| Sumario: | We study the effect of the spin in the scattering of ultra-high energetic particles. We find the ultrarelativistic limit of the boosted Kerr-Newman geometry. This represents the gravitational shock wave of a particle travelling at the speed of light with quantum numbers given by kinetic (p), electromagnetic and color (pb) and spin (a) momenta [mass, charges and spin vanish as m-γ-1p, b=γ- 1 2pband s=apγ-1(γ-1= 1-v2)]. We find the exact S-matrix describing the scattering of a neutral masive field with this shock wave geometry. Finally, we discuss briefly the relation of this process with that of the scattering of strings. © 1989.
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