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We consider a modification of electrodynamics in which right- andleft-circularly polarized photons are coupled to charged sources differently.Even though photon helicity is a Lorentz invariant quantity, such amodification breaks Lorentz symmetry, as well as locality. The modified theoryincludes novel magnetic forces between perpendicular currents. Existing datacan be used to constrain the modification at approximately a 2 x 10^(-3) level.

Coupling Right- and Left-Handed Photons Differently to Charged Matter