Abstract :
[en] The possible production of
multiquark systems is very important for our understanding of hadrons.
A considerable interest in such states started with Jaffe's work in 1977,
demonstrating the role of the chromomagnetic interaction in the stability of
light multiquarks. Since then, heavy quarks have also been included. A brief
survey is presented regarding the evolution of the problem.
Some of the recently observed resonances, named X,Y or Z, are
discussed as possible candidates for tetraquarks.
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