Effective photon spectra for Photon Colliders

The luminosity distribution in the effective $γγ$ mass at photon collider has usually two peaks which are well separated: high energy peak with mean energy spread 5-7% and wide low energy peak.The low energy peak depends strongly on details of design it is unsuitablefor the study of New Physics phenomena. We find simple approximte form of spectra of collided photons for $γγ$ and $eγ$ colliders wich convolution describes high energy luminosity peak with good accuracy in the most essential preferable region of parameters.

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