Dark matter and a new gauge boson through kinetic mixing

Abstract

We consider a hidden sector model of dark matter which is charged under a hidden U(1)_X gauge symmetry. Kinetic mixing of U(1)_X with the Standard Model hypercharge U(1)_Y is allowed to provide communication between the hidden sector and the Standard Model sector. We present various limits on the kinetic mixing parameter and the hidden gauge coupling constant coming from various low energy observables, electroweak precision tests, and the right thermal relic density of the dark matter. Saturating these constraints, we show that the spin-independent elastic cross section of the dark matter off nucleons is mostly below the current experimental limits, but within the future sensitivity. Finally, we analyze the prospect of observing the hidden gauge boson through its dimuon decay channel at hadron colliders.

21 pages, 9 figures, references added

References in corpus (8)

• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
• First Dark Matter Results from the XENON100 Experiment
• U-boson production in e+e- annihilations, psi and Upsilon decays, and Light Dark Matter
• Light Dark Matter from the U(1)_X Sector in the NMSSM with Gauge Mediation
• Dark matter and sub-GeV hidden U(1) in GMSB models
• LHC and ILC probes of hidden-sector gauge bosons
• Galactic 511 keV line from MeV millicharged dark matter
• Search for TeV-scale bosons in the dimuon channel at the LHC

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