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Author  |
Holz, S.; Plenter, J.; Xiao, C.W.; Dato, T.; Hanhart, C.; Kubis, B.; Meissner, U.G.; Wirzba, A. |
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Title |
Towards an improved understanding of eta -> gamma*gamma * |
Type |
Journal Article |
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Year |
2021 |
Publication |
European Physical Journal C |
Abbreviated Journal |
Eur. Phys. J. C |
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Volume |
81 |
Issue |
11 |
Pages |
1002 - 15pp |
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Abstract |
We argue that high-quality data on the reaction e(+)e(-) -> pi(+) pi(-) eta will allow one to determine the doubly-virtual form factor eta -> gamma*gamma* in a model-independent way with controlled accuracy. This is an important step towards a reliable evaluation of the hadronic light-by-light scattering contribution to the anomalous magnetic moment of themuon. When analyzing the existing data for e(+) e(-) -> pi(+) pi(-) eta for total energies squared k(2) > 1GeV(2), we demonstrate that the effect of the a(2) meson provides a natural breaking mechanism for the commonly employed factorization ansatz in the doubly-virtual form factor F-eta gamma*gamma* (q(2), k(2)). However, better data are needed to draw firm conclusions. |
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Address |
[Holz, S.; Plenter, J.; Dato, T.; Kubis, B.; Meissner, U-G] Univ Bonn, Helmholtz Inst Strahlen & Kemphys Theorie, D-53115 Bonn, Germany, Email: holz@hiskp.uni-bonn.de; |
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Publisher |
Springer |
Place of Publication |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
1434-6044 |
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Notes |
WOS:000718113500001 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
5024 |
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