Minimal center-of-mass energy required for QGP formation in pp and AA collisions

We discuss the conditions for QGP formation under the Color String Percolation Model. Since the observables in the percolation theory are sensitive to the system size, we expect the finite size effects take a relevant contribution to the estimation of the color string observables, such as the transition temperature or the center of mass energy needed for the QGP formation. We observe that pp collisions (small systems) require around 20 times bigger center of mass energy than heavy ion collisions. Our results are consistent with the experiments claiming that the QGP has been observed.