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Particle discovery fills a gap

Neutral xi-sub-b was predicted by theory

Scientists have found a previously unseen particle using the Tevatron, the most powerful particle accelerator in the United States.

Predicted by the standard model of particle physics, the new particle fills a blank space in the family tree of baryons, making it a distant cousin of the neutron and the proton. Baryons are made of three quarks, small, fundamental building blocks of matter that come in different flavors. The newly discovered xi-sub-b (Ξb0) contains a strange quark, an up quark and a bottom quark.

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