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DESY Participation in an External Experiment

Describes DESY's participation in the LHC program and the recommendation to participate in the large multi-purpose experiments at the LHC. Highlights the physics reach of the LHC and the collaboration with German university groups.

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DESY Participation in an External Experiment

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  1. DESY Participation in an External Experiment Joachim Mnich PRC Meeting 26.05.2005

  2. DESY Participation in an External Experiment - External experiment is part of DESY base programme as proposed to HGF to bridge the period between end of HERA and the start of the ILC - Initial discussions at DESY in 2003 two options were discussed 1. neutrino experiment 2. LHC programme - (Re-)formation of a Strategy Group Representatives from DESY and German universities - Meetings in 2005 February 28th (incl. public presentations) March 31st + input from outside the strategy group

  3. Conclusion of Strategy Group General and broad consensus reached: - DESY should participate in the LHC programme - Recommendation to participate in the large multi-purpose experiments at the LHC: ATLAS, CMS • Why LHC? • Very broad and rich physics programme at the LHC • LHC flagship of high energy physics for one to two decades • most crucial results for the evolution of physics • Large physics overlap with HERA and LHC physics • Natural development of DESY expertise in HEP experimentation • similar detectors, collaborations, data analysis, computing, ... • Collaboration with German universities (HEP groups) • HERA  LHC  ILC

  4. Physics at the LHC The Large Hadron Collider LHC protons protons Atlas - High energy: 14 TeV - High luminosity: 1033 1034/cm2/s - First collisions in 2007 - Initial physics runs 2008 • Large cross sections and event rates: • 1 tt-pair per second • 1 Higgs boson per minute at 1033/cm2/s

  5. Two Examples for the LHC Physics Reach Atlas Physics beyond the SM Reach extends to multi-TeV range SM Higgs boson discovery SUSY, EDM, new vector bosons, heavy neutrinos, technicolour, compositness, lepto-quarks, ...

  6. A DESY participation at the LHC: The bridge from HERA to the ILC HERA LHC ILC Final Meeting March 21-24 DESY, Hamburg • - Natural continuation of HERA programme • Ideal preparation for physics at the ILC • Synergy also for DESY theory group Workshops demonstrate physics overlap Both workshops will continue...

  7. Collaboration with German University Groups Most German HEP groups are strongly involved in the LHC experiments: ATLAS - Bonn - Dortmund - Freiburg - Heidelberg - Mainz - Mannheim - LMU München - MPI München - Siegen - Wuppertal CMS - Aachen - Hamburg - Karlsruhe

  8. Scope and Plans of the DESY Participation at the LHC • Resources to be fit into frame given by ongoing HEP programmes • HERA and ILC • Intention is a long-term engagement • possibly extending to concurrent participation in LHC and ILC physics • - DESY contributions should be visible • Twofold DESY engagement: • Provide Tier-II analysis centres • for ATLAS and CMS • 2. Experimental group (physics analysis & detector contribution) • in ATLAS or CMS • Very positive reaction • from both experiments • and the German groups

  9. Tier-II Analysis Centres Computing of the LHC experiments is based on Grid technology LCG project: LHC Computing Grid DESY RAL Oxford FNAL Chicago T1 T2 IC London T1 FZK Karlsruhe T1 T0 Legnaro IN2P3 Lyon T2 T1 T1 Uni Florida CNAF Bologna T2 T2 T1 CIEMAT Madrid PIC Barcelona Tier 0: first data processing at CERN Tier 1: data re-processing  10 worldwide Tier 2: data selection, analysis & MC production  1-3 per country & expt. (Europe) Tier 3: physics analysis & MC production at universities

  10. Tier-II Analysis Centres DESY is ideally suited as Tier II for german universities • Competence: • existing Grid infrastructure at DESY • - HERA experiments • - ILC studies • extensively use LCG • Prospects: • keep & develop at DESY competence in • - treatment of large data volumes • - operation of complex computing architectures • - participation in world wide computing devolopments • - Ideal preparation for ILC Long-term strategic orientation from HERA to ILC analysis centre - Matches DESY charge to provide support to the German HEP community

  11. Status Tier-II Analysis Centres • - Prototyp infrastructure being set up • in collaboration with Uni HH (CMS) • Discussions with both experiments • started • Participation of DESY in LCG • service challenges planned • (June/July) • - exercise Grid tools on large data • samples • - moving data between Tiers • - distributed analysis

  12. Participation in ATLAS or CMS? Status and plans: DESY group nominated to - collect information from both experiments on possible contributions - evaluate the differences in these possibilities between the two experiments e.g. in terms of prospects of successful impact from DESY - not supposed to become the LHC group - not supposed to negotiate with the collaboration Contact to experiments established In discussions with German groups - received very positive reactions - CERN visit next week to discuss with experiments  K. Borras, P. Kostka, A. Meyer, J. Mnich, D. Pitzl, C. Youngman, P. Zerwas

  13. Items of discussion • - DESY contributions to physics analysis • interesting topics where DESY participation is needed/welcome • match with DESY interest & expertise, incl. theory group • synergy between Tier-II analysis centre and DESY analysis group • Possible DESY contributions to • baseline detectors for 2007/2008 • planned upgrades and replacements and their time lines • includes hardware and software contributions • Collaboration with German unversity groups • evaluate overlap in physics interest • where could DESY provide valuable support to German groups • (besides Tier-II) • Final decision ATLAS versus CMS will be based on • Input from group • Interest of DESY scientists • General considerations

  14. Detector contributions under discussion • Examples based on first reactions of experiments: • Data Acquisition & High Level Trigger • reconstruction & selection software • close to physics • detector control • synergy with ILC detector • Detector commissioning • important activity of experiments • in 2005-2008 • special expertise at DESY • Forward detectors • interest at DESY & open issues • at the experiments • Detector upgrades/replacements • vertex detectors (pixel) • very forward (420 m) • - around 2015: very high luminosity 1035/cm2/s (SLHC) • new tracker, DAQ upgrades, ...

  15. Summary • Broad consensus for a DESY participation in the LHC • LHC is physics at the high energy frontier • - ideal continuation of HERA and • - ideal preparation of the ILC physics programme • All German HEP institutes participate in LHC experiments • - DESY could provide valuable support for universities • e.g. computing • Tier-II ideal opportunity to position DESY as an ILC analysis centre • Visible DESY contributions to LHC experiments still possible • and very welcome by the experiments • - Discussion with the experiment and • the German LHC groups started

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