Abstract
Contributions of fermion loops, W-boson loops and their sum to the high energy γγ → γγ scattering total cross sections (|cosθ| < cos30°) are calculated by analytical expressions of γγ → γγ scattering amplitude. These contributions may be observed in the future photon linear collider and may be used to test standard model. The contribution of fermions' loops is a half of that in R.K. Arphlus and M. Neuuman's paper (Phys. Rev. 80 (1950) 380; 83 (1951) 776).
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