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arXiv 1004.5523nucl-ex
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在158和400 GeV质子-核碰撞中J/psi的产生

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, S. Damjanovic, A. David, A. de Falco, A. Devaux, L. Ducroux, H. En'yo, … 展开作者

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

备注：
NA60 Collaboration, accepted for publication by Phys. Lett. B
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摘要：

NA 60实验在CERN SPS研究了158和400 GeV的p-A碰撞中的J/psi产生。从产生截面比sigma_{J/psi} ^{A}/ sigma_{J/psi} ^{Be}（A=Al，Cu，In，W，Pb，U）的A依赖关系估算了J/psi产额的核效应。我们观察到一个显着的核抑制的J/psi产量每核子核子碰撞，在较低的入射能量有较大的影响，我们比较这个结果与以前的观察其他固定目标实验。通过研究核效应对靶核中相互作用部分子携带的核子动量分数x_2的依赖关系，试图解开对所观察到的抑制的不同贡献。

英文摘要：

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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