@Article{Holz_etal2021,
author="Holz, S.
and Plenter, J.
and Xiao, C. W.
and Dato, T.
and Hanhart, C.
and Kubis, B.
and Meissner, U. G.
and Wirzba, A.",
title="Towards an improved understanding of eta -> gamma*gamma *",
journal="European Physical Journal C",
year="2021",
publisher="Springer",
volume="81",
number="11",
pages="1002--15pp",
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.",
optnote="WOS:000718113500001",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5024), last updated on Tue, 23 Nov 2021 09:46:12 +0000",
issn="1434-6044",
doi="10.1140/epjc/s10052-021-09661-0",
opturl="https://arxiv.org/abs/1509.02194",
opturl="https://doi.org/10.1140/epjc/s10052-021-09661-0",
language="English"
}