Introduction, news and goals for 2007

1. Introduction, news and goals for 2007 • Welcome to our sixth meeting on CAT physics • New members since October: T. Cornelissen (Fellow, ATC), E. Lytken (Fellow, ATT), T. Petersen (Fellow, ATT) F. Winklmeier (Fellow, ATR), M. Wilson (Fellow, ATC) • Congratulations to M. Delmastro and T. Koffas who are now staff in the team • Next meetings: 13/03 (before ATLAS T/P week), 20/04 (before PAT worksop in Bergen), 29/05 (before ATLAS T/P week) and 04/07 (provisionally) D. Froidevaux

2. CAT physics in 2006 • A total of five meetings on CAT physics took place: • 13/03, 24/05, 30/08, 24/05, 18/12 • Attendance was ~ 30 people on average • Topics covered: • Tutorials: EventView and Distributed Analysis, Trigger AODs and EventView tools in 12.0.4 • General: TMVA tools, T/P week goals and menus (2), AOD data model, Analysis Model workshop, Computing for CAT, CAF and Proof, LHC alignment workshop, Calo calibration workshop, b-tagging at Tevatron, QCD MC tools (PS, ME, NLO) • Top physics in CAT (3), SUSY in CAT (3), SM in CAT (2) and Higgs in CAT (1) D. Froidevaux

3. CAT physics in 2006 • General impressions after one year: • Not a surprise that CAT visibility not as high as hoped for but higher than in 2005. Example of last ATLAS T/P week: • 9/22 general (plenary) talks by CAT members • 5/62 trigger/performance talks by CAT members • 1/73 physics talk by CAT member (CSC note editor, R. Hawkings) • Most CAT members working on critical activities in pit, in software, in trigger, in performance. Little time left for very different physics-oriented activity • As a consequence, CAT participation in CSC notes will not be very large for bulk of activity (target date is end of May? for completion with 12.0.5) • However, CAT participation in CDC is quite large! D. Froidevaux

4. CAT physics in 2006 • My personal perception is that CAT members are doing the right thing for the experiment and in particular the project on which they are working • This is not necessarily the right thing for their career • Some signs that dedication to project is recognised by PH management perhaps more than before (last LD research staff board!) • Collaboration with non-CERN people based at or nearby CERN is increasing: • Annecy group for SM and Higgs physics and for egamma • UK physicists for SM and top groups (W/Z+jets, trigger) • US physicists for SUSY inclusive studies • About 20 individuals from various institutes D. Froidevaux

5. CAT physics in 2006 • Items to pursue very actively in 2007 • CAT computing and Tier-3 • Supervision of young physicists at CERN (requires some coordination given numerous requests to several of us!) • Understand better how to collaborate with nearby groups (Annecy, Geneva) • Significant ramping up of CAT physics activities • Need some fresh blood in some of the working groups (Andreas has “left” SUSY coordination and Cristobal will leave SM coordination soon) D. Froidevaux

6. CAT Analysis and Computing Needs • CAT physics analysis preparation • Established working groups by different subjects • Biggest worry are computing resources to enable CAT physics analysis • In the Computing Model the role of CERN is to provide the Tier-0 and the CERN Analysis Facility (CAF) • The Tier-0 is for prompt reconstruction • The CAF is for detector calibration, alignment • Unlike outside institutes CERN is not committed yet to have analysis computing resources for its staff • We already see the problems with LXBATCH and CASTOR today • Remember: • CERN used to have the bulk of the computing power for previous experiments • In 2008 CERN (Tier-0 + CAF) will only have in ATLAS: 14% of CPU, 6% of Disk and 27% of Tape • And CERN is still the fall-back as long as analysis on the GRID does not work D. Froidevaux

7. CAT Analysis and Computing Needs • Currently we do however have CAT-specific resources at CERN • Special LSF queues with some dedicated machines plus a part of ATLAS “share” on LXBATCH • Analysis disk servers for user data on CASTOR (disk only) • Feedback: system is now workable - a real change ! • Main problems are currently in DDM operations - getting AODs to CERN • The current “solution” does not scale beyond 2007, both in terms of CPU and of disk • CAT, like the other experiment teams, needs its “Tier-3” at CERN • Disk and CPU to serve local analysis at CERN • System should support ~60 active people doing analysis • Funding situation ? • Delays in LHC also delayed purchases for Tier-0 and CAF • Savings on Tier-0 will pay most of CAF (current understanding of IT Dep. Head)? • Cost for a CERN Tier-3 will need to be secured - estimates to be done with all the partners (LHC experiments, PH, IT) and then discussed with the experiment managements • The computing management in ATLAS clearly understands the need for such a Tier-3 component of CAF for the CERN team. But CAF will also be used heavily by the experiments, especially for the initial panic with calibration, alignment and the need to understand the detector. D. Froidevaux

8. Tier-3 and Analysis Model • The ATLAS analysis model is moving towards a two-stage approach • ATHENA-based AOD analysis for the more complex parts • ROOT based final analysis on root trees produced from ATHENA • How will we use the Tier-3 ? • Analysis of limited AOD statistics in ATHENA using local batch (?) at Tier-3 • Large AOD and MC analysis productions shall run using GRID DA (Ganga) • Output root files will be moved to CERN using DDM • Fast turn-around analysis in Root to produce final results and plots at Tier-3 • Need to explore how to support such a model on the Tier-3 ! • Fast file access will be crucial for local batch and root analysis (xrootd ?) • PROOF/xrootd is currently the only framework for fast analysis in root • Currently no involvement in this from CAT/ATLAS, PROOF is ALICE/SFT • Analysis framework and software tool support is clearly an important need for CAT (in LTP): this can hopefully done in synergy with ATLAS needs • Next steps? Informal contacts with other experiments should now become more formal with active involvement of PH management D. Froidevaux

9. CAT physics in 2007 • Items to pursue actively in 2007 • Direct contributions to physics working groups • Mastering major tools for real physics analysis (distributed analysis, common statistics tools, EventView tools, AOD evaluation and improvement..) • Joint optimisation of trigger and offline D. Froidevaux