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

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

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

A Toroidal LHC Apparatus (ATLAS)

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

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

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

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 This is a very exciting time for particle physics.

Thank you.

Acknowledgements Arial photograph copyright by CERN LHC diagram is LHC-PHO jpg, copyright by CERN All of the atlas images used are courtesy: atlas.ch/atlas_images “Elementary Particles” is Fermilab image The supersymmetry image is copyright The "ant" image is copyright

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