Rapidity divergences and valid definitions of parton densities

John Collins

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


Rapidity divergences occur when parton densities in a gauge theory are defined in the most natural way, as expectation values of partonic number operators in light-front quantization. I review these and other related divergences, and show how the definitions of parton densities can be modified to remove the divergences. A modified definition is not only essential for many phenomenolog-ical applications of QCD, but also concerns the treatment of parton densities in non-perturbative approaches. The necessity of modifications in the definition of a parton density also entails corrections in the formulation of light-front quantization for gauge theories.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2008
EventLight Cone 2008 on Relativistic Nuclear and Particle Physics, LC 2008 - Mulhouse, France
Duration: Jul 7 2008Jul 11 2008

All Science Journal Classification (ASJC) codes

  • General


Dive into the research topics of 'Rapidity divergences and valid definitions of parton densities'. Together they form a unique fingerprint.

Cite this