HAL : in2p3-00176311, version 1
 arXiv : 0706.4361
 Physical Review Letters 99 (2007) 132302
 J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon
 NA60 Collaboration(s)
 (2007)
 The 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.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0706.4361
 in2p3-00176311, version 1 http://hal.in2p3.fr/in2p3-00176311 oai:hal.in2p3.fr:in2p3-00176311 Contributeur : Sylvie Florès <> Soumis le : Mercredi 3 Octobre 2007, 11:10:07 Dernière modification le : Mercredi 3 Octobre 2007, 11:54:06