Two-Photon Production of Four-Quark States Up to the $J/ψ$ Energy
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Evidence for an explicitly exotic state with isospin 2 and spin-parity 2^+ near the $ρρ$ threshold and nontrivial complementary indications of the unusual quark composition of the $f_0(980)$ and $a_0(980)$ states obtained from the reactions of two-photon formation of neutral meson resonances are discussed, together with puzzling phenomena in the channels $γγ\toρ^0ϕ$ and $γγ\toρ^0ρ^0$ at high energies.
RevTex, 5 pages and one PS figure. Talk presented by G.N. Shestakov at the International Workshop on e^+e^- Collisions from $ϕ$ to $J/ψ$, Budker Institute of Nuclear Physics, Novosibiksk, Russia, March 1-5, 1999
RevTex, 5 pages and one PS figure. Talk presented by G.N. Shestakov at the International Workshop on e^+e^- Collisions from $ϕ$ to $J/ψ$, Budker Institute of Nuclear Physics, Novosibiksk, Russia, March 1-5, 1999