Low Q^2 Weak Mixing Angle Measurements and Rare Higgs Decays

Abstract

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 the rare Higgs decays H -> Z Z_d -> 4 charged leptons at the LHC. The sensitivity of future anticipated low Q^2 measurements of sin^2 theta_W(Q^2) to intermediate mass Z_d is also illustrated. This dark Z scenario can provide interesting concomitant signals in low energy parity violating measurements and rare Higgs decays at the LHC, over the next few years.

Version to appear in PRD

References in corpus (10)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Illuminating Dark Photons with High-Energy Colliders
• Exotic Decays of the 125 GeV Higgs Boson
• Probing a Secluded U(1) at B-factories
• Muon g-2, Rare Kaon Decays, and Parity Violation from Dark Bosons
• Higgs boson decays to four fermions through an abelian hidden sector
• Search for a light pseudoscalar Higgs boson in the dimuon decay channel in pp collisions at sqrt(s) = 7 TeV
• Searching for dilepton resonances below the Z mass at the LHC
• Global analysis of parity-violating asymmetry data for elastic electron scattering

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