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                                 Abstract:Contributions of fermion loops,W-boson loops and their sum to the high energyγγ→γγ scattering total cross section (|cosθ|<COS30)are calculated numerically by using the analytic expressions ofγγ→γγ scattering helicity amplitude from previous paper.These contributions may be observed in the future Photon Linear Collider,and may be used to test standard model.
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