Relazione su invito

Recent theoretical developments in heavy-ion collisions.

Beraudo A.
  Mercoledì 28/09   16:30 - 19:00   Edificio CLA - Aula T3   I - Fisica nucleare e subnucleare
Relativistic heavy-ion collisions offer the possibility to explore the phase-diagram of QCD in the regime of high temperature and vanishing/low baryon density, where one expects to produce a deconfined plasma of quarks and gluons. Besides looking for signatures of the onset of deconfinement, one wishes to characterize the properties of the produced matter, which turns out to be opaque to the passage of high-$P_{T}$ particles and to display a collective behavior. Various theoretical tools have been developed over the last years to achieve this goal, among which hydrodynamic and transport codes and QCD calculations for the quenching of jets in a hot and dense medium. The major novelty of the last few years has been the discovery of final-state medium effects even in small systems, like the ones produced in proton-nucleus and high-multiplicity proton-proton collisions, leading one to wonder how small a deconfined collective system can be. During my talk I will try to give a general overview on the above issues, mentioning, in the final part, possible non-perturbative topological aspects of QCD which can be studied in heavy-ion collisions.