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arXiv 0901.0781hep-ph
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动态与静态强子结构函数

Dynamic versus Static Hadronic Structure Functions

Stanley J. Brodsky

摘要:

“静态”结构函数是从目标强子的光阵面波函数的平方计算的概率分布。相反,在深度非弹性轻子-强子散射中测量的“动态”结构函数包括与威尔逊线相关的再散射效应。在部分子模型中被忽略的初态和终态再散射,可以在QCD硬散射反应中产生深远的影响,产生单自旋不对称,衍射深度非弹性散射,衍射硬强子反应,Drell-Yan反应中Lam-Tung关系的破裂,核阴影,和非普遍的核反阴影-新的领导扭曲物理不纳入孤立计算的目标的光前波函数。我还回顾了如何“直接”高扭曲过程-其中质子产生的硬子过程本身-可以解释异常质子-π介子比看到高中心重离子碰撞。

英文摘要:

"Static" structure functions are the probabilistic distributions computed from the square of the light-front wavefunctions of the target hadron. In contrast, the "dynamic" structure functions measured in deep inelastic lepton-hadron scattering include the effects of rescattering associated with the Wilson line. Initial- and final-state rescattering, neglected in the parton model, can have a profound effect in QCD hard-scattering reactions, producing single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam-Tung relation in Drell-Yan reactions, nuclear shadowing, and non-universal nuclear antishadowing--novel leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also review how "direct" higher-twist processes -- where a proton is produced in the hard subprocess itself -- can explain the anomalous proton-to-pion ratio seen in high centrality heavy ion collisions.

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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