J/ψ Suppression at Forward Rapidity in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV

The ALICE experiment has measured the inclusive J/Psi production in Pb-Pb collisions at √sNN = 2:76 TeV down to zero transverse momentum in the rapidity range 2:5<y<4. A suppression of the inclusive J/Psi yield in Pb-Pb is observed with respect to the one measured in pp collisions scaled by the number of binary nucleon-nucleon collisions. The nuclear modification factor, integrated over the 0%–80% most central collisions, is 0.545 +/- 0.032 (stat) +/- 0.083 (syst) and does not exhibit a significant dependence on the collision centrality. These features appear significantly different from measurements at lower collision energies. Models including J/Psi production from charm quarks in a deconfined partonic phase can describe our data.