G. N. Shestakov

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It is shown that the list of unusual mesons planned for a careful study with the photon facility at JLAB can be extended by the exotic states X(1600) with I(J) = 2(2) which should be looked for in the ρρ decay channels in the reactions γN → ρρN and γN → ρρ∆. The full classification of the ρρ states by their quantum numbers is presented. A simple model for(More)
The K+ and K0 meson mass difference induces the mixing of the a(0)(0)(980) and f(0)(980) resonances, the amplitude of which, between the K+K- and K0(-)K(0) thresholds, is large in magnitude, of the order of m(K)m(2)(K0)sqrt[-m(2)(K+)] approximately sqrt[alpha] m(2)(K), and possesses the phase sharply varying by about 90 degrees. We suggest performing the(More)
One of the most striking effects found in two-photon reactions is the large cross section for the reaction γγ → ρρ near its threshold and at the same time the much lower cross section for the reaction γγ → ρρ that rules out an ordinary qq̄ resonance interpretation (for reviews see e.g. [1-3]). Another important fact is the smallness of the two-photon widths(More)
The light scalar mesons, discovered forty years ago, became a challenge for the naive quarkantiquark model from the outset. At present the nontrivial nature of these states is no longer denied practically anybody. We review a substantial contribution of the two-photon physics to understanding the nature of the light scalar mesons and new results for their(More)
The main dynamical mechanisms of the reaction πp → a0(980)n → πηn at high energies, currently investigated at Serpukhov and Brookhaven, are considered in detail. It is shown that the observed forward peak in its differential cross section can be explained within the framework of the Regge pole model only by the conspiring ρ2 Regge pole exchange. The(More)
We consider the lightest scalar meson in the frame of the SU(L)2 x SU(R)2 linear sigma model, keeping in mind that this model could be the low energy realization of two-flavor QCD. We show that the sigma field is described by its four-quark component at least in the sigma resonance energy (virtuality) region and the sigma-->gammagamma decay is the(More)
It is shown that the list of unusual mesons planned for a careful study in photoproduction can be extended by the exotic states X(1600) with I(J) = 2(2) which should be looked for in the ρρ decay channels in the reactions γN → ρρN and γN → ρρ∆. The full classification of the ρρ states by their quantum numbers is presented. A simple model for the spin(More)
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