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First results from the ATLAS experiment at the LHC

First results from the ATLAS experiment at the LHC. Particle Physics – Theory and Experiment Construction and preparation activities First results from 2009 run Physics perspectives for 2010 and beyond. W. Verkerke. High Energy Physics Intro – Theory.

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First results from the ATLAS experiment at the LHC

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  1. First results from the ATLAS experiment at the LHC • Particle Physics – Theory and Experiment • Construction and preparation activities • First results from 2009 run • Physics perspectives for 2010 and beyond W. Verkerke Wouter Verkerke, NIKHEF

  2. High Energy Physics Intro – Theory • Aim to describe all matter and forces in terms of fundamental particles and interactions • Working model: ‘the Standard Model’ Constituentsof ordinary matter Quantum Field Theory Particles Lagrangian = ‘Feynman rules’ Perturbation Theory Interactions Wouter Verkerke, NIKHEF

  3. The standard model has many open issues • Gravity is not part of Standard Model • Unification of Gravity and SM physics  String Theory • Requires existence of Higgs Boson  But not seen so far • Mechanism to generate particle masses through ‘Higgs mechanism’ • Other open questions • Why are quark masses so different? • Why does matter dominate over anti-matter? • What are the constituents of Dark Matter? • Several reasons to believe thatthey may be interesting physicsphenomena at energy scales of 1 TeV • SM Theory without Higgs breaks down around this energy • Many extensions of the SM predict new phenomena on this scale Wouter Verkerke, NIKHEF

  4. Experimental particle physics • Scattering experiment = Fundamental concept to most experiments in the past 100 year: 1909 Rutherford scattering: a particles on target E = ~1 MeV 1947 Cosmic ray on target: discovery of KS meson E = ~100 MeV First circular proton accelerators 1954 E = 6000 MeV 1989 Large Electron-Positron collider E = 200.000 MeV 2009 Large Hadron collider Higgs boson? E = 14.000.000 MeV

  5. Particle Physic today – Large Machines Wouter Verkerke, NIKHEF

  6. The Large Hadron collider Wouter Verkerke, NIKHEF

  7. High Energy Physics intro -- Experiment Wouter Verkerke, NIKHEF

  8. The ATLAS experiment – Overview Wouter Verkerke, NIKHEF

  9. The ATLAS experiment – Overview 44 m 25m Wouter Verkerke, NIKHEF

  10. The ATLAS experiment – Overview Measure p of muonsTracking Measure E of all particles Calorimeters convert absorbed energy in light Measure p of charged particlesSilicon & gas based trackingdetectors in B field Wouter Verkerke, NIKHEF

  11. Commissioning ATLAS – Plan of work • Construction • Cosmic ray data taking • Understanding and Calibrating detector • Low E Collision data • Understanding and Calibrating detector • Observing known physics • High E Collision data • Observing known (and new?) physics 199x - 2008 2008 - 2009 Focusof thispresentation end of 2009 2010 onwards Wouter Verkerke, NIKHEF

  12. The ATLAS experiments – Cosmics commissioning • In absence of beam, can test particle detection performance using cosmic particles (25 Hz  500 Mevt) Wouter Verkerke, NIKHEF

  13. The ATLAS experiment – Results from 2009 run • LHC time line, starting at moment of first injection • Start of circulation of both beams (Day 1 - Nov 20 18.15 / 22.15) • Collisions at energy of 900 GeV (Day 4 - Nov 23) • Collisions at energy of 2.36 TeV (Day 24 - Dec 13) • Winter shutdown (Dec 16) Wouter Verkerke, NIKHEF

  14. The ATLAS experiment – Results from 2009 run Wouter Verkerke, NIKHEF

  15. The ATLAS experiment – Results from 2009 run Wouter Verkerke, NIKHEF

  16. Results from 2009 run – Basic detector performance Wouter Verkerke, NIKHEF

  17. Results from 2009 run – Medium Energy Physics KSp+p- (Tracking) p0gg (Calorimeter) Wouter Verkerke, NIKHEF

  18. Results from 2009 run – High Energy Physics • Properties of pp collisionsat 900 GeV beam energy • Formation of particle jets • Distribution in transverse E • Distribution in azim. angle • Compare with simulation • Physics sim. + detector sim. Transverse energy azim. angle (h=-log(tan q/2))

  19. Challenges and activities for next year(s) • Higher beam energy : (0.9/2.36)  7  10 TeV • Higher intensity (all of 2009 data = 1 second of data at design intensity) • High performance preselection of events will be very important • Computational challenges in dealing with data volume • Physics analysis on high energy data • Understand what known physics processed look like at this energy • Start looking for events that don’t look like SM (known physics) Wouter Verkerke, NIKHEF

  20. GRID computing • Computing facilities distributedaround the world • 10 large ‘Tier-1’ centers(centralized reconstructedand simulation) • O(50) smaller Tier-2 centers(physics analysis and simulation) • Many more small Tier-3 centers • Connection and organizationthrough GRID technology • ‘World-wide batch system’ • ‘World-wide file catalogue’ • Current cumulative capacity • 100.000 CPUS available • Storage space: 10 Pb Wouter Verkerke, NIKHEF

  21. Exercising data distribution Current situation Event count low, But event size 100x final size (data reduction disabled) Can already exercise data management systemwith realistic data volumes Wouter Verkerke, NIKHEF

  22. Summary & Outlook Wouter Verkerke, NIKHEF

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