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Evidence for a never-before-seen particle containing four types of quark has shown up in data from the Tevatron collider at the Fermi National Accelerator Laboratory Fermilab in Illinois. The discovery could help elucidate the complex rules that govern quarks—the tiny fundamental particles that make up the protons and neutrons inside all the atoms in the universe.

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Protons and neutrons each contain three quarks, which is by far the most stable grouping. Pairs of quarks, called mesons, also commonly appear, but larger conglomerations of quarks are extremely rare.

Scientists at the Large Hadron Collider LHC in Switzerland last year saw the first signs of a pentaquark —a grouping of five quarks—which had long been predicted but never seen. The first tetraquark was found in at the Belle experiment in Japan, and since then physicists have encountered a half dozen different arrangements.

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But the new one, if confirmed, would be special. Is this telling us something?

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I hope yes. Physicists have a theory—called quantum chromodynamics—that describes how the strong force works, but it is incredibly unwieldy and difficult to make predictions with. One open question is: How many quarks can stick together to form a particle?

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So far scientists have not seen groupings of more than five, but theoretically there is no limit. Physicists would also like to discover different configurations of four and five quarks than the handful that have been seen.

The Tevatron collider shut down in , but the DZero team found signs of the new tetraquark in the archive of data from the tens of billions of particle collisions it achieved during its 28 years of operation. Until the check is done and the DZero result is confirmed, we are not sure exactly what they are seeing.

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Either way, scientists expect current particle accelerators—especially the LHC, which restarted last year at higher energy levels than ever before—to discover more new particle configurations in the coming years, making it an exciting time for quark physics and for clearing up the intricate mechanics of the strong force.

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