Abstract
Ultra-relativistic heavy-ion collisions at the Large Hadron Collider provide a unique opportunity to study the properties of matter at extreme energy densities where a phase transition from the hadronic matter to a deconfined medium of quarks and gluons, the Quark-Gluon Plasma (QGP) is predicted. Among the prominent probes of the QGP, heavy quarks play a crucial role since they are created during the initial stages of the collision, before the QGP formation, and their number is conserved throughout the partonic and hadronic phases of the collision. The azimuthal anisotropy of charmonium production, quantified using the second harmonic Fourier coefficient (referred to as elliptic flow), provides important information on the magnitude and dynamics of charmonium production. Measurements of the quarkonium nuclear modification factor at forward rapidity and J/ψ elliptic flow in Pb-Pb collisions as a function of centrality, transverse momentum and rapidity will be presented and compared to different collision energy results and available theoretical calculations.
Highlights
IntroductionIf the system is interacting, the density anisotropy will be reflected in the particle momentum distribution
Ultra-relativistic heavy-ion collisions at the Large Hadron Collider provide a unique opportunity to study the properties of matter at extreme energy densities where a phase transition from the hadronic matter to a deconfined medium of quarks and gluons, the Quark-Gluon Plasma (QGP) is predicted
PHENIX [11] or STAR [12] experiments do not exhibit a significant J/ψ elliptic flow, their systematics are large and the measurements are compatible with the LHC results
Summary
If the system is interacting, the density anisotropy will be reflected in the particle momentum distribution. This distribution can be decomposed into a Fourier series whose second coefficient is denoted v2 and called elliptic flow. The measurement of D meson elliptic flow, recently published by ALICE [8], gives a strong hint of charm quark flow in the medium. The (re)combined cc pairs should inherit the charm quark flow a√nsdNoNn=e can expect the 2.76 TeV both. PHENIX [11] or STAR [12] experiments do not exhibit a significant J/ψ elliptic flow, their systematics are large and the measurements are compatible with the LHC results
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