J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon

R. Arnaldi; K. Banicz; B. Chaurand; C. Cicalò; A. Colla; P. Cortese; S. Damjanovic; A. David; A. De Falco; A. Devaux; L. Ducroux; H. En'yo; A. Ferretti; M. Floris; A. Förster; P. Force; N. Guettet; A. Guichard; H. Gulkanyan; J.M. Heuser; M. Keil; L. Kluberg; C. Lourenço; J. Lozano; F. Manso; P. Martins; A. Masoni; A. Neves; H. Ohnishi; C. Oppedisano; P. Parracho; P. Pillot; T. Poghosyan; 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. Wöhri

HAL : in2p3-00176311, version 1

arXiv : 0706.4361

DOI : 10.1103/PhysRevLett.99.132302

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Physical Review Letters 99 (2007) 132302

J/$\psi$ production in Indium-Indium collisions at 158 GeV/nucleon

R. Arnaldi, K. Banicz, B. Chaurand¹, C. Cicalò, A. Colla, P. Cortese, S. Damjanovic, A. David, A. De Falco, A. Devaux², L. Ducroux³, H. En'yo, A. Ferretti, M. Floris, A. Förster, P. Force², N. Guettet, A. Guichard³, H. Gulkanyan, J.M. Heuser, M. Keil, L. Kluberg¹, C. Lourenço, J. Lozano, F. Manso², P. Martins, A. Masoni, A. Neves, H. Ohnishi, C. Oppedisano, P. Parracho, P. Pillot³, T. Poghosyan, G. Puddu, E. Radermacher, P. Ramalhete, P. Rosinsky, E. Scomparin, J. Seixas, S. Serci, R. Shahoyan, P. Sonderegger, H.J. Specht, R. Tieulent³, G. Usai, R. Veenhof, H. Wöhri

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.

1 :	LLR - Laboratoire Leprince-Ringuet

2 :	LPC-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand

3 :	IPNL - Institut de Physique Nucléaire de Lyon

Thème(s)

Physique/Physique Nucléaire Expérimentale

Lien vers le texte intégral :

http://fr.arXiv.org/abs/0706.4361


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Soumis le : Mercredi 3 Octobre 2007, 11:10:07
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