Abstract
We analyze hadron transverse momentum spectra from Pb+Pb Collisions recorded by the LHC detector ALICE. As the theoretical model we use a Monte Carlo model which includes production and decays of resonances. The transverse expansion of the fireball is shown to be stronger and the freeze-out temperature higher than in similar collisions at RHIC, where collision energy is more than ten times lower.
Highlights
Heavy atomic nuclei at room temperatures behave as liquids
If we collide two nuclei at moderate energies in a particle accelerator, the nuclei will be compressed and heated and as a result the nuclear liquid will turn into a hadron gas – a gas of pions, protons, neutrons and other hadron species
The quarks are bound inside hadrons by the strong interaction which is mediated by gluons
Summary
Heavy atomic nuclei at room temperatures behave as liquids. If we collide two nuclei at moderate energies in a particle accelerator, the nuclei will be compressed and heated and as a result the nuclear liquid will turn into a hadron gas – a gas of pions, protons, neutrons and other hadron species. Under normal conditions it is impossible to knock a single quark or gluon out of a hadron - the more we pull it, the stronger is the binding force which keeps it inside. Some signals of QGP remain in the bulk properties of the collisions such as particle rates, transverse flow, chemical freeze-out temperature Tch and kinetic freeze-out temperature Tkin. These quantities can be studied via hadron spectra measured by the detectors. The model is implemented as a Monte Carlo generator published under the title DRAGON [4]
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