Abstract
We consider the kinematics of γγ scattering - a process which is accessible to experimental study [1,2]. Two sets of invariant amplitudes are given. One of them corresponds to the s-channel helicity amplitudes (cross section for the scalar and transversal photons). The second one is a combination of t-channel helicity amplitudes with the high-energy asymptotic behavior as low as possible. Asymptotic behaviour for each amplitude is given in the simple Regge-pole model. The possibility for fixed singularities to appear in the imaginary part of the amplitude is pointed out.
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