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We report the multiplicity dependence of charged particle productions for$\pi^{\pm}$, $K^{\pm}$, $p$, $\overline{p}$ and $\phi$ meson at $|y| < 1.0$ inp+p collisions at $\sqrt{\rm s}$ = 200 GeV with $\rm PYTHIA$ simulation. Theimpact of parton multiple interactions and gluon contributions is studied andfound to be possible sources of the particle yields splitting as a function of$p_T$ with respect to multiplicity. No obvious particle species dependence forthe splitting is observed. The multiplicity dependence on ratios of$K^-/\pi^-$, $K^+/\pi^+$, $\overline{p}/\pi^-$, $p/\pi^+$ and$\Lambda/K^{0}_{s}$ in mid-rapidity in p+p collisions is found following thesimilar tendency as that in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV fromRHIC, which heralds the similar underlying initial production mechanismsdespite the differences in the initial colliding systems.

nuclear science and techniques/nuclear science and techniques

Multiplicity Dependence of Charged Particle, $\phi$ Meson and  Multi-strange Particle Productions in p+p Collisions at $\sqrt{\rm s}$ = 200  GeV with PYTHIA Simulation