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

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-02-01 DOI:10.1016/j.physletb.2025.139247

R. Watt , B. Kettle , E. Gerstmayr , B. King , A. Alejo , S. Astbury , C. Baird , S. Bohlen , M. Campbell , C. Colgan , D. Dannheim , C. Gregory , H. Harsh , P. Hatfield , J. Hinojosa , D. Hollatz , Y. Katzir , J. Morton , C.D. Murphy , A. Nurnberg , S.P.D. Mangles

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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 wakefield accelerator provided a broadband γ spectrum extending to above

. These were collided with a dense x-ray field produced by the emission from a laser heated germanium foil at

, corresponding to an invariant mass of

. 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

. Although far from the QED prediction, this represents the lowest upper limit obtained so far for

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.