The next step in the development of the FCC project is the Reference Design Phase and the assembly of the required materials, in preparation for a CERN Council decision on the future HEP machine, foreseen in 2028. Thus, there is a new organization of the FCC groups

Janusz Gluza and Marco Zaro are conveners of the new Precision calculation subgroup. The mandate of the group covers various aspects of precision physics, including:

• Multi-loop computations (techniques and applications) within the SM or its extensions (e.g SMEFT)
• Modelling of Initial- and Final- State Radiation, and interference (electron structure function, parton shower, EWPOs…)
• Impact of different kinds of resummations (collinear, soft, …) on different processes
• Delivering predictions for the key FCC-ee processes (EWPOs at the Z pole, Zh, WW, ttbar)
• Providing estimates of theoretical uncertainties on physics predictions 

The activities of our subgroup are closely connected with those of other groups (MC generators, EW, Higgs, …), with which we envisage joint activities, such as (mini-) workshops, schools, etc.

For a full list of working groups, see https://gms.web.cern.ch/, where you can join our group (fcc-ped-physicsgroup-precisioncalculations). Here, you are directed to the group of your interest: https://indico.cern.ch/event/1663323/contributions/7010789/attachments/3256388/5812739/PED_egroups_chart_2026_03_21.pdf

In the Precision Calculation subgroup, we plan to organise talks and discussions on these subjects, with particular focus on new works and/or on topics in response to interests and needs raised by the community. Please follow the links to the events and talks here: https://indico.cern.ch/category/21380/