Extracting temperature and transverse flow by fitting transverse mass spectra and HBT radii together

الأصل · EN

Single particle transverse mass spectra and HBT radii of identical pion and identical kaon are analyzed with a blast-wave parametrization under the assumptions local thermal equilibrium and transverse expansion. Under the assumptions, temperature parameter T and transverse expansion rapidity ρ are sensitive to the shapes of transverse mass mₜ spectrum and HBT radius Rₛ(Kₜ). Negative and positive correlations between T and ρ are observed by fitting mₜ spectrum and HBT radius Rₛ (Kₜ), respectively. For a Monte Carlo simulation using the blast-wave function, T and ρ are extracted by fitting mₜ spectra and HBT radii together utilizing a combined optimization function χ². With this method, T and ρ of the Monte Carlo sources can be extracted. Using this method for A Multi-Phase Transport model (AMPT) at RHIC energy, the differences of T and ρ between pion and kaon are observed obviously, and the tendencies of T and ρ vs collision energy √sₙN are similar with the results extracted directly from the AMPT model.