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Summary of the search for four-quark states in γγ collisionsS.L. Sobolev Institute for Mathematics, Siberian Branch of the Russian Academy of Sciences, prosp. akad. Koptyuga 4, Novosibirsk, 630090, Russian Federation A review of the results of the search for four-quark states in collisions during the last decade is presented. The resonance phenomena in the reactions , , , , , , and are discussed in detail. In particular, it is shown that presently there are telling arguments for observation of a tensor exotic , resonance with isospin near the threshold in and . A set of new experiments for the elucidation of the physical nature of the considered phenomena is also suggested.
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