%0 Generic %1 Hanhart2013Dispersive %A Hanhart, C. %A Kupsc, A. %A Meißner, U. G. %A Stollenwerk, F. %A Wirzba, A. %D 2013 %K eta %T Dispersive analysis for \$\eta\gamma\gamma^*\$ %U http://arxiv.org/abs/1307.5654 %X A dispersion integral is derived that connects data on \$\eta\to \pi^+\pi^-\gamma\$ to the \$\eta\gamma\gamma^*\$ 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 \$b\_= (2.05 ^+0.22\_-0.10) GeV^-2\$. Using an additional, plausible assumption, one finds for the corresponding slope of the \$\eta'\$ transition form factor, \$b\_\eta' = (1.58 ^+0.18\_-0.13) GeV^-2\$. Both values are consistent with all recent data, but differ from some previous theoretical analyses.

@misc{Hanhart2013Dispersive, abstract = {A dispersion integral is derived that connects data on \$\eta\to \pi^+\pi^-\gamma\$ to the \$\eta\to \gamma\gamma^*\$ 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 \$b\_\eta = (2.05 {}^{+0.22}\_{-0.10}) {GeV}^{-2}\$. Using an additional, plausible assumption, one finds for the corresponding slope of the \$\eta'\$ transition form factor, \$b\_{\eta'} = (1.58 {}^{+0.18}\_{-0.13}) {GeV}^{-2}\$. Both values are consistent with all recent data, but differ from some previous theoretical analyses.}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Hanhart, C. and Kupsc, A. and Mei{\ss}ner, U. G. and Stollenwerk, F. and Wirzba, A.}, biburl = {https://www.bibsonomy.org/bibtex/25c3b2090d5a11fddd37a7a2af3bd76ff/cmcneile}, citeulike-article-id = {12522175}, citeulike-linkout-0 = {http://arxiv.org/abs/1307.5654}, citeulike-linkout-1 = {http://arxiv.org/pdf/1307.5654}, day = 22, eprint = {1307.5654}, interhash = {20d627d0cdbc03d3d888d9472427ea51}, intrahash = {5c3b2090d5a11fddd37a7a2af3bd76ff}, keywords = {eta}, month = jul, posted-at = {2013-07-23 08:53:18}, priority = {2}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Dispersive analysis for \$\eta\to \gamma\gamma^*\$}}, url = {http://arxiv.org/abs/1307.5654}, year = 2013 }