Soft Particle Spectra at STAR

Abstract

We presented the multiplicity and the spectra of many particles in Au+Au at sqrt(s_{_{NN}})=130 GeV measured by STAR detector. Their connections to initial condition, baryon creation, freeze-out condition and strangeness enhancement were discussed.

Figures (5)

• Figure 1: Left: mean $p_{T}$ of $h^{-},N_{ch}$ as a function of $\sqrt{s_{_{NN}}}$ for $pp,\bar{p}p$ and central $AA$ collisions. Right: mean $p_{T}$ of $N_{ch}$ as a function of $N_{ch}$ at $\sqrt{s_{_{NN}}}=130$ GeV. Curves are from Eq.1.
• Figure 2: $dN/dy$ of $\bar{p}$ ,$\Lambda$, $\bar{\Lambda}$ as a function of $h^{-}$. Linear dependence can describe the data well.
• Figure 3: Left: $p_{T}$ spectra of pseudoscalar and vector meson, hyperon and strange meson, baryon and meson. Right: Inverse slope of the transerve spectra vs mass of the particle. The errors are statistical only. The systematical uncertainty of STAR data is 10-15% depending on particles.
• Figure 4: Left: $m_{T}$ spectrum of $K^{\star0}$ in 14% most central Au+Au collisions. Right: $K^{\star0}/K$ and $\phi/K^{\star0}$ ratios vs beam energy in elementary collisions and central Au+Au collisions.
• Figure 5: The measured differiential yield at $p_{T}\simeq0.4$ GeV/$c$ as function of particle's atomic number $A$ for $p,\bar{p},\bar{d},\overline{^{3}He}$.