An analysis of charged particles spectra in events with different   charged multiplicity
  The shapes of invariant differential cross section for charged particle production as function of transverse momentum measured in $pp$ collisions by the STAR detector are analyzed. The spectra shape varies with the event charged multiplicity 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)
nucl-th hep-ph