The low-energy theorem of pion photoproduction using the Skyrme model

Tamio Ikehashi*, Koichi Ohta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We reassess the validity of the current-algebra based low-energy theorem of pion photoproduction on the nucleon using the Skyrme model. We find that one of the off-shell electromagnetic form factors of the nucleon exhibits infrared divergence in the chiral limit. This contribution introduces an additional term to the threshold amplitude predicted by the low-energy theorem. The emergence of the additional term indicates an unavoidable necessity of off-shell form factors in deriving the low-energy theorem. In the case of neutral pion production, the new contribution to the threshold amplitude is found to be comparable in magnitude to the low-energy theorem's prediction and has the opposite sign. In the charged pion production channels, the correction to the theorem is shown to be relatively small.

Original languageEnglish
Pages (from-to)443-471
Number of pages29
JournalNuclear Physics, Section A
Issue number4
Publication statusPublished - 1995 Oct 2
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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