13 Δφ$^{>}$ Ridge Particles are inside the 2 Boxes  = 0.7  = 40 0 trigger particle FIG. 9: In this figure we display the φ and η ranges considered for producing ridge particles in the Au Au central collisions. A typical trigger particle ( p t between 3.0 to 4.0 GeV/c) implies two associated regions in the considered φ and η ranges where the ridge particles lie. The ridge particles we consider are separated by 0.7 in η (Δ η ) so that one eliminates particles coming from jet production. The bulk of the ridge particles lie within 20 ◦ of the φ of the trigger particle. The width of the φ spread is Δ φ = 40 ◦ .