Physical problems for future Photon Colliders

TL;DR

This paper discusses the potential physical challenges and research opportunities for future Photon Colliders, especially in the context of studying Higgs bosons, gauge boson production, and exotic interactions at multi-TeV energies.

Contribution

It explores the physics problems and experimental prospects for high-energy Photon Colliders based on the second stage of ILC or CLIC, focusing on new fundamental physics investigations.

Findings

Potential to study multiple gauge boson production

Search for strong interactions in the Higgs sector

Investigation of exotic photon interactions

Abstract

In this report I discuss physical problems for future Photon Colliders (PLC), which can be stated AFTER 10 years of work of LHC and few years of work of e^+e^- ILC. I discuss mainly the unfavorable case when these colliders will give us only Higgs boson(s) and perhaps some charged particles of unclear nature. I focus my attention for the case of PLC based on the second stage of ILC (about 1 TeV) or CLIC (1-3 TeV). It offers opportunity to study new series of fundamental physical problems. Among them - multiple production of gauge bosons, hunt for strong interaction in Higgs sector, search of exotic interactions in the process $\gamma\gamma\to\gamma\gamma$ with final photons having transverse momenta (0.5 - 0.7)E_e.