ASK any particle physicist to bet on which new particle will be discovered next and the most popular answer, at least until recently, would have been the Higgs boson. A less well known particle - the leptoquark - would have been well down most people's list. However, dramatic new results from HERA, the high-energy collider at the DESY Laboratory in Hamburg, could be the first evidence for these unusual new particles. Alternativelyjfe the data might indicate that quarks, previously thought to be elementary particles, have substructure.
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