Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-03-10
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 3 figures, write-up for the poster presented at Quark Matter 2004 (QM2004), Oakland, CA, USA Jan. 11-17, 2004
Scientific paper
We report the measurements of the transverse momentum spectra and invariant mass distributions of $\Delta$(1232)$\to \pi p$, $K^*$(892)$^{0,\pm} \to \pi K$ and $\rho$(770)$^{0} \to \pi^{+} \pi^{-}$ in Au+Au and p+p collisions at $\sqrt{s_{NN}}$=200 GeV using the STAR TPC at RHIC. These resonances provide sensitive probes to examine the evolution dynamics in the hadronic medium through their decay and regeneration processes. The particle ratios of $K^*/K$, $K^*/\phi$, $\Delta$/p and $\rho/\pi$, the $K^*$, $\rho$ and $\Delta$ apparent masses and the dependence of these quantities on centrality provide evidence of dynamical interaction and re-scattering between hadrons close to freeze-out. The dependence of resonance yields on the strength of their hadronic cross sections and the lifetime between the freeze-outs will also be discussed. In the intermediate $p_{T}$ region ($2
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