LHCf: physics results on forward particle production at LHC

The LHCf experiment is dedicated to the measurement of very forward particle production in the high energy hadron-hadron collisions at LHC, with the aim of improving the cosmic-ray air shower developments models. The detector has taken data in p-p collisions at $\sqrt s$ = 900 GeV, 2.76 TeV and 7 TeV, and in p/Pb collisions at $\sqrt s$ = 5 TeV. The results of forward production spectra of photons, neutral pions and neutrons, compared with the models most widely used in the High Energy Cosmic Ray physics, are presented in this paper.