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The article is devoted to double J/psi-meson production at LHC. Theoreticalpredictions for pp -> 2J/psi+X cross section at sqrt{s}=7 TeV for differentkinematical restrictions are presented. Special attention is payed to possiblecontribution of novel particles -- tetraquarks build from four c-quarks.According to presented in our article estimates, it is quietly possible toobserve at least one of these state (tensor meson) experimentally.

Double J/psi-meson Production at LHC and 4c-tetraquark state