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摘要
<正>In a research article appeared in this journal[1], the LHCb Collaboration has presented an extraordinary result on the mass spectrum of J/ψ-pairs produced in proton-proton high energy collisions. The spectrum shows: a narrow structure around 6:9 GeV matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass. In the same region, more resonances may be present, not clearly distinguished within present statistics(see Fig. 1). A new spectroscopy is waiting for us, that of fully charm tetraquarks, which parallels the spectroscopy of charmonia revealed by the J/ψ discovery of 1974.
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