Bounding elastic photon-photon scattering at $\sqrt{s}\approx 1$MeV using a laser-plasma platform

R. Watt, B. Kettle, E. Gerstmayr +36

We report on a direct search for elastic photon-photon scattering using x-ray and ${\hat{I}}^3$ photons from a laser-plasma based experiment. A gamma photon beam produced by a laser wakefie…