J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon
- Arnaldi, R.
- Banicz, K.
- Chaurand, B.
- Cicalò, C.
- Colla, A.
- Cortese, P.
- Damjanovic, S.
- David, A.
- De Falco, A.
- Devaux, A.
- Ducroux, L.
- En'Yo, H.
- Ferretti, A.
- Floris, M.
- Förster, A.
- Force, P.
- Guettet, N.
- Guichard, A.
- Gulkanyan, H.
- Heuser, J.M.
- Keil, M.
- Kluberg, L.
- Lourenço, C.
- Lozano, J.
- Manso, F.
- Martins, P.
- Masoni, A.
- Neves, A.
- Ohnishi, H.
- Oppedisano, C.
- Parracho, P.
- Pillot, Philippe
- Poghosyan, T.
- 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.
- Wöhri, H.
Publication date
January 2007
DOI Publisher
American Physical Society (APS)Abstract
5 pages, 1 table, 4 figures, accepted for publication by PRLThe NA60 experiment studies muon pair production at the CERN SPS. In this letter we report on a precision measurement of J/psi in In-In collisions. We have studied the J/psi centrality distribution, and we have compared it with the one expected if absorption in cold nuclear matter were the only active suppression mechanism. For collisions involving more than ~80 participant nucleons, we find that an extra suppression is present. This result is in qualitative agreement with previous Pb-Pb measurements by the NA50 experiment, but no theoretical explanation is presently able to coherently describe both results
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