Polarized light propagating in a magnetic field as a probe for millicharged fermions.

@article{Gies2006PolarizedLP,
  title={Polarized light propagating in a magnetic field as a probe for millicharged fermions.},
  author={H. Gies and J. Jaeckel and A. Ringwald},
  journal={Physical review letters},
  year={2006},
  volume={97 14},
  pages={
          140402
        }
}
Possible extensions of the standard model of particle physics suggest the existence of particles with small, unquantized electric charge. Photon-initiated pair production of millicharged fermions in a magnetic field would manifest itself as a vacuum magnetic (VM) dichroism. We show that laser polarization experiments searching for this effect yield, in the mass range below 0.1 eV, much stronger constraints on millicharged fermions than previous laboratory searches. VM birefringence due to… Expand
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