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arxiv: nucl-ex/0701033 · v1 · submitted 2007-01-22 · ⚛️ nucl-ex

J/psi suppression in In-In collisions at 158 GeV/nucleon

R. Arnaldi , et al , NA60 Collaboration R.Arnaldi , R.Averbeck , K.Banicz , J.Castor , B.Chaurand , C.Cicalo'
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A.Colla P.Cortese S.Damjanovic A.David A.DeFalco A.Devaux A. Drees L.Ducroux H.En'yo A.Ferretti M.Floris A.Forster P.Force N.Guettet A.Guichard H.Gulkanian J.Heuser M.Keil L.Kluberg C.Lourenco J.Lozano F.Manso A.Masoni P.Martins A.Neves H.Ohnishi C.Oppedisano P.Parracho P.Pillot G.Puddu E.Radermacher P.Ramalhete P.Rosinsky E.Scomparin J.Seixas S.Serci R.Shahoyan P.Sonderegger H.J.Specht R.Tieulent G.Usai R.Veenhof H.K.Wohri
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The NA60 experiment has studied J/$\psi$ production in Indium-Indium collisions at 158 A$\cdot$GeV. In this paper we present an updated set of results obtained with the complete set of available statistics and an improved alignment of the vertex tracker. The centrality dependence of the J/$\psi$ production, obtained with an analysis technique based only on the J/$\psi$ sample, indicates that a suppression beyond that induced by nuclear absorption is present in In-In collisions, setting in at $\sim$80 participant nucleons. A first study of the systematic errors related with this measurement is discussed. We also present preliminary results on the J/$\psi$ azimuthal distributions.

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