Rapidity and energy dependence of average transverse momentum and particle density in saturation models

Abstract

Saturation models — colour glass condensate and string percolation — impose a strict relation between the average transverse momentum, 〈 P T 〉 , and the rapidity particle densities, d n / d y . By combining this relation with an appropriate evolution equation for d n / d y , and imposing energy–momentum conservation, we obtain a fair description of data, for generic AB collisions (hadron–hadron, hadron–nucleus and nucleus–nucleus) at all rapidities and (high) energies. Predictions are given for the LHC.