A preliminary analysis of data taken by the LHCb collaboration at the CERN particle-physics lab near Geneva casts doubt on the recent claim by physicists on the D0 experiment at Fermilab in the US that they have discovered an exotic particle containing four quarks. Dubbed X(5568), the tetraquark was believed to contain "up" and "bottom" quarks as well as "down" and "strange" antiquarks. Quarks normally group together in pairs to form mesons or threes to make baryons.
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