J/Ψ measurements with the Alice experiment at the LH C

The hot and dense nuclear matter created in nuclear collisions at relativistic energies consists of plasma of deconfined quarks and gluons. The suppression of quarkonium production in high energy nuclear collisions relative to proton proton collisions, due to the Debye screening of the quark-antiquark potential, was proposed as a signature of the formation of Quark Gluon Plasma. However, there are other effects that may impact the observed quarkonia production such as cold nuclear matter effects and statistical coalescence of quark antiquark pairs. Studies of the production of various quarkonium states in heavy-ion collisions can provide insight into the properties of the hot and dense medium created at the Large Hadron Collider (LHC) energies. In addition, systematic measurement of the quarkonia production for different colliding systems, centralities and collision energies may help to understand the quarkonium production mechanisms as well as the medium properties. The ALICE experiment at the LHC can measure the J/ Ψ down to very low transverse momentum in the di-muon and di-electron channels. We will discuss the results on charmomium obtained by ALICE and will provide comparisons with other experimental results and with theoretical calculations