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arXiv nucl-th/0302002nucl-thhep-ph
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d+Au在RHIC上的初态部分子展宽和能量损失

Initial State Parton Broadening and Energy Loss Probed in d+Au at RHIC

Ivan Vitev

摘要:

在pQCD多重弹性散射框架下,计算了RHIC下$\sqrt{s}_{NN}=200$ GeV的$d+Au$反应中无质量π介子的碰撞参量和Cronin效应对快度的依赖关系.我们引入了一种在微扰计算中加入初态能量损失的形式,并考虑了弹性能量损失和部分子的横向动量展宽,我们认为克罗宁效应的中心依赖性可以区分RHIC中不同的强子产生方案.它的幅度和快度的依赖性进行重要的实验信息的冷核物质的性质的中等和大- $x$ antishadowing/EMC地区。

英文摘要:

The impact parameter and rapidity dependence of the Cronin effect for massless pions in $d+Au$ reactions at $\sqrt{s}_{NN}=200$ GeV at RHIC is computed in the framework of pQCD multiple elastic scattering on a nuclear target. We introduce a formalism to incorporate initial state energy loss in perturbative calculations and take into account the elastic energy loss in addition to the transverse momentum broadening of partons.We argue that the centrality dependence of the Cronin effect can distinguish between different hadron production scenarios at RHIC. Its magnitude and rapidity dependence are shown to carry important experimental information about the properties of cold nuclear matter up to the moderate- and large-$x$ antishadowing/EMC regions.

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