LHC detector simulations: status, needs and prospects

6 Oct 2011, 08:00 → 7 Oct 2011, 18:00 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

Thursday, 6 October

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

1 Introduction

2 ATLAS: Data and MC comparisons for inner detector tracking and vertexing

Speaker: Markus Juengst (Universitaet Bonn)

Slides 11_10_06_juengst_LPCC.pdf

3 CMS: Models and approximations used in full simulation

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

Slides CMSFullSimulation.pdf

4 ALICE: Geant4 validation

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

Slides ALICE_Geant4_esicking.pdf

5 Discussion

10:50 Coffee break

6 LHCb: Multiple scattering and EM physics

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

Slides G4pdf.pdf

7 ATLAS: Data and MC comparisons for EM calorimeter, electrons and photons

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

Transparents OArnaez_SimuElecPhot.pdf

8 CMS: validation results for calorimeters

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

Slides CalorimeterValidation.pdf

9 Discussion

13:00 Lunch break

10 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

11 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

12 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

13 Discussion

15:30 Coffee break

14 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

15 ATLAS: Data and MC comparisons for muon spectrometer, including cavern background

Speaker: Laura Jeanty (Harvard University (US))

Slides jeanty_ATLAS_MS_6Oct11.pdf

16 LHCb: Simulation of RICHes

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

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

17 Discussion

Friday, 7 October

Technical issues

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

18 LHCb: Geant4 in the LHCb simulation application

Speaker: Gloria Corti (CERN)

Slides Geant4InGauss-07Oct2011.pdf

19 ALICE: Geant4 integration

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

Slides g4alice.1.pdf

20 ATLAS: Fast simulation, current status and plans

Speaker: Andreas Salzburger (CERN)

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

21 CMS: Fast simulation

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

Slides fastsim_cernworkshop.pdf

22 Discussion

11:20 Coffee break

23 ATLAS: Overall simulation performance, including pile-up

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

Slides LPCCTalk20111007.pdf

24 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

25 Discussion

13:00 Lunch break

Developers' outlook and feedback

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

26 Geant4 kernel: status & perspectives

Speaker: Makoto Asai (SLAC National Accelerator Laboratory)

Slides Geant4Kernel_StatusAndPerspectives.ppt

27 Geant4 physics: status & perspectives

Speaker: Dr Alberto Ribon (CERN)

Slides lpcc_detectorSim_g4physics_ribon_oct11.pdf

28 Discussion

15:30 Coffee break

29 Detector Simulation R&D

Speaker: Dr Rene Brun (CERN)

Slides lpcc.pdf lpcc.pptx

30 Physics Validation

Speaker: Andrea Dotti (CERN)

Slides DetectorSimulationWorkshop-V4.pdf

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 ...

31 Introduction

Speaker: Dr Pere Mato Vila (CERN)

Slides SimulationDiscussion.pptx