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arXiv 1208.2667nucl-thnucl-ex
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sqrt（S_NN）= 200 GeV时d+Au碰撞中J/psi产生核修正的碰撞参量依赖性

Impact parameter dependence of the nuclear modification of J/psi production in d+Au collisions at sqrt(S_NN) = 200 GeV

D. C. McGlinchey, A. D. Frawley, R. Vogt

备注：
11 pages, 11 figures. Expanded discussion of methods, and added extensive comparison of effective absorption cross sections with lower energy data, and with theory. Corrected minor typos in table 1, corrected typos in best fit parameters for Fig. 8
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摘要：

利用有效吸收截面和EPS 09非线性光学阴影模型拟合了sqrt（s_NN）= 200 GeV d+Au {J/J}数据的中心依赖关系，该数据在12个快度仓中测量，跨度为-2.2 < y < 2.4。阴影贡献的中心性依赖被允许非线性地变化，采用各种假设，以努力探索从数据中可以确定的限制。有效吸收截面和遮蔽参数化的碰撞参量依赖性是足够不同的，可以单独确定。研究发现，阴影的起始是碰撞参量的高度非线性函数。中期和向后的快度吸收截面进行了比较，较低的能量数据，并为0.05 fm/c或更大的时间，在很宽的范围内的碰撞能量和rapidities的数据很好地描述了一个模型，其中的吸收截面只取决于在核中花费的时间。

英文摘要：

The centrality dependence of sqrt(s_NN)= 200 GeV d+Au {J/ψ} data, measured in 12 rapidity bins that span -2.2 < y < 2.4, has been fitted using a model containing an effective absorption cross section combined with EPS09 NLO shadowing. The centrality dependence of the shadowing contribution was allowed to vary nonlinearly, employing a variety of assumptions, in an effort to explore the limits of what can be determined from the data. The impact parameter dependencies of the effective absorption cross section and the shadowing parameterization are sufficiently distinct to be determined separately. It is found that the onset of shadowing is a highly nonlinear function of impact parameter. The mid and backward rapidity absorption cross sections are compared with lower energy data and, for times of 0.05 fm/c or greater, data over a broad range of collision energies and rapidities are well described by a model in which the absorption cross section depends only on time spent in the nucleus.

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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