Login

ROOT Users Workshop 2025

17โ€“21 Nov 2025
Europe/Madrid timezone

Session

Morning Session II

17 Nov 2025, 11:00

Presentation materials

There are no materials yet.

  1. 4. ALICE
    Sandro Christian Wenzel (CERN)
    17/11/2025, 11:00
  2. 5. ATLAS
    Gordon Watts (University of Washington (US)), Vincenzo Innocente (Fermi National Accelerator Lab. (US))
    17/11/2025, 11:30
  3. 6. CMS
    Philippe Canal (Fermi National Accelerator Lab. (US))
    17/11/2025, 12:00
  4. 90. ROOT in the LHCb Software Framework - past, present and future
    Marco Clemencic (CERN)
    17/11/2025, 12:30

    The LHCb Collaboration has been using ROOT in its software framework from the beginning, in more or less efficient way. Here summarize the evolution of our use of ROOT to then glimpse into the possible paths in view of LHC Run4 and LHCb Upgrade 2.

    Go to contribution page
  5. 17. Overview of the current RDataFrame efforts
    Marta Czurylo (CERN), Stephan Hageboeck (CERN), Dr Vincenzo Eduardo Padulano (CERN)
    18/11/2025, 11:00
  6. 92. Benchmarking ROOT-Based Analysis Workflows for HL-LHC: The CMS INFN AF Use Case
    Luca Pacioselli (INFN, Perugia (IT))
    18/11/2025, 11:20

    For a few years, INFN has been developing R&D projects in the context of CMS high-rate analyses in view of the challenges of the HL-LHC phase, starting in 2030. Since then, several studies have been implemented and as a result a prototype for an analysis facility has been proposed, in compliance with CMS analysis frameworks (e.g. based on Coffea, ROOT RDataFrame), and also adopting open-source...

    Go to contribution page
  7. 19. Discussion
    18/11/2025, 11:40
  8. 75. Vibe Plotting: ServiceX, RDataFrame, and a LLM
    Gordon Watts (University of Washington (US))
    18/11/2025, 12:00

    Can we teach an LLM to plot experimental HEP data? Modern particle physics workflows increasingly depend on a complex software ecosystem that connects large datasets, distributed data delivery, and user-level analysis tools. We demonstrate how a Large Language Model (LLM) can act as a coding assistant that bridges these components. Starting from a high-level user requestโ€”such as โ€œplot jet...

    Go to contribution page
  9. 82. NDMSPC: Addressing THnSparse Challenges in High-Dimensional Analysis
    Martin Vala (Pavol Jozef Safarik University (SK))
    18/11/2025, 12:20

    The NDMSPC project introduces an innovative THnSparse analysis framework for high-dimensional data, directly addressing the challenge of fitting N-dimensional histograms within memory. Our solution organizes the THnSparse structure into sub-chunks, optimizing memory efficiency and enabling scalable processing. Beyond numerical values, the framework allows bin content to be arbitrary objects,...

    Go to contribution page
  10. 22. Discussion
    18/11/2025, 12:40
  11. 143. LHCb Data Analysis Towards Run 5: Challenges and Needs for ROOT
    Jiahui Zhuo (Univ. of Valencia and CSIC (ES))
    19/11/2025, 11:00

    LHCbโ€™s data analysis model is evolving rapidly in preparation for Run 5 and the HL-LHC era. This talk will outline how LHCb analysts perform end-to-end analyses, from data production to final physics results, and how these workflows differ from those of the general-purpose detectors. We will discuss the increasing demands on scalability, interoperability, and usability of analysis tools,...

    Go to contribution page
  12. 91. Usage of EDM4hep datamodel in RDataFrame
    Juraj Smiesko (CERN)
    19/11/2025, 11:20

    The Future Circular Collider analysis framework, FCCAnalyses, heavily relies on the Key4hep provided datamodel: EDM4hep. The datamodel itself is described by a simple YAML file, and all required I/O classes are generated with the help of Podio, datamodel generator and I/O layer. One of the limitations of the Podio-based datamodel is that its internal structure, while providing convenient...

    Go to contribution page
  13. 31. Discussion
    19/11/2025, 11:40
  14. 79. CMS FlashSim and ROOT RDataFrame for ML-Based Event Simulation
    Filippo Cattafesta (Scuola Normale Superiore & INFN Pisa (IT))
    19/11/2025, 12:00

    CMS is developing FlashSim, a machine learningโ€“based framework that produces analysis-level (NANOAOD) events directly from generator-level inputs, reducing simulation costs by orders of magnitude. Efficient integration of preprocessing, inference, and output is essential, and ROOT RDataFrame provides the backbone of this workflow.

    Certain operations required for FlashSim are not yet part of...

    Go to contribution page
  15. 97. Analyzing HL-LHC heavy-ion collision data with ALICE
    Victor Gonzalez (Wayne State University (US))
    19/11/2025, 12:20

    Analyzing HL-LHC heavy-ion collision data with ALICE

    Victor Gonzalez, Wayne State University (US),
    on behalf of the ALICE Collaboration

    The ALICE detector has been taking data at heavy-ion HL-LHC regime since the start of the LHC Run 3 Pb--Pb campaign in October 2023. Recording Pb$-$Pb collisions at 50 kHz and pp collisions up to 1 MHz interaction rates without trigger results in...

    Go to contribution page
  16. 34. Discussion
    19/11/2025, 12:40
  17. 117. RNTuple advanced topics
    Giacomo Parolini (CERN)
    20/11/2025, 11:00
  18. 118. Future of ROOT I/O
    Florine Willemijn de Geus (CERN/University of Twente (NL))
    20/11/2025, 11:20
  19. 43. Discussion
    20/11/2025, 11:40
  20. 71. TDAnalyser - a modular framework for the analysis of test beam data
    Laurent Forthomme (AGH University of Krakow (PL))
    20/11/2025, 12:00

    We present a new, modular framework for the processing of test beam data, and in particular for the R&D programme of future timing detectors.

    Based on a C++ architecture, it aims to normalise workflows for the analysis of detector performances through the definition of standard and user-defined analyses (e.g. time discrimination algorithms, intrinsic time resolution, or inter-channel...

    Go to contribution page
  21. 149. The ROOT 7 Release Series
    Stephan Hageboeck (CERN)
    20/11/2025, 12:20
  22. 46. Discussion
    20/11/2025, 12:40
  23. 100. JSRoot in Web Applications for High-Energy Physics: From Interactive Visualizations to Particle Transport Simulations
    Leszek Grzanka (AGH University of Krakow (PL))
    21/11/2025, 11:00

    This contribution highlights practical uses of ROOT and JSROOT for data exploration and web-based visualization. We show performance improvements achieved by replacing matplotlib with JSROOT in the CalibView app for the CMS PPS project. A key feature is the partial reading of ROOT files and handling plot data as JSON objects.

    We also present a lightweight approach using static websites...

    Go to contribution page
  24. 141. CARTopiaX: an Agent-Based Simulation of CAR T-Cell Therapy built with ROOT and BioDynaMo
    Salvador de la Torre Gonzalez
    21/11/2025, 11:15

    CAR T-cell therapy has revolutionized cancer immunotherapy by reprogramming patient T cells to recognize and eliminate malignant cells, achieving remarkable success in hematologic cancers. However, its application to solid tumors remains challenging due to the complexity and heterogeneity of the tumor microenvironment. CARTopiaX is an advanced agent-based model developed on BioDynaMo, an...

    Go to contribution page
  25. 121. Workshop discussions and closing
    Danilo Piparo (CERN)
    21/11/2025, 11:30
  26. 99. FORM: Flexible I/O and Storage for the Deep Underground Neutrino Experiment
    Andrew Paul Olivier (Argonne National Laboratory)

    The Deep Underground Neutrino Experiment (DUNE) will deploy four 10 kt
    fiducial mass time projection chambers in order to study accelerator neutrinos,supernova neutrinos, beyond the standard model physics, atmospheric neutrinos,and solar neutrinos. Reconstructing data in varying time domains over the nearly 400,000 channels needed to monitor this volume presents the complex challenge of...

    Go to contribution page
  27. 139. TBC
Building timetable...