Details about Snowmass 2021 can be found on the official page:

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 (

Snowmass_2021_LOI-Belle II+SuperKEKB_Upgrades+Overview_v2.pdf

Almost final draft, needs topical group code for Computation Frontier which was missing from the Comp Frontier LOI: B2_LOI_AlanSchwartzTemplate-Upgrades.pdf

2. Belle II/SuperKEKB capabilities for B physics

Coordinator: Soeren Prell (

Draft 1.0

Draft 2.0 (textual changes)

Draft 3.0 (final) - changed cover page to common format, edits addressing comments from Alan, Kevin, and Tom

3. Belle II/SuperKEKB capabilities for the dark sector

Coordinators: Chris Hearty (, Kevin Flood (

Draft V2 

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 

B2_LOI_AlanSchwartzTemplate-DarkSector-Final.pdf: uses Alan's Charm LOI as a title page template; has final author list; edits suggested by final reader (Soeren)

4. Belle II/SuperKEKB capabilities for charm physics

Coordinator: Alan Schwartz (

Draft v1

Draft v2 (added text in red)

Draft v3 (added text in red)

Draft v4 (added text in blue)

Draft v4 (no colors)

Draft v5 (final) (LaTex) (author-usbelle2.tex)

5. Belle II/SuperKEKB capabilities for tau and electroweak physics

Coordinator: Swagato Banerjee (

Evolving Overleaf draft (view-only link)

6. Belle II/SuperKEKB capabilities for hadron spectroscopy

Coordinator: Bryan Fulsom (

Evolving Overleaf draft (view-only link)

7. Belle II/SuperKEKB capabilities for QCD

Coordinator: Anselm Vossen (

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_LOI_v2.pdf (text edits, cleaned up VXD part of summary table)

Draft 3.0: Belle2_Snowmass_Instrumentation_LOI_v3.pdf(added author list, fixed 2032 luminosity, other minor corrections)

Evolving Overleaf draft (view-only link)

9. Belle II plans for the computing frontier

Coordinator: Jake Bennett (

Evolving overleaf draft (view-only link)