Low $Q^2$ weak mixing angle measurements and rare Higgs decays

@article{Davoudiasl2015LowW,
  title={Low \$Q^2\$ weak mixing angle measurements and rare Higgs decays},
  author={Hooman Davoudiasl and Hye-Sung Lee and William J. Marciano},
  journal={Physical Review D},
  year={2015},
  volume={92},
  pages={055005}
}
A weighted average weak mixing angle theta_W derived from relatively low Q^2 experiments is compared with the Standard Model prediction obtained from precision measurements. The approximate 1.8 sigma discrepancy is fit with an intermediate mass (~ 10-35 GeV) "dark" Z boson Z_d, corresponding to a U(1)_d gauge symmetry of hidden dark matter, which couples to our world via kinetic and Z-Z_d mass mixing. Constraints on such a scenario are obtained from precision electroweak bounds and searches for… 

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