Λ0 Polarization in exclusive and inclusive p-Nucleus reactions

Among all properties of baryons, the polarization they acquire when created from unpolarized p-Nucleus collisions is the most recent discovered one; so far, the origin of baryon polarization remains unexplained in spite of the experimental evidences accumulated in the past thirty years. Up to these days, Λ0 is the most studied baryon for polarization, because it is very easy to produce at the energies of the principal high energy physics accelerators of the world. This paper is a review of the experimental information accumulated on the polarization of Λ0 in unpolarized exclusive and inclusive p-Nucleus collisions as function of xF, PT, and diffractive mass of the Λ0K+ system in the past thirty years.