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What year did Fritz Zwicky discover dark matter? 

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This modifies the dark matter phenomenology at a quantitative level.
This Z′ may also set the dark matter observables and give rise to the LHC dilepton and dijet signals.
Therefore, collider search of the mediator can provide a more comprehensive probe of the dark matter and its interactions.
This suppresses the rate at direct detection searches and thus alleviates the constraints on Z′-mediated dark matter relic abundance.

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