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arXiv 0901.3054hep-ph
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质子-核碰撞中J/psi吸收的能量依赖性

Energy dependence of J/psi absorption in proton-nucleus collisions

Carlos Lourenco, Ramona Vogt, Hermine K. Woehri

备注：
23 pages, 11 figures, 7 tables
发表信息：
JHEP 0902:014,2009
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摘要：

在高能重离子碰撞中夸克-胶子等离子体的形成过程中，粲偶素态将被显著抑制。然而，一个强大的识别的抑制模式的签名的去限制QCD介质需要详细的了解“正常的核吸收”已经存在于质子-核碰撞，在那里的粲偶素生产截面增加小于线性与目标核子的数量。我们分析了J/psi生产截面测量质子-核碰撞在固定靶实验中，质子束能量从200到920 GeV，并在d-Au碰撞在RHIC，在sqrt（s）=200 GeV，在框架内的Glauber形式主义，使用几套部分子分布和没有核修改。结果揭示了“吸收截面”对J/psi运动学和碰撞能量的显着依赖性。外推所观察到的模式，我们得到预期的吸收水平在Elab=158 GeV，在该能量的重离子数据集收集在欧洲核子研究中心SPS。

英文摘要：

Charmonium states are expected to be considerably suppressed in the case of quark-gluon plasma formation in high-energy heavy-ion collisions. However, a robust identification of suppression patterns as signatures of a deconfined QCD medium requires a detailed understanding of the "normal nuclear absorption" already present in proton-nucleus collisions, where the charmonium production cross sections increase less than linearly with the number of target nucleons. We analyse the J/psi production cross sections measured in proton-nucleus collisions in fixed target experiments, with proton beam energies from 200 to 920 GeV, and in d-Au collisions at RHIC, at sqrt(s)=200 GeV, in the framework of the Glauber formalism, using several sets of parton distributions with and without nuclear modifications. The results reveal a significant dependence of the "absorption cross section" on the kinematics of the J/psi and on the collision energy. Extrapolating the observed patterns we derive the level of absorption expected at Elab=158 GeV, the energy at which the heavy-ion data sets were collected at the CERN SPS.

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