1212.3102 (C. Andrés et al.)

Universal geometrical scaling for hadronic interactions    [PDF]

C. Andrés, A. Moscoso, C. Pajares

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 $\tau=p^2_T/Q_s^2$ for $p_T1$, 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.

View original: http://arxiv.org/abs/1212.3102