Multiplicity dependence of charged particle, ϕ meson, and multi-strange particle productions in p + p collisions at √(s) = 200 GeV from PYTHIA simulation

We report the multiplicity dependence of charged particle production for the π ^± , K^± , p , p , and ϕ mesons at |y| < 1.0 in p+p collisions at √(s) = 200 GeV from a PYTHIA simulation. The impact of multiple parton interactions and gluon contributions is studied and found to be a possible source of the splitting of the particle yields as a function of p T with respect to the multiplicity. No obvious particle species dependence of the splitting is observed. The multiplicity dependence of the ratios K^-/π ^- , K^+/π ^+ , p/π ^- , p/π ^+ , and K s 0 at mid-rapidity in p+p collisions is found to follow a tendency similar to that in Au+Au collisions at √(s_NN) = 200 GeV at the Relativistic Heavy Ion Collider, indicating similar underlying initial production mechanisms despite the differences in the initial colliding systems.