Pion photoproduction amplitude relations in the 1/Nc expansion

Thomas D. Cohen, Daniel C. Dakin, Richard Lebed, Daniel R. Martin

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We derive expressions for pion photoproduction amplitudes in the 1/N c expansion of QCD, and obtain linear relations directly from this expansion that relate electromagnetic multipole amplitudes at all energies. The leading-order relations in 1/Nc compare favorably with available data, while the next-to-leading-order relations seem to provide only a small improvement. However, when resonance parameters are compared directly, the agreement at O(1/Nc) or O(1/Nc2) is impressive.

Original languageEnglish (US)
Article number076010
Pages (from-to)1-12
Number of pages12
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number7
StatePublished - Apr 1 2005

ASJC Scopus subject areas

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


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