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

Tamio Ikehashi, Koichi Ohta

研究成果: Article

抜粋

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.

元の言語English
ページ(範囲)443-471
ページ数29
ジャーナルNuclear Physics, Section A
592
発行部数4
DOI
出版物ステータスPublished - 1995 10 2
外部発表Yes

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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