Charmonia in Heavy Ion Collisions

The understanding of J/psi production is an extremely complicate issue. On one hand, charmonia suppression represents one of the main signatures for the formation of a deconfined medium in A-A collisions. On the other hand, also nuclear effects, not related to the production of a hot medium, may affect the J/psi yield. Therefore, the understanding of charmonia behaviour in p-A or d-A collisions is extremely important to quantify the amount of suppression due to the deconfined medium. In this talk recent results obtained from SPS and RHIC experiments with p-A, d-A and A-A collisions will be reviewed. Expectations for the incoming LHC charmonia measurements will also be presented. (author)