Muon g−2 and searches for a new leptophobic sub-GeV dark boson in a missing-energy experiment at CERN

@article{Gninenko2014MuonGA,
  title={Muon g−2 and searches for a new leptophobic sub-GeV dark boson in a missing-energy experiment at CERN},
  author={Sergei Gninenko and N. V. Krasnikov and Viktor A. Matveev},
  journal={Physical Review D},
  year={2014},
  volume={91},
  pages={095015}
}
The 3.6 \sigma discrepancy between the predicted and measured values of the anomalous magnetic moment of positive muons can be explained by the existence of a new dark boson Z_\mu with a mass in the sub-GeV range, which is coupled predominantly to the second and third lepton generations through the L_\mu - L_\tau current . After a discussion of the present phenomenological bounds on the Z_\mu coupling, we show that if the Z_\mu exists, it could be observed in the reaction \mu+Z \to \mu+Z+Z_\mu… 

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