2004/03/10 by H. Zhang, Zhang, H.
Physics and Astronomy · #FOS: Physical sciences #High-Energy Particle Collisions Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.48550/arxiv.nucl-ex/0403010
4 pages, 3 figures, write-up for the poster presented at Quark Matter 2004 (QM2004), Oakland, CA, USA Jan. 11-17, 2004
arxiv created 2004/03/10 · openalex publication_date 2004/03/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report the measurements of the transverse momentum spectra and invariant mass distributions of Δ(1232)→ πp, K^*(892)0,± → πK and ρ(770)0 → π+ π- in Au+Au and p+p collisions at √sNN=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^*/ϕ, Δ/p and ρ/π, the K^*, ρ and Δ 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 pT region (2