Universal geometrical scaling for hadronic interactions

Abstract

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 $\tau =p_T^2/Q_s^2$ for $p_T<Q_s$. For different projectiles, targets and centralities, the corresponding $\tau$-lines present small differences for $\tau <1$. For $\tau >1$, 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.

Comments: 7 pages, 5 figures, 1 table