J/&[psi] measurements in p-Pb collisions with the ALICE detector

Relativistic heavy-ion collisions are a unique tool to study the properties of the deconfined state of quarks and gluons, the Quark-Gluon Plasma (QGP).Dissociation of J/ψ is thought as one of the strongest evidences of QGP formation in nucleus-nucleus collisions. At LHC energies, regeneration of J/ψ from thermalized charm quarks is also expected to be significant.
In order to discuss the QGP effects in relativistic heavy-ion collisions, the understanding of cold nuclear matter effects such as gluon shadowing, gluon saturation, and nuclear absorption is crucial. proton-nucleus collisions are suited for the study of the cold nuclear matter effects.
In 2013 and 2016, p-Pb collisions were recorded with the ALICE detector at the LHC. In this talk, we will show the nuclear modification factor (R_pPb) and the event activity dependence of J/ψ production. We will also discuss cold nuclear matter effects of J/ψ production at the LHC energies by comparing the data to theoretical calculations.