Dynamic versus Static Hadronic Structure Functions
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- 作者：Stanley J. Brodsky
- 关键词：Diffraction ; QCD ; Light-Front Wavefunctions ; Hadronization ; Multiple Scattering ; Heavy-Ion Collisions
- 刊名：Nuclear Physics A
- 出版年：2009
- 出版时间：15 August 2009
- 年：2009
- 卷：827
- 期：1-4
- 页码：327c-332c
- 全文大小：224 K
文摘
“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.