High energy hadrons in EAS at mountain altitude
  An extensive simulation has been carried out to estimate the physical interpretation of dynamical factors such as <Rh>, <Eh x Rh> in terms of high energy interaction features, concentrated in the present analysis on the average transverse momentum. It appears that the large enhancement observed for <Eh x Rh> versus primary energy, suggesting in earliest analysis a significant rise of <pt> with energy, is only the result of the limited resolution of the detectors and remains in agreement with a wide range of models used in simulations. 
J. N. Capdevielle (1), J. Gawin (2), D. Sobczynska (3), B. Szabelska   (2), J. Szabelski (2), T. Wibig (3) ((1) LPC, College...