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Elementary Particle Physics Experiment: The ATLAS experiment at the LHC

Elementary Particle Physics Experiment: The ATLAS experiment at the LHC. University of Massachusetts, Amherst Graduate Research Orientation 1 Feb 2010. The UMass ATLAS Group. Faculty Ben Brau - LGRT 1032 Carlo Dallapiccola - LGRT 1038 Stephane Willocq - LGRT 1042 Postdoctoral Researchers

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Elementary Particle Physics Experiment: The ATLAS experiment at the LHC

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  1. Elementary Particle Physics Experiment:The ATLAS experiment at the LHC University of Massachusetts, AmherstGraduate Research Orientation1 Feb 2010 Experimental Particle Physics

  2. The UMass ATLAS Group • Faculty • Ben Brau - LGRT 1032 • Carlo Dallapiccola - LGRT 1038 • Stephane Willocq - LGRT 1042 • Postdoctoral Researchers • Ed Moyse, Elisa Pueschel, Niels Van Eldik, Martin Woudstra - CERN • Graduate Students • Andrew Meade, Emily Thompson - CERN • German Colon, Preema Pais, Tulin Verol - LGRT 1036 Experimental Particle Physics

  3. What is Particle Physics About? Experiments can address long standing puzzles / questions: • What are the fundamental constituents of matter? • What are the fundamental forces between elementary particles? • Can the forces of nature be unified? Including gravity? • What is the origin of mass? • What is the origin of the matter-antimatter asymmetry of the Universe? • What is dark matter? • Are there extra dimensions? + many more… Experimental Particle Physics

  4. How can we answer these Fundamental Questions? • Particle Accelerators • Reach very high collision energies to probeextremely small distance scales (< 10-18 m) • Research at the energy frontier (a few TeV) with theATLAS experiment at the Large Hadron Collider (LHC) 10 x higher energy than previous colliders search for • Higgs boson (origin of mass?) • SuperSymmetric particles (dark matter candidate?) • New interactions (heavy gauge bosons, extra dimensions?) Experimental Particle Physics

  5. 14 TeV The Large Hadron Collider (LHC) • Proton-proton collider circumference = 27 km • Energy = 7 TeV / beam√s = 14 TeV • Stored energy / beam = 350 MJ (!) • Bunch spacing = 25 ns 40 MHz crossing rate • Design luminosity= 1034 cm-2 s-1 • Number of interactionsper crossing ~23 Collisions expected in late 2009 Run for ~10-15 years Lake Geneva  CERN Main Site  ATLAS CMS Experimental Particle Physics

  6. The ATLAS Detector @ LHC EM Calorimeter Muon Detectors Inner Tracker Hadronic Calorimeter Diameter 25 m Barrel toroid length 26 m End-cap end-wall chamber span 46 m Overall weight 7000 Tons Experimental Particle Physics

  7. Experimental Particle Physics

  8. ▪ November 2005 February 2008 August 2006 September 2006 Experimental Particle Physics

  9. ATLAS Data Event Experimental Particle Physics

  10. UMass Work on ATLAS • Software development for Muon Spectrometer • Leading muon reconstruction effort(SW co-coordinator, EM event data model leader) • Validation of detector description, performance improvements • Physics analysis = Search for new physics • Search for new heavy gauge bosons (new interactions) • Alternatives to Higgs mechanism (origin of mass) • Signs of extra (large) dimensions: micro black holes • Model-Independent: Hints of things we haven’t thought of yet • More information at http://people.umass.edu/eppex/ Experimental Particle Physics

  11. LHC Schedule • First Physics Run at 3.5 GeV on 3.5 GeV begins now. • Run will continue through 2010 and 2011, with a goal luminosity of 1 fb-1. • All splices will be repaired in a long (~year) shutdown. • High-energy 7GeV on 7GeV will begin ~2013. Experimental Particle Physics

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