Speaker
Description
Quarkonium production has long served as a probe for heavy quark interaction with nuclear medium. In small collision systems, quarkonia can be modified by initial state effects like shadowing, and final state effect like interacting with co-moving particles. The possible signature due to potentially existing deconfined medium (Quark Gluon Plasma) need to be disentangled from all aforementioned effects, to which measurements from small to large collisions systems of different probes, such as quarkonia, are needed. In this contributions, we will present LHCb results on psi(2S) to J/psi production ratio in pp, pPb (forward and backward) and PbPb collisions, and excited-to-ground-state production ratio of Upsilon mesons in pp collisions, along with comparisons with theoretical models and other measurements.
