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arXiv 0811.0790hep-ph
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RHIC J/psi难题可以在LHC解决吗?

Can the RHIC J/psi puzzle(s) be settled at LHC?

L. Bravina, A. Capella, E. G. Ferreiro, A. B. Kaidalov, K. Tywoniuk, E. Zabrodin

摘要:

在RHIC的核-核(AA)碰撞中,人们观察到对硬探针的强烈抑制效应,例如J/psi或高pT粒子的产生。令人惊讶的是,抑制的幅度与SPS非常相似。为了确定这些特征是否是由于碰撞过程中形成的热化夸克和胶子系统的存在而产生的,人们应该研究没有明确涉及这种状态的抑制机制的影响。我们在Glauber-Gribov理论中计算了胶子的阴影效应,并提出了一个模型,该模型调用了由能量动量守恒效应驱动的依赖于速度的吸收机制。此外,由于与共同运动的物质(强子或前强子)的相互作用的最终状态抑制已被证明可以描述SPS的数据。我们扩展了这个模型,包括反向反应通道,即重组的开放魅力,这是估计直接从PP数据在RHIC。预言了在LHC的pA和AA碰撞中粲偶素的强抑制。这与假设QGP形成和重夸克热化的模型的预测形成鲜明对比。

英文摘要:

One observes strong suppression effects for hard probes, e.g. the production of J/psi or high-pT particles, in nucleus-nucleus (AA) collisions at RHIC. Surprisingly, the magnitude of the suppression is quite similar to that at SPS. In order to establish whether these features arise due to the presence of a thermalized system of quarks and gluons formed in the course of the collision, one should investigate the impact of suppression mechanisms which do not explicitly involve such a state. We calculate shadowing for gluons in the Glauber-Gribov theory and propose a model invoking a rapidity-dependent absorptive mechanism motivated by energy-momentum conservation effects. Furthermore, final state suppression due to interaction with co-moving matter (hadronic or pre-hadronic) has been shown to describe data at SPS. We extend this model by including the backward reaction channel, i.e. recombination of open charm, which is estimated directly from pp data at RHIC. Strong suppression of charmonium both in pA and AA collisions at LHC is predicted. This is in stark contrast with the predictions of models assuming QGP formation and thermalization of heavy quarks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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