Journal
NUCLEAR PHYSICS A
Volume 827, Issue 1-4, Pages 327C-332CPublisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysa.2009.05.068
Keywords
Diffraction; QCD; Light-Front Wavefunctions; Hadronization; Multiple Scattering; Heavy-Ion Collisions
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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 Larn-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.
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