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تسجيل مستخدم جديدJ/$psi$ suppression in In-In collisions at 158 GeV/nucleon
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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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