A variation of the charged particle spectrum shape as function of   rapidity in high energy pp collisions
  The shapes of invariant differential cross section for charged particle production as function of transverse momentum measured in pp collisions by the UA1 detector are analyzed. The spectra shape varies with the produced particle's pseudorapidity changing. To describe this and several other recently observed effects a simple qualitative model for hadroproduction mechanism was proposed. 
A. A. Bylinkin, A. A. Rostovtsev (Institute for Theoretical and   Experimental Physics, ITEP, Moscow, Russia)
hep-ph