Multiplicity-dependent charmonia production with ALICE and collective phenomena in O-O collisions at LHC energies

Abstract

The study of ultra-relativistic heavy-ion collisions has emerged as a powerful approach to explore the fundamental properties of nuclear matter under extreme conditions of temperature and energy density. One of the primary goals of such studies is to create and understand the characteristics of a deconfined state of matter known as the quark-gluon plasma (QGP), where quarks and gluons are no longer confined within hadrons. This state is believed to have existed in the early Universe, microseconds after the Big Bang. The ALICE experiment at the CERN Large Hadron Collider (LHC) provides a unique opportunity to investigate this QCD matter through collisions of protons and heavy ions at unprecedented energies. This thesis is focused on probing the QGP through two major studies: (i) experimental analysis on a multiplicity dependent charmonia production with ALICE and (ii) a phenomenological investigation of collective dynamics in oxygenoxygen (O–O) collisions at LHC energies using a multi-phase transport model (AMPT).