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摘要
A dispersion integral is derived that connects data on eta -%26gt;pi (+) pi (-) gamma to the eta -%26gt;gamma gamma (au) transition form factor. A detailed analysis of the uncertainties is provided. We find for the slope of the eta transition form factor at the origin . Using an additional, plausible assumption, one finds for the corresponding slope of the eta%26apos; transition form factor, . Both values are consistent with all recent data, but differ from some previous theoretical analyses.
- 出版日期2013-12-11
