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={Holger Gies and Joerg Jaeckel and Andreas 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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Preface Acknowledgments 1: The Energy-Loss Argument 2: Anomalous Stellar Energy Losses Bounded by Observations 3: Particles Interacting with Electrons and Baryons 4: Processes in a Nuclear Medium 5:Expand