Positron Production by Laser Light
نویسنده
چکیده
A signal of positrons above background has been observed in collisions of a low emittance GeV electron beam with terawatt pulses from a Nd glass laser at nm wavelengths 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 backscat tered to GeV energies by the electron beam followed by a collision be tween the high energy photon and several laser photons to produce an electron positron pair These results are the rst laboratory evidence for inelastic light by light scattering involving only real photons Supported by DOE Grant DE FG ER See Acknowledgments z c by Kirk T McDonald
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