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ATLAS is an experiment operating at the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. The LHC is the world's highest energy accelerator, and will be the premier experimental HEP collider facility for many years to come.

The foremost question of HEP is the source of so-called "electroweak symmetry breaking" (EWSB), related to the issue of the origin of mass. The Standard Model (SM) of particle physics postulates the existence of the Higgs boson to solve this issue. In July 2012, ATLAS and CMS, the two large LHC experiments, announced the discovery of a new particle with properties very much like those predicted for the Higgs boson. As a result, the 2013 Nobel Prize in Physics was awarded to Peter Higgs and Francois Englert, two of the theorists who, in 1964, proposed this solution for EWSB. Whether this new particle behaves precisely as expected for the Higgs boson, or whether there are discrepancies that could point the way to new physics, is an area of intensive study. In addition, even with the Higgs boson, there are many questions that cannot be answered by the SM. Many other scenarios (eg. supersymmetry, technicolor, even the existence of extra spacetime dimensions) have been proposed. The LHC and ATLAS are designed to explore in detail physics at the TeV scale, where it is widely expected that signs of new physics should be discoverable.

The Columbia ATLAS group has played a number of roles in the experiment, including leading the development (from design through installation and commissioning) of the readout electronics of the liquid argon calorimeters. We are currently heavily involved in physics analysis with the enormous data samples recorded in Run 2 at the LHC (2015-2018) at a proton-proton center-of-mass energy of 13 TeV, and with early 13.5 TeV Run 3 data recorded in 2022. In addition, we are developing the next generation of readout electronics for the ATLAS calorimeter system, for a future upgrade of the detector.

REU students working on ATLAS will be based at Nevis Labs in New York, and will work on the search for new physics by analyzing the Run 2 and Run 3 data. There is also the possibility to be involved in the development of readout electronics for the HL-LHC upgrade of the ATLAS liquid argon calorimeter system.