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A signal of 10614 positrons above background has been observed in collisions of a low-emittance 46. 6 GeV electron beam with terawatt pulses from a Nd: glass laser at 527 nm wavelength in an experiment at the Final Focus Test Beam at SLAC. The positrons are interpreted as arising from a two-step process in which laser photons are backscattered to GeV energies by the electron beam followed by a collision between the high-energy photon and several laser photons to produce an electron-positron pair. These results are the first laboratory evidence for inelastic light-by-light scattering involving only real photons.
Burke et al. (Mon,) studied this question.
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