Large Coulomb corrections in high-energy photon splitting
R. N. Lee, A. I. Milstein, V. M. Strakhovenko
Abstract
The Coulomb corrections to the helicity amplitudes of high-energy photon splitting are examined. The consideration is based on the amplitudes obtained exactly in the parameter Zαwithin the quasiclassical approach valid for small angles between all photon momenta. We consider the case when the transverse momenta of both final photons are much larger than the electron mass. It is shown that at Zα 1 the Coulomb corrections essentially change the result for the cross section as compared to the Born approximation. The effect of screening is also taken into account.
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