Physicists from CERN’s LHCb Collaboration have found a brand new tetraquark particle, named X(6900), composed of two attraction quarks and two attraction antiquarks. Quarks are point-like elementary particles that sometimes are available in packages of two (mesons) or three (baryons), probably the most acquainted of that are the proton and neutron — every is product of three quarks. […]

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