Abstract
The ATLAS experiment at the Large Hadron Collider has undertaken a broad physics program to probe and characterize the hot nuclear matter created in relativistic heavy-ion collisions. This talk presents recent results on production of electroweak bosons and quarkonium, charged particles and jets, bulk particle collectivity and electromagnetic processes in ultra-peripheral collisions, from Pb+Pb and p+Pb systems.
Highlights
The Quark-Gluon Plasma (QGP) was first observed in experiments at RHIC [1,2,3,4] and since it has been intensively studied in relativistic heavy-ion (HI) collisions
Higher collision energies available at the LHC compared to RHIC, result in increased volume, lifetime and temperature of QGP
Hard probes are produced early in the HI collision, in a process whose cross section is not changed by the presence of strongly interacting medium, i.e. it can be calculated using perturbative QCD
Summary
The Quark-Gluon Plasma (QGP) was first observed in experiments at RHIC [1,2,3,4] and since it has been intensively studied in relativistic heavy-ion (HI) collisions. One can study properties of QGP using hard probes of different scales (electroweak bosons, jets, heavy quarks) or measuring parameters describing collective behaviour of the medium. Passing through the medium hard probes interact weakly or strongly with it providing information on its properties. Due to their large electric charge heavy-ions are strong sources of high energy photons. In the central collisions, when the overlap of nuclei is large, one expects a high number of Ncoll and a high number of nucleons participating in the collision, Npart. The TAA is the mean nuclear thickness function and is a measure of the nuclear overlap, i.e. of the number of nucleons which can participate in the hard scattering processes
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