arXiv 0907.50042009-07nucl-ex

固定靶实验中p-A和A-A碰撞的J/psi产生

J/psi production in p-A and A-A collisions at fixed target experiments

Roberta Arnaldi

备注：: 8 pages, 8 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee
发表信息：: Nucl.Phys.A830:345c-352c,2009
DOI：: 10.1016/j.nuclphysa.2009.10.030

摘要：

Charmonia抑制是形成去限制介质的主要特征之一。然而，与热介质的产生无关的核效应也会影响J/psi产额。因此，从p-A碰撞的研究中确定核物质中的J/psi行为对于正确量化由去限制介质引起的charmonia抑制的量是极其重要的。本文介绍了在158 GeV入射能量下，即在与In-In（NA_（60））和Pb-Pb（NA_（50））数据相同的运动学条件下，新获得的NA_（60）结果，并与其它固定靶实验的p-A测量结果进行了比较。考虑到冷核物质对J/psi产生产额的影响的新的可用信息，A-A碰撞的结果也进行了审查。最后，J/psi极化的结果显示为p-A和A-A碰撞。

英文摘要：

Charmonia suppression is one of the main signatures for the formation of a deconfined medium. However, also nuclear effects, not related to the production of a hot medium, can affect the J/psi yield. The determination, from the study of p-A collisions, of the J/psi behaviour in nuclear matter is, therefore, extremely important to correctly quantify the amount of charmonia suppression induced by the deconfined medium. In this paper the new NA60 results collected at 158 GeV incident energy, i.e. under the same kinematical conditions as the In-In (NA60) and Pb-Pb (NA50) data, are presented and compared with p-A measurements from other fixed target experiments. Results on A-A collisions are also reviewed taking into account the new available information on the influence of cold nuclear matter on the J/psi production yield. Finally, results on the J/psi polarization are shown for p-A and A-A collisions.

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