The United States at the LHC. US involvement in LHC research. The Standard Model and Beyond. Where did all the antimatter go? The Large Hadron Collider. Why do particles have mass? What is dark matter? Where did all the antimatter go? US particle physicists work with an international community of scientists to tackle these types of questions using the largest and most powerful machine on Earth the Large Hadron Collider located near Geneva, Switzerland.

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