1. 1 Austrian Participation in ATLAS  Innsbruck University  FH Wiener Neustadt  Austrians in ATLAS at CERN RECFA meeting, Vienna, 11.3.2011 Emmerich Kneringer Inst. of Astro- and Particle Physics Leopold-Franzens-University of Innsbruck

2. 2 Remember 2004: RECFA in Innsbruck Victor-Franz-Hess Laboratory

3. 3 Basic facts 1998: the High Energy Physics group joined the ATLAS Collaboration Group structure  1 Professor: D. Kuhn (Head of group)  3 Associate Professors: Girtler, Rudolph, Kneringer  1.5 non-permanent Scientific Associates: Jais, Mair  3 PhD students: Jussel, Firdous, Lukas [CERN]  2 Diploma students: Ritsch, Neuner [teacher] ATLAS activity financed by the (Federal Ministry for Science and Research) until end of 2012 The sucessor of D. Kuhn has been appointed two years ago: astroparticle physicist O. Reimer

4. 4 Activities in ATLAS Physics a) B-physics b) QCD c) Detector simulation Detector operation  shifts  Muon Detector (RPC, in the ATLAS control room)  Data quality monitoring (muon combined performance)  Tier0 monitoring (Comp@P1) GRID  coordination and management of the installation of the Austrian federated Tier2  operating the Innsbruck part No hardware contributions, only financial contribution to Trigger DAQ

5. 5 a) B-physics Within the B-physics group of ATLAS 1. Measurement of B S oscillations  using the hadronic B S decays B S  D S  and B S  D S a 1 (with D S   ) 2. Planned: Measurement of braching ratios in rare B decays  e.g. B S   +    motivation: enhanced branching ratio in extensions of the Standard Model  only if project proposal is successful Both measurements need > fb  1 of data  no results from first ATLAS data, yet we are looking at the  and D S particles in the B S mixing analysis

6. 6 b) Phenomenology of Quantum Chromodynamics Efforts to describe inelastic proton-(anti-) proton events (Minimum Bias) using QCD Monte Carlo generators Tuning of PYTHIA 6.4 Multiple Parton Interaction model parameters (4 parameters being varied)  Published data used  CDF run II at 1.96 TeV  ATLAS at 0.9 and 7 TeV New result  Taking  QCD in FSR (=PARP[72]) as a 5 th parameter  improved description of p T spectrum for p T > 3 GeV

7. 7 c) ATLAS Detector simulation Standard is: Geant4 Interest in Fast Simulations  for future high precision analyses (e.g. W-mass) PhD student  “Monte Carlo Detector simulation tuning using ATLAS collision data“  Presently: Comparison and validation of the energy loss inplementations in the tracking geometry Diploma student  “Fast calorimeter punch-through simulation for the ATLAS detector“ Work in cooperation with the CERN ATLAS Inner Detector group.

8. 8 GRID computing Innsbruck initiated the Austrian federated WLCG Tier-2 in 2002  Pilot Projekt, 0.5 FTE 2 yrs. (02 – 04) It is part of the computing infrastructure for ATLAS and CMS. Distributed installation management/administration Innsbruck part ( 262 cores, 120 TB disk space ) is now routinely operated by 1.5 people  associated to the FZK Tier-1 Obligations from ATLAS MoU until 2012 For details about GRID computing in Austria: see talk by D. Liko

9. 9 Conclusion & Outlook We invested 12 years into the preparation of the ATLAS experiment We are ready for interesting physics There is continuous interest from students in this field The future of the ATLAS group in Innsbruck depends on  whether new physics shows up at LHC  whether our project proposal(s) are successful  whether our new boss Prof. O. Reimer thinks we do a good job