LHC Makes Clear Identification of a Weird Particle Made of Four Quarks
Since 2008, however, researchers at CERN in Europe and at Belle in Japan found hints of a four-quark particle. Those hints were confirmed today by physicists at the LHCb experiment at CERN. To discover and characterize the particle, researchers sifted through 25,000 decays of mesons resulting from more than 180 trillion collisions at the Large Hadron Collider. This object they studied, known affectionately as Z(4430)-, has provided the first unambiguous measurement of a four-quark particle; earlier experiments also provided hints about another candidate, the Zc(3900)+.
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