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

R. Arnaldi; NA60 Collaboration R. Arnaldi; R. Averbeck; K. Banicz; J. Castor; B. Chaurand; C. Cicalo'; 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

doi:10.1016/j.nuclphysa.2006.11.081

paper

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

arXiv:nucl-ex/0701033 · doi:10.1016/j.nuclphysa.2006.11.081

Abstract

The NA60 experiment has studied J/ $I ¨ $ 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/ $I ¨ $ production, obtained with an analysis technique based only on the J/ $I ¨ $ 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/ $I ¨ $ azimuthal distributions.

8 pages, 3 figures, proceedings of Hard Probes 2006 International Conference

J/I¨ suppression in In-In collisions at 158 GeV/nucleon

Abstract

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