Comments on photon colliders for Snowmass 2013

TL;DR

This paper critically reviews photon collider concepts, especially Higgs factories without e+e- collisions, discussing their feasibility and recent proposals in the context of linear collider projects like ILC and CLIC.

Contribution

It provides a critical overview of recent photon collider proposals for Higgs factories without e+e- collisions, highlighting their potential and challenges.

Findings

Photon colliders are considered a natural addition to linear collider projects.

Recent proposals focus on Higgs factories without e+e- collision options.

The paper discusses the feasibility and physics potential of these photon collider concepts.

Abstract

For more than 30 years [1], gamma-gamma and gamma-electron photon colliders have been considered a natural addition to e+e- linear-collider projects. Following the recent discovery of the Higgs boson, the physics community has been actively considering various approaches to building a Higgs factory, a photon collider (with or without e+e-) being one of them. In this note, following a brief discuss of photon colliders based on ILC and CLIC, I give a critical overview of the recently proposed photon-collider Higgs factories with no e+e- collision option.