Muon anomaly and dark parity violation.

@article{Davoudiasl2012MuonAA,
  title={Muon anomaly and dark parity violation.},
  author={Hooman Davoudiasl and Hye-Sung Lee and William J. Marciano},
  journal={Physical review letters},
  year={2012},
  volume={109 3},
  pages={
          031802
        }
}
The muon anomalous magnetic moment exhibits a 3.6σ discrepancy between experiment and theory. One explanation requires the existence of a light vector boson, Z(d) (the dark Z), with mass 10-500 MeV that couples weakly to the electromagnetic current through kinetic mixing. Support for such a solution also comes from astrophysics conjectures regarding the utility of a U(1)(d) gauge symmetry in the dark matter sector. In that scenario, we show that mass mixing between the Z(d) and ordinary Z boson… 

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