Details about Snowmass 2021 can be found on the official page: https://snowmass21.org/
The European Strategy Group (ESG) process has nearly completed. The next major decadal strategy effort is the US Snowmass process, which will be followed by P5 panel recommendations, which in turn will guide funding and resource decisions.
The first issue for the US Snowmass process is the submission of short 2-page LOI's by Aug 30th and longer documents before summer of next year (2021). Detailed scientific discussions will take place during the next year and a large close-out meeting is planned in Seattle, WA in the summer of 2021.
The following draft LOIs have been prepared for Belle II:
1. Belle II/SuperKEKB upgrades and overview
Coordinator: Tom Browder (teb@phys.hawaii.edu)
Snowmass_2021_LOI-Belle II+SuperKEKB_Upgrades+Overview_v2.pdf
2. Belle II/SuperKEKB capabilities for B physics
Coordinator: Soeren Prell (prell@iastate.edu)
Draft 2.0 (textual changes)
3. Belle II/SuperKEKB capabilities for the dark sector
Coordinators: Chris Hearty (hearty@physics.ubc.ca), Kevin Flood (kflood@hawaii.edu)
Draft V3: add dark photon search to pi+ pi- final state
Draft V4: add paragraph on long-lived particles
Draft V5: add paragraph on sterile neutrinos in tau decay
4. Belle II/SuperKEKB capabilities for charm physics
Coordinator: Alan Schwartz (alan.j.schwartz@uc.edu)
Draft v2 (added text in red)
Draft v3 (added text in red)
Draft v4 (added text in blue)
Draft v4 (no colors)
5. Belle II/SuperKEKB capabilities for tau and electroweak physics
Coordinator: Swagato Banerjee (swagato.banerjee@louisville.edu)
Evolving Overleaf draft (view-only link)
6. Belle II/SuperKEKB capabilities for hadron spectroscopy
Coordinator: Bryan Fulsom (bryan.fulsom@pnnl.gov)
Evolving Overleaf draft (view-only link)
7. Belle II/SuperKEKB capabilities for QCD
Coordinator: Anselm Vossen (anselm.vossen@duke.edu)
Evolving Overleaf draft (view-only link)
8. Belle II detector upgrades (plans for the instrumentation frontier)
Coordinator: Sven Vahsen ( Sven Einar Vahsen)
Draft 1.0: Belle2_Snowmass_Instrumentation_LOI_v1.pdf
Draft 2.0: Belle2_Snowmass_Instrumentation_v2.pdf (text edits, cleaned up VXD, PXD in table)
Draft 3.0: Belle2_Snowmass_Instrumentation_LOI_v3.pdf(added author list, fixed 2026 luminosity, other minor corrections)
Evolving Overleaf draft (view-only link)
9. Belle II plans for the computing frontier
Coordinator: Jake Bennett (jvbennet@olemiss.edu)
Evolving overleaf draft (view-only link)