2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/179072It is shown that the critical threshold for percolation of the overlapping strings exchanged in heavy ion collisions can naturally explain the sharp strong suppresion of $J/ψ$ shown by the experimental data on central Pb--Pb collisions, which does not occur in central O--U and S--U collisions.11 pages in LaTeX plus 1 postscript figureHigh Energy Physics - Phenomenologytext