Seminar in Hadronic Physics

A blast-wave model with two freeze-outs

Kang-Seog Lee

Chon-Nam University

Firstly, analysis of hadron production in heavy-ion collisions at various beam energies will reviewed. Hadron multiplicities or ratios among them are well described within a statistical model with a common temperature T and baryon and strange chemical potentials. Transverse mass spectra of various hadrons are also nicely fitted with a blast-wave model with temperature T, which is smaller than the previous on. And then, a blast-wave model, which assumes that chemical freeze-out occurs first and then later at lower temperature thermal freeze-out occurs, will be discussed. The model is applied to the ratios and slopes of transverse mass spectra measured at RHIC. In this analysis mt spectra of various hadrons are nicely fitted with a single overall constant, whereas in the usual blast-wave fit normalization is needed for each hadron.