The Standard Model of particle physics is being tested with ever increasing precision in proton-proton collisions by the ATLAS experiment at the Large Hadron Collider (LHC). While the masterpiece of the model, the Higgs boson, has been discovered at the LHC, many fundamental questions have no answer within the present understanding of particle physics: Why is there more matter than antimatter; what is dark energy; why do neutrinos have mass?

To answer these questions, precision measurements performed at the LHC need to be compared with precision model simulations, which are computationally demanding. DOE’s leadership class supercomputers are becoming a necessity to ensure the U.S. physics program at the LHC meets its scientific goals. The computing and data challenges will increase at least by an order of magnitude with the High-Luminosity LHC looming on the horizon. This project will drive new software optimization efforts to improve the computational efficiency of precision model simulations and will provide researchers with 160 million simulated collisions.