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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 γγ collisions during the last decade is presented. The resonance phenomena in the reactions γγ→ρ0ρ0, γγ→ρ+ρ−, γγ→ωρ0, γγ→K∗ˉK∗, γγ→ωω, γγ→φV, γγ→π0η and γγ→ππ are discussed in detail. In particular, it is shown that presently there are telling arguments for observation of a tensor exotic q2ˉq2, resonance with isospin I=2 near the ρρ threshold in γγ→ρ0ρ0 and γγ→ρ+ρ−. A set of new experiments for the elucidation of the physical nature of the considered phenomena is also suggested.
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