Relevant polarization observables for the study of the Roper resonance with hadronic probes

The purpose of this contribution is to stress the great importance of polarization observables for the study of nucleon resonances, in particular in the case of deuteron and proton probes. Polarization observables play a unique role in signing the reaction mechanism and bring new information in the microscopic description of baryon resonances. We will calculate the relevant polarization observables, for $p+d$- and $p+\alpha$-collisions, in case of inclusive reactions and for some selected exclusive channels.