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

Giuliano Giacalone