Anomalous behavior of pion production in high energy particle collisions
  A shape of invariant differential cross section for charged hadron production as function of transverse momentum measured in various collider experiments is analyzed. Contrary to the behavior of produced charged kaons, protons and antiprotons, the pion spectra require an anomalously high contribution of an exponential term to describe the shape. 
A. A. Bylinkin (1), A. A. Rostovtsev (1) ((1) Institute for   Theoretical and Experimental Physics, ITEP, Moscow, Russia)
hep-ph hep-ex