J/$ψ$ suppression in In-In collisions at 158 GeV/nucleon

Arnaldi, R.; Arnaldi, NA60 Collaboration R.; Averbeck, R.; Banicz, K.; Castor, J.; Chaurand, B.; Cicalo', C.; Colla, A.; Cortese, P.; Damjanovic, S.; David, A.; DeFalco, A.; Devaux, A.; Drees, A.; Ducroux, L.; En'yo, H.; Ferretti, A.; Floris, M.; Forster, A.; Force, P.; Guettet, N.; Guichard, A.; Gulkanian, H.; Heuser, J.; Keil, M.; Kluberg, L.; Lourenco, C.; Lozano, J.; Manso, F.; Masoni, A.; Martins, P.; Neves, A.; Ohnishi, H.; Oppedisano, C.; Parracho, P.; Pillot, P.; Puddu, G.; Radermacher, E.; Ramalhete, P.; Rosinsky, P.; Scomparin, E.; Seixas, J.; Serci, S.; Shahoyan, R.; Sonderegger, P.; Specht, H. J.; Tieulent, R.; Usai, G.; Veenhof, R.; Wohri, H. K.

J/$ψ$ suppression in In-In collisions at 158 GeV/nucleon

Authors

Arnaldi, R.

Arnaldi, NA60 Collaboration R.

Description

The NA60 experiment has studied J/$ψ$ 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/$ψ$ production, obtained with an analysis technique based only on the J/$ψ$ sample, indicates that a suppression beyond that induced by nuclear absorption is present in In-In collisions, setting in at $\sim$80 participant nucleons. A first study of the systematic errors related with this measurement is discussed. We also present preliminary results on the J/$ψ$ azimuthal distributions.
8 pages, 3 figures, proceedings of Hard Probes 2006 International Conference