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Hidden Fermion in Stueckelberg Z' Models as Milli-charged Dark Matter · Around

2007

Hidden Fermion in Stueckelberg Z' Models as Milli-charged Dark Matter

Cheung, Kingman, Yuan, Tzu-Chiang

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The hidden Stueckelberg Z' model is augmented by a pair of Dirac fermions.

If the Z' has a coupling strength comparable to weak scale coupling, one can show that this hidden fermion-antifermion pair could be a milli-charged dark matter candidate with a viable relic density.
Monochromatic photon flux coming from the Galactic center due to pair annihilation of these milli-charged particles is calculated and is shown to be within reach of the next generation gamma-ray experiments.
Characteristic collider signature of this theoretical endeavor is that the Stueckelberg Z' boson has a large invisible width decaying into the hidden fermion-antifermion pair if kinematically allowed.

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