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

Abstract

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

6 pages, 11 figures