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Dispersive analysis for eta ->gamma gamma*
Forschungszentrum Julich, Inst Kernphys Theorie, D-52425 Julich, Germany; Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany; Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics. Natl Ctr Nucl Res, High Energy Phys Dept, PL-00681 Warsaw, Poland.
Forschungszentrum Julich, Inst Kernphys Theorie, D-52425 Julich, Germany; Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany; Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany; Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany; Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany.
Forschungszentrum Julich, Inst Kernphys Theorie, D-52425 Julich, Germany.
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2013 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 73, no 12, 2668- p.Article in journal (Refereed) Published
Abstract [en]

A dispersion integral is derived that connects data on eta ->pi (+) pi (-) gamma to the eta ->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' transition form factor, . Both values are consistent with all recent data, but differ from some previous theoretical analyses.

Place, publisher, year, edition, pages
2013. Vol. 73, no 12, 2668- p.
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-214016DOI: 10.1140/epjc/s10052-013-2668-3ISI: 000328341300001OAI: oai:DiVA.org:uu-214016DiVA: diva2:684362
Funder
German Research Foundation (DFG)
Note

Correction in EUROPEAN PHYSICAL JOURNAL C, vol 75, issue 6, article no. 242, 2015, DOI: 10.1140/epjc/s10052-015-3429-2

Available from: 2014-01-08 Created: 2014-01-07 Last updated: 2017-12-06Bibliographically approved

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