TL;DR
This paper reviews the physics potential of future electron-positron colliders like ILC, FCC-ee, and CEPC, focusing on electroweak precision tests and Higgs measurements to explore new physics scenarios.
Contribution
It provides a comparative analysis of collider options and includes new electroweak precision results for FCC-ee and CEPC.
Findings
Electroweak precision tests can constrain new physics models.
Higgs coupling measurements can reveal deviations indicating new physics.
Future colliders offer complementary capabilities for high-precision measurements.
Abstract
I give an overview of the physics potential at possible future colliders, including the ILC, FCC-ee, and CEPC. The goal is to explain some of the measurements that can be done in the context of electroweak precision tests and Higgs couplings, to compare some of the options under consideration, and to put the measurements in context by summarizing their implications for some new physics scenarios. This is a writeup of a plenary talk at the Hong Kong University of Science and Technology Jockey Club Institute for Advanced Study Program on High Energy Physics Conference, January 18--21, 2016. Some previously unpublished electroweak precision results for FCC-ee and CEPC are included.
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