Multiplicity, Transverse Momentum, Forward-Backward Long Range   Correlations and Percolation of strings
  The fluctuations due to the clustering of color sources can explain the behaviour of the scaled multiplicity variance and transverse momentum fluctuations with centrality. They also predict a nonmonotonic behaviour with centrality for the multiplictiy associated to high pT events. The clustering of color sources gives rise to an increase in the long-range correaltions with centrality as well as to a supression at high centrality with respect to superposition model predictions. 
L.Cunqueiro, E.G.Ferreiro and C.Pajares