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

R. Arnaldi , K. Banicz , J. Castor , B. Chaurand , W. Chen , C. Cicalo , A. Colla , P. Cortese

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S. Damjanovic A. David A. de Falco A. Devaux L. Ducroux H. En'yo J. Fargeix A. Ferretti M. Floris A. Foerster P. Force N. Guettet A. Guichard H. Gulkanian J. M. Heuser M. Keil Z. Li C. Lourenco 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 A. Uras G. Usai R. Veenhof H. K. Woehri (NA60 Collaboration)

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classification ⚛️ nucl-ex

keywords nuclearproductionbeencarriedcollisionseffectssigmasuppression

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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 nucleon-nucleon collision, with a larger effect at lower incident energy, and we compare this result with previous observations by other fixed-target experiments. An attempt to disentangle the different contributions to the observed suppression has been carried out by studying the dependence of nuclear effects on x_2, the fraction of nucleon momentum carried by the interacting parton in the target nucleus.

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

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