LHC detector simulations: status, needs and prospects

Europe/Zurich
TH Theory Conference Room (CERN)

TH Theory Conference Room

CERN

Michelangelo Mangano (CERN), Pere Mato Vila (CERN)
Description

After one full year of validation on collider data, and in preparation for the higher-precision and higher-statistics needs of the coming years, time is ripe for a topical workshop to assess the status of LHC detector simulations, bringing together the current experience of the users from the experiments' physics performance groups, and the developers of the major simulation codes

More details on the proposed format and plan are given in the attached document.

Workshop plan
Participants
  • Alexander Kaukher
  • Alexandru GRECU
  • Andrea Dotti
  • Andrea Giammanco
  • Andrea Perrotta
  • Andreas Schaelicke
  • Filimon Roukoutakis
  • Francisca Garay Walls
  • Gloria Corti
  • John Apostolakis
  • John Harvey
  • Krzysztof Jan Sliwa
  • Laura Jeanty
  • Makoto ASAI
  • Marc Verderi
  • Marco Delmastro
  • Markus Jungst
  • Melinda Siciliano
  • Michelangelo Mangano
  • Olivier Arnaez
  • Pere Mato
  • Philip Clark
  • Robert Duane Harrington Jr
  • Sajan Easo
  • Silvia Miglioranzi
  • Stefano Perazzini
  • Zachary Louis Marshall
  • Thursday, 6 October
    • 08:30 18:30
      Physics issues TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Goals:
      a- Review what was learned from the comparison of collisions' data and simulations: what worked, what didn't work and got fixed (how), and what still needs to be improved
      b- Identify benchmarks for the needed improvements, motivated by specific physics performance goals

      • 09:00
        Introduction 10m
      • 09:10
        ATLAS: Data and MC comparisons for inner detector tracking and vertexing 25m
        Speaker: Markus Juengst (Universitaet Bonn)
        Slides
      • 09:35
        CMS: Models and approximations used in full simulation 30m
        Speaker: Sunanda Banerjee (Saha Institute of Nuclear Physics (IN))
        Slides
      • 10:05
        ALICE: Geant4 validation 30m
        Speaker: Eva Sicking (Westfaelische Wilhelms-Universitaet Muenster (DE))
        Slides
      • 10:35
        Discussion 15m
      • 10:50
        Coffee break 30m
      • 11:20
        LHCb: Multiple scattering and EM physics 25m
        Speaker: Matthew Michael Reid (University of Warwick (GB))
        Slides
      • 11:45
        ATLAS: Data and MC comparisons for EM calorimeter, electrons and photons 25m
        Speaker: Olivier Arnaez (Johannes-Gutenberg-Universitaet Mainz (DE))
        Transparents
      • 12:10
        CMS: validation results for calorimeters 30m
        Speaker: Sunanda Banerjee (Saha Institute of Nuclear Physics (IN))
        Slides
      • 12:40
        Discussion 20m
      • 13:00
        Lunch break 1h
      • 14:00
        ATLAS: Data and MC comparisons for hadronic calorimeters, jets and ETmiss 25m
        Speaker: Zachary Louis Marshall (CERN)
        Slides
      • 14:25
        LHCb: Hadronic interactions issues 20m
        Speaker: Nigel Watson (University of Birmingham (GB))
        Slides
      • 14:45
        ALICE: Transport of low momentum hadrons 30m
        Speaker: Marco Van Leeuwen (University of Utrecht (NL))
        Slides
      • 15:15
        Discussion 15m
      • 15:30
        Coffee break 30m
      • 16:00
        CMS: validation results for tracking detectors 30m
        Speakers: Mike Hildreth (Department of Physics-College of Science-University of Notre Da), Mike Hildreth (University of Notre Dame (US))
        Slides
      • 16:30
        ATLAS: Data and MC comparisons for muon spectrometer, including cavern background 25m
        Speaker: Laura Jeanty (Harvard University (US))
        Slides
      • 16:55
        LHCb: Simulation of RICHes 25m
        Speaker: Sajan Easo (STFC - Science & Technology Facilities Council (GB))
        Slides
      • 17:20
        Discussion 25m
  • Friday, 7 October
    • 08:00 14:00
      Technical issues TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Review requirements by the experiments for improvements on the technical side: CPU performance, architectural issues, fast simulations, handling of pileup, etc..

      • 09:00
        LHCb: Geant4 in the LHCb simulation application 30m
        Speaker: Gloria Corti (CERN)
        Slides
      • 09:30
        ALICE: Geant4 integration 30m
        Speaker: Dr Ivana Hrivnacova (Universite de Paris-Sud 11 (FR))
        Slides
      • 10:00
        ATLAS: Fast simulation, current status and plans 30m
        Speaker: Andreas Salzburger (CERN)
        Slides
      • 10:30
        CMS: Fast simulation 30m
        Speaker: Andrea Giammanco (Universite Catholique de Louvain (BE))
        Slides
      • 11:00
        Discussion 20m
      • 11:20
        Coffee break 20m
      • 11:40
        ATLAS: Overall simulation performance, including pile-up 30m
        Speaker: John Derek Chapman (University of Cambridge (GB))
        Slides
      • 12:10
        CMS: pileup issues 30m
        Speakers: Mike Hildreth (Department of Physics-College of Science-University of Notre Da), Mike Hildreth (University of Notre Dame (US))
        Slides
      • 12:40
        Discussion 20m
      • 13:00
        Lunch break 1h
    • 14:00 16:50
      Developers' outlook and feedback TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Goal: review the plans for future developments, also in view of the needs presented by the experiments in Session 2

      • 14:00
        Geant4 kernel: status & perspectives 30m
        Speaker: Makoto Asai (SLAC National Accelerator Laboratory)
        Slides
      • 14:30
        Geant4 physics: status & perspectives 45m
        Speaker: Dr Alberto Ribon (CERN)
        Slides
      • 15:15
        Discussion 15m
      • 15:30
        Coffee break 20m
      • 15:50
        Detector Simulation R&D 30m
        Speaker: Dr Rene Brun (CERN)
        Slides
      • 16:20
        Physics Validation 30m
        Speaker: Andrea Dotti (CERN)
        Slides
    • 16:50 18:00
      Final discussion TH Theory Conference Room

      TH Theory Conference Room

      CERN

      Discuss possible ways to monitor progress in this area, and to steer some immediate concrete work. Possible proposals:

      • Define a reference version of Geant 4, emergent from the current validation studies with LHC data
      • Identify benchmarks for improvements in the simulations, motivated by specific physics performance goals
      • Formulate a recommendation to SFT and the experiments for a new mandate for the Geant 4 validation forum
      • Propose a format for future meetings of this type:
        o hand over to the revamped validation forum?
        o decide to iterate the workshop on a yearly basis?
        o setup focused WGs on separate issues (physics aspects, technical aspects, ....)
        o ...
      • 16:50
        Introduction 20m
        Speaker: Dr Pere Mato Vila (CERN)
        Slides