1998-04-17 · ✦ hep-ex

Search for Millicharged Particles at SLAC

classification ✦ hep-ex
keywords particleschargemassmillichargedelectricexperimentslacanalysis
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Particles with electric charge q < 10^(-3)e and masses in the range 1--100 MeV/c^2 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 4.1X10^(-5)e for millicharged particles of mass 1 MeV/c^2 and 5.8X10^(-4)e for mass 100 MeV/c^2.

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Cited by 2 Pith papers

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  1. The Black Hole Mass Gap as a New Probe of Millicharged Particles

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    Millicharged particles weaken pulsational pair-instability in massive stars, shifting the lower edge of the black hole mass gap upward and turning gravitational wave observations into a probe for particles with masses...

  2. Underground Production of Electromagnetic Dark States by MeV-scale Electron Beams and Detection with CCDs

    hep-ph 2025-11 unverdicted novelty 4.0

    Proposes underground MeV-scale electron-beam production of millicharged or dipole fermions followed by CCD detection to access unconstrained parameter space.