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J/psi production in proton-nucleus collisions at 158 and 400 GeV
Arnaldi R., Banicz K., Castor J., Chaurand B., Chen W. M. et al
Physics Letters B 706 (2012) 263-267 - http://hal.in2p3.fr/in2p3-00479844
Physique/Physique Nucléaire Expérimentale
J/psi production in proton-nucleus collisions at 158 and 400 GeV
R. Arnaldi, K. Banicz, J. Castor1, B. Chaurand2, W. M. Chen, C. Cicalo, A. Colla, P. Cortese, S. Damjanovic, A. David, A. De Falco, A. Devaux1, L. Ducroux3, H. En'yo, J. Fargeix1, A. Ferretti, M. Floris, A. Foerster, P. Force1, N. Guettet1, A. Guichard3, H. Gulkanian, J. M. Heuser, M. Keil, Z. Li, C. Lourenco, J. Lozano, F. Manso1, 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, A. Uras, G. Usai, R. Veenhof, H. K. Woehri
1 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
2 :  LLR - Laboratoire Leprince-Ringuet
CNRS : UMR7638 – IN2P3 – Polytechnique - X
Route de Saclay - 91128 Palaiseau Cedex
3 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
The NA60 experiment has studied J/psi production in p-A collisions at 158 and 400 GeV, at the CERN SPS. Nuclear effects on the J/psi yield have been estimated from the A-dependence of the production cross section ratios sigma_{J/psi}^{A}/sigma_{J/psi}^{Be} (A=Al, Cu, In, W, Pb, U). We observe a significant nuclear suppression of the J/psi yield per N-N collision, with a larger effect at lower incident energy, and we compare this result with previous observations by fixed-target experiments. By studying, at the two energies, the dependence of nuclear effects on x_2, the fraction of nucleon momentum carried by the interacting parton from the target nucleus, we conclude that a combination of nuclear shadowing and break-up by target nucleons cannot be the only source of nuclear suppression of the J/psi.

Articles dans des revues avec comité de lecture
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 

NA60 Collaboration, 5 pages, 3 figures, submitted to Phys. Rev. Lett.
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