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Collider Cross Talk
Collectivity in light ions [ALICE, TH]
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Europe/Zurich
4/2-011 - TH common room (CERN)
Description
Abstract
The emergence of collective effects between the final state particles produced in heavy-ion collisions has long been considered a signature of the presence of a deconfined medium produced in these collision systems. In particular the second order harmonic of the azimuthal correlation of particles puts strong limits on the equilibration time of this QCD medium and on its hydrodynamical response to pressure gradients. However, during the LHC era the emergence of such collective effects in smaller collision systems, where a deconfined medium was not expected, has presented a puzzle regarding the origin of such effects and the minimal conditions needed to produce a deconfined QCD medium. Light-ion collisions promise to provide a fascinating bridge to test these limits and to help us achieve a unified understanding across observables probing these collisions at different scales. In this talk the first measurements of the azimuthal correlation of final state particle in O-O collisions at the LHC will be presented, along with a theoretical dive into their importance in understanding the physics of many-body QCD.
Speakers
Emil Gorm Nielsen
Emil defended his PhD at the Niels Bohr Institute in November 2023 and has since been employed there as a post-doc, working on azimuthal correlations and anisotropic flow in small and large systems. He has been responsible for several measurements on anisotropic flow observables and has led studies on the correlations between flow and mean transverse momentum, which has been used to put tight constraints on the initial conditions of heavy-ion collisions and explore the possibility of a nuclear shape phase transition.
Giuliano Giacalone
Giuliano is a nuclear theorist working on the hydrodynamic model of high-energy heavy-ion collisions. He got his PhD at the end of 2020 from the Institute de Physique Théorique (IPhT) of the Université Paris-Saclay, under the supervision of Jean-Yves Ollitrault. After that, he held a postdoc position at the Institute for Theoretical Physics of the University of Heidelberg. He joined CERN-TH as a Fellow in July 2024.
