LHC detector simulations: status, needs and prospects

Oct 6, 2011, 8:00 AM → Oct 7, 2011, 6:00 PM Europe/Zurich

TH Theory Conference Room (CERN)

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

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 Draft Workshop plan

Thu, October 6

8:30 AM → 6:30 PM Physics issues

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

9:00 AM Introduction

9:10 AM ATLAS: Data and MC comparisons for inner detector tracking and vertexing

Speaker: Markus Juengst (Universitaet Bonn)

Slides 11_10_06_juengst_LPCC.pdf

9:35 AM CMS: Models and approximations used in full simulation

Speaker: Sunanda Banerjee (Saha Institute of Nuclear Physics (IN))

Slides CMSFullSimulation.pdf

10:05 AM ALICE: Geant4 validation

Speaker: Eva Sicking (Westfaelische Wilhelms-Universitaet Muenster (DE))

Slides ALICE_Geant4_esicking.pdf

10:35 AM Discussion

10:50 AM Coffee break

11:20 AM LHCb: Multiple scattering and EM physics

Speaker: Matthew Michael Reid (University of Warwick (GB))

Slides G4pdf.pdf

11:45 AM ATLAS: Data and MC comparisons for EM calorimeter, electrons and photons

Speaker: Olivier Arnaez (Johannes-Gutenberg-Universitaet Mainz (DE))

Transparents OArnaez_SimuElecPhot.pdf

12:10 PM CMS: validation results for calorimeters

Speaker: Sunanda Banerjee (Saha Institute of Nuclear Physics (IN))

Slides CalorimeterValidation.pdf

12:40 PM Discussion

1:00 PM Lunch break

2:00 PM ATLAS: Data and MC comparisons for hadronic calorimeters, jets and ETmiss

Speaker: Zachary Louis Marshall (CERN)

Slides Marshall_LHCC_2011.10.06_fix_2.pdf

2:25 PM LHCb: Hadronic interactions issues

Speaker: Nigel Watson (University of Birmingham (GB))

Slides watson_06-oct-2011_lhc_sim_ws.pdf watson_06-oct-2011_lhc_sim_ws.pptx

2:45 PM ALICE: Transport of low momentum hadrons

Speaker: Marco Van Leeuwen (University of Utrecht (NL))

Slides hadron_nucleus_alice_LPCC.pdf hadron_nucleus_alice_LPCC.ppt

3:15 PM Discussion

3:30 PM Coffee break

4:00 PM CMS: validation results for tracking detectors

Speakers: Mike Hildreth (University of Notre Dame (US)), Mike Hildreth (Department of Physics-College of Science-University of Notre Da)

Slides Hildreth_CMS_Tracker_Muon.pdf

4:30 PM ATLAS: Data and MC comparisons for muon spectrometer, including cavern background

Speaker: Laura Jeanty (Harvard University (US))

Slides jeanty_ATLAS_MS_6Oct11.pdf

4:55 PM LHCb: Simulation of RICHes

Speaker: Sajan Easo (STFC - Science & Technology Facilities Council (GB))

Slides LHCb-RICH-LCG-2011.pdf LHCb-RICH-LCG-2011.pptx

5:20 PM Discussion

Fri, October 7

8:00 AM → 2:00 PM Technical issues

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

9:00 AM LHCb: Geant4 in the LHCb simulation application

Speaker: Gloria Corti (CERN)

Slides Geant4InGauss-07Oct2011.pdf

9:30 AM ALICE: Geant4 integration

Speaker: Dr Ivana Hrivnacova (Universite de Paris-Sud 11 (FR))

Slides g4alice.1.pdf

10:00 AM ATLAS: Fast simulation, current status and plans

Speaker: Andreas Salzburger (CERN)

Slides LPCC-Workshop-AS-2011-10-07.pdf

10:30 AM CMS: Fast simulation

Speaker: Andrea Giammanco (Universite Catholique de Louvain (BE))

Slides fastsim_cernworkshop.pdf

11:00 AM Discussion

11:20 AM Coffee break

11:40 AM ATLAS: Overall simulation performance, including pile-up

Speaker: John Derek Chapman (University of Cambridge (GB))

Slides LPCCTalk20111007.pdf

12:10 PM CMS: pileup issues

Speakers: Mike Hildreth (Department of Physics-College of Science-University of Notre Da), Mike Hildreth (University of Notre Dame (US))

Slides Hildreth_CMS_Pileup.pdf Hildreth_CMS_Pileup.pptx

12:40 PM Discussion

1:00 PM Lunch break

2:00 PM → 4:50 PM Developers' outlook and feedback

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

2:00 PM Geant4 kernel: status & perspectives

Speaker: Makoto Asai (SLAC National Accelerator Laboratory)

Slides Geant4Kernel_StatusAndPerspectives.ppt

2:30 PM Geant4 physics: status & perspectives

Speaker: Dr Alberto Ribon (CERN)

Slides lpcc_detectorSim_g4physics_ribon_oct11.pdf

3:15 PM Discussion

3:30 PM Coffee break

3:50 PM Detector Simulation R&D

Speaker: Dr Rene Brun (CERN)

Slides lpcc.pdf lpcc.pptx

4:20 PM Physics Validation

Speaker: Andrea Dotti (CERN)

Slides DetectorSimulationWorkshop-V4.pdf

4:50 PM → 6:00 PM Final discussion

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 ...

4:50 PM Introduction

Speaker: Dr Pere Mato Vila (CERN)

Slides SimulationDiscussion.pptx