ECFA Higgs, electroweak, and top Factory Study

TL;DR

The ECFA study comprehensively evaluated the physics potential of future electron-positron colliders for Higgs, electroweak, and top physics, leading to improved sensitivity projections and informing strategic planning.

Contribution

It provides a detailed assessment of future collider capabilities, integrating experimental and theoretical insights to enhance understanding of fundamental particles and interactions.

Findings

Expanded understanding of physics potential of future colliders

Improved projected sensitivities for key measurements

Development of new analysis tools and detector optimization strategies

Abstract

The ECFA Higgs, electroweak, and top Factory Study ran between 2021 and 2025 as a broad effort across the experimental and theoretical particle physics communities, bringing together participants from many different proposed future collider projects. Activities across three main working groups advanced the joint development of tools and analysis techniques, fostered new considerations of detector design and optimisation, and led to a new set of studies resulting in improved projected sensitivities across a wide physics programme. This report demonstrates the significant expansion in the state-of-the-art understanding of the physics potential of future e+e- Higgs, electroweak, and top factories, and has been submitted as input to the 2025 European Strategy for Particle Physics Update.