Final state interactions and gauge invariant parton distributions

A. V. Belitsky, X. Ji, F. Yuan

Research output: Contribution to journalArticlepeer-review

577 Scopus citations


Parton distributions contain factorizable final state interaction effects originating from the fastmoving struck quark interacting with the target spectators in deeply inelastic scattering. We show that these interactions give rise to gauge invariance of the transverse momentum-dependent parton distributions. As compared to previous analyses, our study demonstrates the existence of extra scaling contributions from transverse components of the gauge potential at the light-cone infinity. They form a transverse gauge link which is indispensable for restoration of the gauge invariance of parton distributions in the light-cone gauge where the gauge potential does not vanish asymptotically. Our finding helps to explain a number of features observed in a model calculation of structure functions in the light-cone gauge.

Original languageEnglish (US)
Pages (from-to)165-198
Number of pages34
JournalNuclear Physics B
Issue number1-2
StatePublished - Apr 21 2003
Externally publishedYes


  • Dipole scattering
  • Final state interactions
  • Light-cone gauge
  • Parton distributions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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