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@ARTICLE{Dai:826211,
      author       = {Dai, Lingyun and Pennington, M. R.},
      title        = {{P}ion polarizabilities from a γ γ → π π analysis},
      journal      = {Physical review / D},
      volume       = {94},
      number       = {11},
      issn         = {2470-0010},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-00457},
      pages        = {116021},
      year         = {2016},
      abstract     = {We present results for pion polarizabilities predicted
                      using dispersion relations from our earlier amplitude
                      analysis of world data on two photon production of meson
                      pairs. The helicity-zero polarizabilities are rather stable
                      and insensitive to uncertainties in cross-channel exchanges.
                      The need is first to confirm the recent result on
                      (α1−β1) for the charged pion by COMPASS at CERN to an
                      accuracy of $10\%$ by measuring the γγ→π+π− cross
                      section to an uncertainty of $1\%.$ Then the same
                      polarizability, but for π0, is fixed to be
                      (α1−β1)π0=(0.9±0.2)×10−4  fm3. By analyzing the
                      correlation between uncertainties in the meson
                      polarizability and those in γγ cross sections, we suggest
                      experiments need to measure these cross sections between
                      √s≃350 and 600 MeV. The π0π0 cross section then makes
                      the (α2−β2)π0 the easiest helicity-two polarizability
                      to determine.},
      cin          = {IAS-4 / IKP-3},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
      pnm          = {511 - Computational Science and Mathematical Methods
                      (POF3-511) / 531 - Condensed Matter and Molecular Building
                      Blocks (POF3-531)},
      pid          = {G:(DE-HGF)POF3-511 / G:(DE-HGF)POF3-531},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000391016800012},
      doi          = {10.1103/PhysRevD.94.116021},
      url          = {https://juser.fz-juelich.de/record/826211},
}