Universal geometrical scaling for hadronic interactions

It is shown that defining a suitable saturation momentum $Q_s$, the $p_T$ distributions of pp and AA collisions for any centrality and energy depend only on $τ=p^2_T/Q_s^2$ for $p_T<Q_s$. For different projectiles, targets and centralities, the corresponding $τ$-lines present small differences for $τ<1$. For $τ>1$, the higher the energy or the larger the size of the participant nuclei, the larger suppression present the respective spectra. The integrated spectrum gives a fraction of the hard multiplicity in the range from 9% for pp at 0.9 TeV to 2% for Pb-Pb central collisions at 2.76 TeV.

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