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Update on the Snowmass 2021 – Community Planning Meeting

During the week of October 4-8, the “Community Planning Meeting” (CPM2020) for the Snowmass 2021 took place. The aim was to developed the plans and the steps to take until the Community Summer Study (CSS) in July 2021. During the CSS a consensus on the key questions and opportunities of particle physics, enabling technologies and community engagement should be built and the content of the Snowmass Executive Summary should be formulated. The Snowmass21 process is leading to the final report, expected in October 2021. More information on the whole process is available here and from the Snowmass21 website.

The CPM2020 was held virtually, with over 3000 participants from the whole world. The overall program, presentations and recordings are available at

A presentation on the European strategies for particle physics (2020), nuclear physics (2017), and astroparticle physics (2017), was delivered by Jorgen D’Hondt and was very well received. The Frontier-level workshops, including those of interest for APPEC (i.e. Theory, Neutrino, Cosmic, Instrumentation, Computational, Underground Facility and Infrastructure), have been organized since April 2020 and will continue through spring 2021.  During CPM2020 the Frontiers received more than 1500 Letters of Interest which led to the organization of an impressive amount of parallel sessions during the second and third day on various topics of interest for APPEC, ranging from theoretical Dark Matter interpretations, and analysis/theory techniques for joint cosmological constraints, to future gravitational wave facilities. 

The 10 frontiers and 80 topical groups will now develop the key questions and opportunities with the community members and converge on a series of white papers which will be used as inputs for the final report. An overview about the CMP2020 and the next steps for all frontiers is available in the October issue of Snowmass21 newsletter. The next milestone will be the Snowmass Mid-term Assessment during the 2021 APS April meeting.

Berrie Giebels, International Adviser representing APPEC