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    Tau Reconstruction Meeting

    → Europe/Zurich
    Laurits Tani (National Institute of Chemical Physics and Biophysics (EE)), Michel Hernandez Villanueva (Brookhaven National Laboratory (US))
    Live Notes
    Tau Reconstruction Meeting
    Zoom Meeting ID
    64594660372
    Host
    Michel Hernandez Villanueva
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    FCC Tau Reconstruction - September 11, 2026

    Present: Michel Villanueva, Laurits Tani, Adrian Irles Quiles, Attilio Andreazza, Federico Melis, Karl Ehataht, Maria Cepeda, Melissa Almanza Soto, Mohadeseh Dadashzadeh, Norman, Olmo Arquero, Pedro Urrejola, Teresa Nuñez, Thomas Madlener, Uli Einhaus

    Introduction

    • Kick-off meeting, aiming to coordinate efforts
    • Introductions for today, following with a round table
    • Those interested, please join the dedicated mailing list
    • This is a public forum to share ideas

    Status and plans

    Heuristic reconstruction

    • First challenge: “reconstructing a tau” doesn’t necessarily mean the same for everyone. Not everyone uses the same information.
      • Likely we will have more than one implementation in parallel. Probably OK, but let’s try to not reinvent the wheel
      • We require a broad range of expertise
    • One of our main tasks for the Reference Design Phase must be to provide feedback for detector concepts
      • Let’s try to define with the physics WG a small set of reference analyses that exercise the reconstruction capabilities
    • Sofia et al. implemented tau reco with tracks + photons for Higgs --> tau tau in FCCAnalyses
      • Can work as a base for extending to more decay modes
    • Maria and Olmo will look into integrating their PandoraPFA-based
      • Can bring an update in ~ 1 month
    • [Thomas] We better aim for Algorithms in Gaudi instead putting everything on FCCAnalyses

    ML based

    • Very active, couple of thesis from KIT, 4 papers
    • Strong interest in contributing to various studies
    • Foundation model for tau lepton reconstruction
      • Collects 4-momentum, charge identification
      • Being implemented as a Gaudi algorithm
      • Will be presented by Norman in an upcoming meeting
    • We expect more dedicated talks

    Round table

    • [Adrian Irles, Melissa Almanza] Starting to work with Maria and Olmo in ILD reconstruction, trying to use tau channels as a benchmark
    • [Karl Ehataht] Working with Laurits in ML, reconstructing visible constituents
    • [Mohadeseh] Connecting since interested in the topic
    • [Atilio and Federico] Development of the silicon detector as tracker. Bringing experience from LEP and ATLAS
    • [Maria, Olmo] Looking into Higgs --> tau tau, focusing on the tau reconstruction. With Alilio, investigating degradation of performance. With Olmo, looking into the polarization. Focusing on CLD with Full Simulation. As an institute ILD is the focus (with Valencia)
    • [Thomas] Interested in tau to see how fast simulation affects the ML tau reconstruction (it is a complicated enough object)
    • [Pedro] Collaborating with Francisca (Chile), talking with Laurits on ML reconstruction, rare tau decays (strange vs non-strange), displaced vertexes
    • [Michel] Belle II as background, involved in tau mass measurement, SM properties. For FCC, focus on documentation and training
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