Abstract : The nuclear physic project GRAAL located at the European Synchrotron Radiation Facility (ESRF) produces a linearly or circularly polarized gamma-ray from backward Compton scattering.
The characteristics of this beam allow to study the photoproduction reactions of pseudo-scalar mesons (pion, eta, kaon) photoproduction. Some related theoretical aspects are presented in this work.
A detailed description of the analysis procedure enables to understand the complete treatment of data from the experiment to presentation of the preliminary results of the Sigma asymmetry of the reaction gamma + p -> p + X (X=pi0, eta) at the energy range 700 -1100 MeV.
The way to extract the polarization observables of the reaction gamma + p -> K+ + lambda has been developed using Monte-Carlo simulation. The reproduction of the values of the three single polarization (P, Sigma, T) and the four double polarization beam-recoil (Ox,Oz, Cx, Cz) observables for a simulated data set of 100000 events gamma + p -> K+ + lambda with good precision, shows that these quantities can be measured in the GRAAL experiment.