1. New Dimensions Collider Physics with the ATLAS Detector Graduate Research Symposium, University of California at Santa Cruz Andrea Bangert, Dan Damiani, Peter Manning Santa Cruz Institute for Particle Physics May 15th, 2009

3. 1 – LHC 2 – ATLAS Detector 3 – Standard Model of Particles 4 – Supersymmetry 5 – Universal Extra Dimensions Direction of this talk

4. Accelerates protons to near light speed Proton collisions occur at extremely high energies Particle detectors record products of collisions

5. A Toroidal LHC Apparatus (ATLAS)

6. The Standard Model of Particle Physics Incompleteness of the Standard Model Does not include gravity Does not include dark matter The mass of the Higgs boson is divergent Does not explain why there are 3 generations Accurately predicts the electromagnetic, weak, and strong interactions between quarks (the particles that make up protons and neutrons) and leptons (such as the electron). Dark Matter

7. Supersymmetry Supersymmetry and Supergravity Includes the gravitational interaction Solves the Higgs mass problem Includes a viable dark matter candidate

8. Universal Extra Dimensions (UED) Two Universal Extra dimensions Predicts 3 generations of particles Includes the gravitational interaction Includes a viable dark matter candidate

9. Conclusion No experiment has ever shown the Standard Model to be incorrect. However, there are many indications that it is incomplete. We have introduced two possible extensions of the Standard Model – Supersymmetry and Universal Extra Dimensions However, only analysis of data from the ATLAS detector will allow us to determine which is applicable. The LHC will start running in September 2009. This is a very exciting time for particle physics.

10. Thank you.

11. Acknowledgements Arial photograph copyright by CERN LHC diagram is LHC-PHO-1997-237.jpg, copyright by CERN All of the atlas images used are courtesy: atlas.ch/atlas_images “Elementary Particles” is Fermilab image 95-759 The supersymmetry image is copyright www.physics.gla.ac.uk The "ant" image is copyright www.aei.mpg.de

12. CERN and the LHC [1] “At the Heart of All Matter: the Hunt for the God Particle”, J. Achen- bach, National Geographic, March 2008 [2] “Large Hadron Collider: The Discovery Machine”, G. Collins, Scientific American, 17.01.2008 [3] “A Giant Takes On Physics’ Biggest Questions”, D. Overbye, New York Times, 15.05.2007 [4] “Building a behemoth”, O. Br ̈ ning, P. Collier, Nature, Volume 448, U Issue 7151, 19.07.2007 [5] “The CERN Large Hadron Collider: Accelertor and Experiments”, “LHC Machine”, edited by L. Evans and P. Bryant, JINST 2008 [6] “The Large Hadron Collider”, Lyndon Evans, New Journal of Physics 9 (2007) 335 [7] “Review of the Safety of LHC Collisions”, LHC Safety Assessment Group, J. Ellis, G. Giudice, M. Mangano, I. Tkachev, U. Wiedemann The ATLAS Detector [8] “The ATLAS Experiment at the CERN Large Hadron Collider”, AT- LAS Collaboration, G. Aad et al., 2008 JINST 3 S08003 [9] “ATLAS Detector and Physics Performance”, Technical Design Report, ATLAS Collaboration, 1999, CERN/LHCC 99-14 References (1)

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