[EN] We have studied the gammap--> pi+ pi- p reaction using a model which includes N, DELTA(1232), N*(1440) and N*(1520) intermediate baryonic states and the rho-meson as intermediate 2pi-resonance. The model reproduces ...
[EN] We have studied the gamma d --> Delta(++)Delta(-) reaction which requires the collaboration of the two nucleons in deuteron. By means of a model previously developed for the gamma p --> p pi(+) pi(-) reaction, the ...
[EN] The inclusive A(¿,¿+¿¿)X reaction is studied theoretically. A sizable enhancement of the cross section is found, in comparison with the scaling of the deuteron cross section (). This enhancement is due to the modifications ...