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arxiv 1202.1383 v3 pith:2EZBTSO7 submitted 2012-02-07 hep-ex nucl-ex

J/psi suppression at forward rapidity in Pb-Pb collisions at sqrt{s_(rm NN)} = 2.76 TeV

classification hep-ex nucl-ex
keywords collisionspb-pbcollisioninclusivemeasuredproductionrapiditysqrt
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The ALICE experiment has measured the inclusive J/$\psi$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}} } = 2.76$ 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 $0.545 \pm 0.032 \rm{(stat.)} \pm 0.083 \rm{(syst.)}$ 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.

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