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@ARTICLE{Watt:622591,
      author       = {Watt, R. and Kettle, B. and Gerstmayr, E. and King, B. and
                      Alejo, A. and Astbury, S. and Baird, C. and Bohlen, S. and
                      Campbell, M. and Colgan, C. and Dannheim, D. and Gregory, C.
                      and Harsh, H. and Hatfield, P. and Hinojosa, J. and Hollatz,
                      D. and Katzir, Y. and Morton, J. and Murphy, C. D. and
                      Nurnberg, A. and Osterhoff, J. and Pérez-Callejo, G. and
                      Põder, K. and Rajeev, P. P. and Roedel, C. and Roeder, F.
                      and Salgado, F. C. and Samarin, G. M. and Sarri, G. and
                      Seidel, A. and Spindloe, C. and Steinke, S. and Streeter, M.
                      J. V. and Thomas, A. G. R. and Underwood, C. and Wu, W. and
                      Zepf, M. and Rose, S. J. and Mangles, S. P. D.},
      title        = {{B}ounding elastic photon-photon scattering at
                      $\sqrt{s}≈$ 1 {M}e{V} using a laser-plasma platform},
      reportid     = {PUBDB-2025-00404, arXiv:2407.12915},
      year         = {2025},
      note         = {6 pages, 10 figures},
      abstract     = {We report on a direct search for elastic photon-photon
                      scattering using x-ray and 𝛾 photons from a laser-plasma
                      based experiment. A 𝛾 photon beam produced by a laser
                      wakfield accelerator provided a broadband 𝛾 spectrum
                      extending to above 𝐸𝛾 = 200 MeV. These were collided
                      with a dense x-ray field produced by the emission from a
                      laser heated germanium foil at 𝐸𝑥 ≈ 1.4 keV,
                      corresponding to an invariant mass of √𝑠 = 1.22 ± 0.22
                      MeV. In these asymmetric collisions elastic scattering
                      removes one x-ray and one high-energy 𝛾 photon and
                      outputs two lower energy 𝛾 photons. No changes in the
                      𝛾 photon spectrum were observed as a result of the
                      collisions allowing us to place a $95\%$ upper bound on the
                      cross section of 1.5 × 1015 μb. Although far from the QED
                      prediction, this represents the lowest upper limit obtained
                      so far for √𝑠 ≲ 1 MeV.},
      cin          = {D3 / MPA},
      ddc          = {530},
      cid          = {I:(DE-H253)D3-20120731 / I:(DE-H253)MPA-20200816},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      TeX-MEx - Time resolved X-ray probing of Matter under
                      Extreme conditions (682399)},
      pid          = {G:(DE-HGF)POF4-621 / G:(EU-Grant)682399},
      experiment   = {EXP:(DE-H253)FLASHForward-20150101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2407.12915},
      howpublished = {arXiv:2407.12915},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2407.12915;\%\%$},
      url          = {https://bib-pubdb1.desy.de/record/622591},
}