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Chernyak","submitted_at":"2014-09-11T08:21:21Z","abstract_excerpt":"This is a short review of some hard two-photon processes: $\\\\ a) \\,\\,\\gamma\\gamma\\to {\\overline P}_1 P_2,\\,\\, {\\overline P}_1 P_2= \\{\\pi^+\\pi^-, K^+ K^-, K_S K_S, \\pi^o\\pi^o, \\pi^o\\eta\\}\\,, \\\\ b) \\,\\,\\gamma\\gamma\\to V_1 V_2,\\,\\, V_1 V_2=\\{\\rho^o\\rho^o, \\phi\\phi, \\omega\\phi, \\omega\\omega \\},\\\\ c) \\,\\,\\gamma\\gamma\\to {\\rm baryon-antibaryon},\\\\ d) \\,\\,\\gamma^*\\gamma\\to P^o,\\,\\, P^o=\\{\\pi^o, \\eta, \\eta^\\prime, \\eta_c\\}$.\n  The available experimental data are presented. 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