ROOT Team Meeting

Monday 29 Sept 2025, 16:00 → 17:30 Europe/Zurich

32/1-A24 (CERN)

Danilo Piparo (CERN), Jakob Blomer (CERN)

2026 PoW Snapshot

PoW Status

Status Report Document

Vision for ROOT7

2025-09-29

News

• Poster template linked from the status report document
  • Lukas removed the borders (as discussed)
• PoW completion status: how should we count extra items?
  • Right now they reduce the overall percentage instead of replacing an item
• Abstract submissions for CHEP 2026 will open soon (link in the document)
• See status report document for list of important dates

Shift Handover

• See Silia's status report

Meeting Summaries

• JSROOT + CERNbox
  • Plan to change interface, better performance for large files
• Statistical Analysis Software, meeting this week
• PPP: presentation and discussion about histv7
• Planning: Q3 report on Wednesday

Liasons' Report

• ATLAS:
  • SPOT meeting after this slot, QT report on zstd with RNTuple
• ALICE:
  • Bug fixed for LLVM symbols not hidden; backports for v6.36 and v6.32
  • Problems with enums - or already solved? Guilio is rechecking the latest ROOT version
• CMS:
  • Common Analysis Tools hackathon: Stephan presented about (varied) snapshots - well received
  • CAT workshop end of November
  • This week: CMS week, Vincenzo will attend session on computing quotas
• LHCb:
  • Nursena's work was featured last week

Round Table

see status report document

• Philippe: fixed memory error on read of maps with TTree::Draw
• Serguey: discussion about JSROOT features
• Vassil: debugging issues with Clad master in ROOT

16:00 → 16:01 Find notetaker

16:01 → 16:05 News

16:05 → 16:10 Shift Handover

Silia --> Olivier

16:10 → 16:15 Meeting Summaries and Plans

ROOT Meetings:
- PoW Jamboree
- JSROOT & CERNBox
- I/O
- Statistical Analysis Software
- PPP
- Planning / Stakeholders

Related meetings:
- ML4EP
- LIM

16:15 → 16:45 Topics

• Liaisons' Reports

16:45 → 17:00 Round table

17:00 → 17:05 A.O.B.