Bounding elastic photon-photon scattering at √s ≈ 1 MeV using a laser-plasma platform

Watt, R.; Pérez-Callejo, G.; Astbury, S.; Underwood, C.; Murphy, C. D.; Zepf, M.; Roeder, F.; Rajeev, P. P.; Spindloe, C.; Alejo, A.; Hatfield, P.; Gerstmayr, E.; Wu, W.; Dannheim, D.; King, B.; Morton, J.; Gregory, C.; Streeter, M. J. V.; Samarin, G. M.; Sarri, G.; Steinke, S.; Thomas, A. G. R.; Colgan, C.; Roedel, C.; Rose, S. J.; Harsh, H.; Baird, C.; Katzir, Y.; Hollatz, D.; Osterhoff, J.; Mangles, S. P. D.; Kettle, B.; Seidel, A.; Salgado, F. C.; Campbell, M.; Nurnberg, A.; Põder, K.; Bohlen, S.; Hinojosa, J.

doi:10.1016/j.physletb.2025.139247

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Marc 21

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088	_	_	\|a arXiv:2407.12915 \|2 arXiv
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100	1	_	\|a Watt, R. \|b 0
245	_	_	\|a Bounding elastic photon-photon scattering at √s ≈ 1 MeV using a laser-plasma platform
260	_	_	\|a Amsterdam \|c 2025 \|b North-Holland Publ.
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520	_	_	\|a 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.
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700	1	_	\|a Kettle, B. \|b 1
700	1	_	\|a Gerstmayr, E. \|b 2
700	1	_	\|a King, B. \|0 P:(DE-H253)PIP1100286 \|b 3 \|e Corresponding author
700	1	_	\|a Alejo, A. \|b 4
700	1	_	\|a Astbury, S. \|b 5
700	1	_	\|a Baird, C. \|b 6
700	1	_	\|a Bohlen, S. \|0 P:(DE-H253)PIP1019641 \|b 7
700	1	_	\|a Campbell, M. \|b 8
700	1	_	\|a Colgan, C. \|b 9
700	1	_	\|a Dannheim, D. \|b 10
700	1	_	\|a Gregory, C. \|b 11
700	1	_	\|a Harsh, H. \|b 12
700	1	_	\|a Hatfield, P. \|b 13
700	1	_	\|a Hinojosa, J. \|b 14
700	1	_	\|a Hollatz, D. \|b 15
700	1	_	\|a Katzir, Y. \|b 16
700	1	_	\|a Morton, J. \|b 17
700	1	_	\|a Murphy, C. D. \|b 18
700	1	_	\|a Nurnberg, A. \|b 19
700	1	_	\|a Osterhoff, J. \|b 20
700	1	_	\|a Pérez-Callejo, G. \|b 21
700	1	_	\|a Põder, K. \|b 22
700	1	_	\|a Rajeev, P. P. \|b 23
700	1	_	\|a Roedel, C. \|b 24
700	1	_	\|a Roeder, F. \|b 25
700	1	_	\|a Salgado, F. C. \|b 26
700	1	_	\|a Samarin, G. M. \|b 27
700	1	_	\|a Sarri, G. \|b 28
700	1	_	\|a Seidel, A. \|b 29
700	1	_	\|a Spindloe, C. \|b 30
700	1	_	\|a Steinke, S. \|b 31
700	1	_	\|a Streeter, M. J. V. \|b 32
700	1	_	\|a Thomas, A. G. R. \|b 33
700	1	_	\|a Underwood, C. \|b 34
700	1	_	\|a Wu, W. \|b 35
700	1	_	\|a Zepf, M. \|b 36
700	1	_	\|a Rose, S. J. \|b 37
700	1	_	\|a Mangles, S. P. D. \|b 38
773	_	_	\|a 10.1016/j.physletb.2025.139247 \|g Vol. 861, p. 139247 - \|0 PERI:(DE-600)1466612-1 \|p 139247 \|t Physics letters / B \|v 861 \|y 2025 \|x 0031-9163
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Marc 21

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