Abstract

The luminosity distribution in the effective $\gamma\gamma$ mass at a photon collider usually has two peaks which are well separated: a high energy peak with mean energy spread about 5–7% and a wide low energy peak. The low energy peak strongly depends on the details of the design and is unsuitable for the study of new physics phenomena. We find a simple approximate form for the spectra of colliding photons for $\gamma \gamma$ and $e\gamma $ colliders, whose convolution describes the high energy luminosity peak with a good accuracy in most of the essential preferable region of the parameters.

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