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@ARTICLE{Holz:902432,
      author       = {Holz, S. and Plenter, J. and Xiao, C. W. and Dato, T. and
                      Hanhart, Christoph and Kubis, B. and Meißner, U.-G. and
                      Wirzba, A.},
      title        = {{T}owards an improved understanding of ${\eta \rightarrow
                      \gamma ^*\gamma ^*}$},
      journal      = {The European physical journal / C},
      volume       = {81},
      number       = {11},
      issn         = {1434-6044},
      address      = {Heidelberg},
      publisher    = {Springer},
      reportid     = {FZJ-2021-04254},
      pages        = {1002},
      year         = {2021},
      abstract     = {We argue that high-quality data on the reaction
                      e+e−→π+π−η will allow one to determine the
                      doubly-virtual form factor η→γ∗γ∗ 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 the muon. When analyzing the existing
                      data for e+e−→π+π−η for total energies squared
                      k2>1GeV2, we demonstrate that the effect of the a2 meson
                      provides a natural breaking mechanism for the commonly
                      employed factorization ansatz in the doubly-virtual form
                      factor Fηγ∗γ∗(q2,k2). However, better data are needed
                      to draw firm conclusions.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {5111 - Domain-Specific Simulation Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511) / DFG project
                      196253076 - TRR 110: Symmetrien und Strukturbildung in der
                      Quantenchromodynamik (196253076)},
      pid          = {G:(DE-HGF)POF4-5111 / G:(GEPRIS)196253076},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000718113500001},
      doi          = {10.1140/epjc/s10052-021-09661-0},
      url          = {https://juser.fz-juelich.de/record/902432},
}