Effective photon spectra for Photon Colliders

TL;DR

This paper derives simple approximate formulas for photon spectra in photon colliders, accurately describing the high-energy luminosity peak crucial for studying new physics, and highlights the limitations of the low-energy peak for such research.

Contribution

It introduces a simple approximation for photon spectra in gamma-gamma and electron-gamma colliders that accurately models the high-energy peak.

Findings

Approximate formulas match detailed spectra in the high-energy region.

Low energy peak is highly sensitive to collider design details.

The formulas facilitate better analysis of collider data for new physics searches.

Abstract

The luminosity distribution in the effective $\gamma\gamma$ 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 $\gamma\gamma$ and $e\gamma$ colliders wich convolution describes high energy luminosity peak with good accuracy in the most essential preferable region of parameters.