Two-photon physics at future electron-positron colliders

TL;DR

This paper explores the potential of future electron-positron colliders, like CEPC, for two-photon physics, including Higgs production, quarkonium studies, and precision measurements of photon structure and tau magnetic moments.

Contribution

It provides a detailed analysis of the physics opportunities at future colliders for two-photon processes, highlighting the expected improvements over current results.

Findings

Higgs boson photoproduction can be reliably observed with planned luminosity.

Large statistics of quarkonium states can be collected.

Photon structure function and tau magnetic moment measurements can improve significantly.

Abstract

Two photon collisions offer a variety of physics studies that can be performed at the future electron-positron colliders. Using the planned CEPC parameters as a benchmark we consider several topics to be studied in the two-photon collisions. With the full integrated luminosity the Higgs boson photoproduction can be reliably observed. A large statistics of various quarkonium states can be collected. The LEP results on the photon structure function and the tau lepton anomalous magnetic moment can be improved by 1-2 orders of magnitude.