  In this work, we present a study of particle production in proton-proton
collisions using data that are collected from many experiments of relative wide
range of reaction energies. These data include production of pions and heavier
particles; like keons and lambda hyperons. Proton-proton collision is a simple
system to investigate and to be considered a starting point that guides to more
complicated processes of production in the proton-nucleus and the
nucleus-nucleus collisions. In this paper, we are interested in the mechanisms
that describe the process of particle production over a wide range of
interaction energy, and how the physics of production changes with changing
energy. Besides, this work may raise a question: are heavier particles than
pions produced via the same mechanism(s) of producing pions, or these are
created differently, being different in masses and other physical properties?
