Counting form factors of twist-two operators

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

We present a simple method to count the number of hadronic form factors based on the partial wave formalism and crossing symmetry. In particular, we show that the number of independent nucleon form factors of spin-n, twist-2 operators (the vector current and energy-momentum tensor being special examples) is n + 1. These generalized form factors define the generalized (off-forward) parton distributions that have been studied extensively in the recent literature. In proving this result, we also show how the JPC rules for quarkonium states arise in the helicity formalism.

Original languageEnglish (US)
Article number076005
Pages (from-to)760051-760054
Number of pages4
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume63
Issue number7
StatePublished - Aug 15 2001
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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