Co-Conveners : Marc Ross (SLAC), Qing Qin (IHEP, Beijing), Georg Hoffstaetter (Cornell)

Electro-weak physics and the Higgs are currently of major interest to the HEP community and will likely persist into the foreseeable future. Technology for linear and circular e+e- machines are fairly mature. This Group will focus on the remaining technical issues and explore possible cost reduction schemes. Some of the proposed topics are:

1. Question/Topic1 Identification and mitigation of cost drivers
2. Question/Topic 2 Room temperature and superconducting RF
3. Question/Topic 3 Positron sources
4. Question/Topic 4 IR magnets
5. Question/Topic 5 Additional topics related to cost reduction and performance improvement
6. Question/Topic 6 Alternative approaches in the context of EW/Higgs studies such as muon colliders, gamma-gamma, ?

Many relevant publications can be found at: https://www.nature.com/collections/cajfiddcee , https://www.nature.com/collections/heigibehfc, https://arxiv.org/abs/1910.11775

Also see D. Schulte's summary Granada ESUPP (2019) presentation: https://indico.cern.ch/event/808335/contributions/3365234/attachments/1842874/3023173/ESU_higgs_final.pdf

AF3 Milestones:

1. Solicit Letters of Intent (LoI) to contribute to the Snowmass process
2. Engage partners in other Frontiers, especially Energy Frontier to co-author LoI focused on showing how proposed facilities can do the physics.
3. Prepare contributions to the 4-6 November 2020 Snowmass Planning Meeting, covering both updates to mature designs and potential of new ideas.

Here is the list of submitted LOIs to this topic. First index before “/” corresponds to the primary frontier used for the submission.