ATLAS DC2 SUSY Challenge

Updated 25 November 2004



  • Introduction
  • News
  • Plans and Timescales
  • Tasks
  • Agendas and Minutes


    • Introduction

    The goals of the SUSY Working Group for DC2 are to validate the new simulation and reconstruction software and carry out sample physics analyses using data generated at two SUSY points.

    The first model point (sample A11) is that used at DC1 and is described here. The DC1 analysis was written up in ATL-COM-PHYS-2003-055.
    The second is a 'coannihilation' model with soft taus (sample A9) as described here.
    Further details of the generation phase can be found here
    Results of DC1 validation can be found here.



    News

    21 October 2004: A DC2 SUSY phone meeting was held on 19th October. Frank reported on studies/calibration of jets with DC2 AOD, and also a first look at physics plots from the A9 coannihilation sample. A9 SUSY AOD files for about 30k events digitized without noise and reconstructed with 8.7.0 are available from /afs/usatlas.bnl.gov/offline/data/susy/8.7.0. Dan reported on plans for physics commissioning / background estimation work using the DC2 SM samples. There was then a discussion of plans for the November physics week and Rome. People are encouraged to check and experiment with the Ian, Frank and Davide's AOD analysis code (see below). People who volunteered back in March to study specific physics objects (see list near bottom of page) are encouraged to present updates of the status of their analyses at the SUSY WG parallel session on 3rd November (contact Frank or Dan). Ignacio Aracena has been simulating 50K DC1 SUSY events to increase the A11 stats for comparison with DC1. Using the grid he has so far simulated 46800 events with 805 and digitised 34200 with 806. When possible to run reco on the grid he will try to generate some AODs and produce some plots for November.

    28 September 2004: DC2 simulated events (A9/A11) are now appearing (200k A9). Davide has been digitising and reconstructing using 8.7.0 at LBL. Output will be as AOD. This means that analysis from now on should use the PAT framework (see below) and *not* Frank's RecoCBNT code (although people should port C++ code from one to the other). Ian and Davide have created skeleton PAT classes located here. For details see Ian's talk here. People are encouraged to try this out. Phone meetings will restart after Freiburg. Ignacio Aracena (Bern) and Nurcan Ozturk (UTA) have volunteered to coordinate further SUSY-specific productions. Initially producing extra 50k events from A11 to make 100k total for comparison with DC1. Reconstruction subsequently of A9/A11 samples will use 9.0.x.

    27 August 2004: Gianluca Comune has been looking at atlfast events produced from the DC2 A9 (coannihilation) sample. Some physics are here and here. They look reasonable within the limited stats.

    10 August 2004: Tomasso Lari has been looking at muons with MuonBoy in 8.3.0 and comparing with Moore/MuID. Plot is here and text from a mail describing results here. Gianluca Carlino, Michela Biglietti and colleagues have been studying muons with Moore in 8.3.0. A .ppt talk summarising their results can be found here.

    28 June 2004: Web-page has now been updated with new priorities and tasks. Frank has reconstructed 20k DC1 events with 8.3.0 and put them on BNL AFS at /afs/usatlas.bnl.gov/offline/data/susy/8.3.0. Electrons are currently having problems with efficiency. The atlfast generator validation hbook ntuples can be found on castor at /castor/cern.ch/atlas/project/dc2/preprod/evgen804/dc2.00xxx.evgen804/ntuple. We are interested in samples A9 and A11 initially.

    23 June 2004: First results from reconstruction of old DC1 simulated events using 8.2.0 were presented here for jets, etmiss and Muonboy muons. Some analysis of the DC2 G4 preproduction A11 (co-annihilation) sample has also been performed by Ignacio Aracena here . Luis March has looked at some atlfast ntuples simulated from the DC2 A11 sample generator info here . See last etmiss plot or last transparency of Tovey etmiss validation talk from SUSY WG meeting.

    11 June 2004: Frank Paige has now succeeded in running reconstruction from 8.2.0 on about 10,000 DC1 SUSY events. The root ntuples are available on BNL AFS (if you can access it) at /afs/usatlas.bnl.gov/offline/data/susy/8.2.0. The same files have been placed in a tarred and gzipped archive on CASTOR at CERN at /castor/cern.ch/user/d/dtovey/susy820.tar.gz. Please let me know if you have problems accessing or unpacking it. The intention is that people should be able to generate some preliminary validation plots for the meeting in the next ATLAS week. Please let Frank and Dan know if you would like to give a talk.

    28 May 2004: Web-page updated with links to 25 May SUSY meeting at BNL here and minutes here . Intention now is to use 8.2.0 for reconstruction, either at local sites using the pacman (see e.g. here ) kit (jobOptions to be posted on this site) or at BNL (files will be made available on BNL AFS). Tommaso Lari has already produced some nice plots using MuonBox in 8.2.0 (see here). Junichi Tanaka has also been looking at b-tagging performance here. For analysis Frank has updated the RecoCBNT702 package to include a perl script to automate the process of rebuilding the t3333 files. A phone meeting will be organised for once we have a working set of jobOptions for 8.2.0.

    13 May 2004: At the DC2 validation meeting on 12th May Davide reported that reconstruction is unlikely to be working in the 8.0.x branch release, and is unlikely to be fixed (talk here). We had hoped that this branch would be sufficiently stable to allow reconstruction of DC1 data. It now seems likely that we should wait for 8.2.0, due on 19th May. Simulation of the A9 and A11 DC2 SUSY samples (see here) using 8.0.x is almost ready to go (although some theorist input to validation of tauola would be welcomed).

    26 April 2004: Frank's latest validation plots for 8.0.1 can be found here. Expanded sets of plots for the various objects listed here are one of the goals for 8.0.x (i.e. a fully working version!).

    23 April 2004: Web-page list of volunteers for tasks updated. Validation of tauola for co-annihilation point now being worked on (Bern group).

    14 April 2004: Problems have been found (IH) with running JIMMY (HERWIG) with SUSY events. Intention now is to drop coannihilation model production until problem is solved and polarisation in tauola validated. Note that it is vital that the tauola stuff be checked before production (class A).

    30 March 2004: Root ntuple analysis code is now available here, together with a test file. Currently this just fills some jet histograms and will need modification for specific objects (in bookHists.C and fillHists.C).

    30 March 2004: Frank's latest validation plots for 7.8.0 can be found here. Expanded sets of plots for the various objects listed here are one of the goals for 8.0.x.


    Plans and Timescales

    See also here under "Introduction".

    Tasks

    The following tasks need volunteers :
    Aim should be to produce ATLAS Scientific Note based on ATLAS note(s) summarising validation and physics studies, as well as continuous feedback to validation.


    Agendas and Minutes

    5 November 2004: Presentation of results of AOD analyses by Davide Costanzo during physics plenary meeting .

    3 November 2004: Presentation of results of AOD analyses by Ian Hinchliffe at SUSY WG meeting .

    19 October 2004: DC2 SUSY phone meeting .

    28 September 2004: Discussion of AOD analysis by Ian Hinchliffe and presentation of Moore validation by Francesco Conventi during SUSY group meeting .

    23 June 2004: DC2 session during SUSY WG meeting .

    25 May 2004: DC2 discussion during SUSY WG meeting at BNL . Minutes here .

    15 March 2004: DC2 SUSY Challenge Phone Conference







    Dan Tovey