= LPAIR Analysis = -- Introduction This study is meant to investigate the parton distribution function in LPAIR Monte Carlo generator (link) w.r.t. the inelastic collision when the incoming proton breaks up into a hadronic final state. The built-in options in LPAIR make use of two parametrizations for the parton densities inside the proton, namely BRASSE [ref] and SURI-YENNIE [ref].