English

Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD

High Energy Physics - Phenomenology 2009-09-11 v1

Abstract

Initial- and final-state rescattering, neglected in the parton model, have a profound effect in QCD hard-scattering reactions, predicting single-spin asymmetries, diffractive deep inelastic scattering, diffractive hard hadronic reactions, the breakdown of the Lam Tung relation in Drell-Yan reactions, and nuclear shadowing and non-universal antishadowing--leading-twist physics not incorporated in the light-front wavefunctions of the target computed in isolation. I also discuss the use of diffraction to materialize the Fock states of a hadronic projectile and test QCD color transparency, and anomalous heavy quark effects. The presence of direct higher-twist processes where a proton is produced in the hard subprocess can explain the large proton-to-pion ratio seen in high centrality heavy ion collisions. I emphasize the importance of distinguishing between static observables such as the probability distributions computed from the square of the light-front wavefunctions versus dynamical observables which include the effects of rescattering.

Keywords

Cite

@article{arxiv.0811.0875,
  title  = {Dynamic versus Static Structure Functions and Novel Diffractive Effects in QCD},
  author = {Stanley J. Brodsky},
  journal= {arXiv preprint arXiv:0811.0875},
  year   = {2009}
}

Comments

8 pages, 1 figure. Presented at Diffraction 2008: International Workshop On Diffraction In High Energy Physics 9-14 Sep 2008, La Londe-les-Maures, France

R2 v1 2026-06-21T11:38:43.296Z