Abstract
The knowledge of two-photon processes increased during the last years thanks to the large sample of $\mbox{e}^+\mbox{e}^{-} \rightarrow \mbox{e}^+\mbox{e}^{-} \; hadrons$ events collected at LEP. Non perturbative QCD phenomena are investigated through the study of exclusive meson and baryon pair production. The cross sections are measured as a function of the γ γ center-of-mass energy, W γ γ , and the center-of-mass production angle of the hadron, θ*. Exclusive ρ0 ρ0 and ρ+ ρ– production for quasi-real photons are investigated through a spin-parity-helicity analysis. Exclusive ρ0 ρ0 production is also studied as a function of the photon virtuality Q2 and compared to recent QCD predictions. PACS: 13.66Bc Hadron production in $\mbox{e}^+\mbox{e}^-$ interactions
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