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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-CLERMONT - Laboratoire de Physique Corpusculaire de Clermont-Ferrand
http://clrwww.in2p3.fr/
CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
Campus des Cézeaux 24, avenue des Landais BP 80026 63171 Aubière Cedex
France
2 :  LLR - Laboratoire Leprince-Ringuet
http://polywww.in2p3.fr/
CNRS : UMR7638 – IN2P3 – Polytechnique - X
Route de Saclay - 91128 Palaiseau Cedex
France
3 :  IPNL - Institut de Physique Nucléaire de Lyon
http://www.ipnl.in2p3.fr/
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I
France
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.
NA60

Articles dans des revues avec comité de lecture
2012
Physics Letters B (Phys. Lett. B)
Publisher Elsevier
ISSN 0370-2693 
706
263-267

NA60 Collaboration, 5 pages, 3 figures, submitted to Phys. Rev. Lett.
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1004.5523