Blast-Wave Model Studies in Pb-Pb Collisions at LHC

Abstract: In high-energy heavy-ion collisions, a state of matter called quark-gluon plasma (QGP) can be created. The production of particles from the QGP can be described by different models, one of these is the blast-wave model. The blast-wave model describes the production of particles from the QGP, not from jets. The model was fitted to the existing transverse momentum spectra (pT) for pions, kaons and protons from lead-lead collisions. For low pT, the model followed the observed spectra, but not for high pT. In this work, the jet part of the spectra was subtracted to attempt to make the model describe the spectra better for high pT, and in that way understand the real limit of the model better. When the jet part of the spectra was subtracted, the model did indeed follow the spectra for higher pT. This indicates that there is not some new physics that describes the intermediate part, but that it can be described by the blast-wave model.