Evolution of particle density in high-energy pp collisions
  We study the evolution of the particle density, dn/d\eta at fixed \eta with the beam rapidity Y in the framework of string percolation model. Our main results are: (i) The width of the "plateau" increases proportionally to Y, (ii) limiting fragmentation is violated, and (iii) the particle density, reduces to a step function. 
I. Bautista, C. Pajares, J. Dias de Deus
nucl-th