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J/psi production in proton-nucleus collisions at 158 and 400 GeV

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00479844
Contributor : Sylvie Flores <>
Submitted on : Monday, May 3, 2010 - 9:23:41 AM
Last modification on : Thursday, March 19, 2020 - 9:54:46 AM

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R. Arnaldi, K. Banicz, J. Castor, B. Chaurand, W. Chen, et al.. J/psi production in proton-nucleus collisions at 158 and 400 GeV. Physics Letters B, Elsevier, 2012, 706, pp.263-267. ⟨10.1016/j.physletb.2011.11.042⟩. ⟨in2p3-00479844⟩

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