From CERN ATLAS: “Exploring the scientific potential of the ATLAS experiment at the High-Luminosity LHC”

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From CERN ATLAS

17th May 2019

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Display of a simulated HL-LHC collision event in an upgraded ATLAS detector. The event has an average of 200 collisions per particle bunch crossing. (Image: ATLAS Collaboration/CERN)

The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) is scheduled to begin colliding protons in 2026. This major improvement to CERN’s flagship accelerator will increase the total number of collisions in the ATLAS experiment by a factor of 10. To cope with this increase, ATLAS is preparing a complex series of upgrades including the installation of new detectors using state-of-the-art technology, the replacement of ageing electronics, and the upgrade of its trigger and data acquisition system.

What discovery opportunities will be in reach for ATLAS with the HL-LHC upgrade? How precisely will physicists be able to measure properties of the Higgs boson? How deeply will they be able to probe Standard Model processes for signs of new physics? The ATLAS Collaboration has carried out and released dozens of studies to answer these questions – the results of which have been valuable input to discussions held this week at the Symposium on the European Strategy for Particle Physics, in Granada, Spain.

“Studying the discovery potential of the HL-LHC was a fascinating task associated with the ATLAS upgrades,” says Simone Pagan Griso, ATLAS Upgrade Physics Group co-convener­. “The results are informative not only to the ATLAS Collaboration but to the entire global particle-physics community, as they reappraise the opportunities and challenges that lie ahead of us.” Indeed, these studies set important benchmarks for forthcoming generations of particle physics experiments.

Pagan Griso worked with Leandro Nisati, the ATLAS representative on the HL-LHC Physics Potential ‘Yellow Report’ steering committee, and fellow ATLAS Upgrade Physics Group co-convener, Sarah Demers, to coordinate these studies for the collaboration. “A CERN Yellow Report, with publication in its final form forthcoming, will combine ATLAS’ results with those from other LHC experiments, as well as input from theoretical physicists,” says Nisati.

Estimating the performance of a machine that has not yet been built, which will operate under circumstances that have never been confronted, was a complex task for the ATLAS team. “We took two parallel approaches,” explains Demers. “For one set of analysis projections, we began with simulations of the challenging HL-LHC experimental conditions. These simulated physics events were then passed through custom software to show us how the particles would interact with an upgraded ATLAS detector. We then developed new algorithms to try to pick the physics signals from the challenging amount of background events.” Dealing with abundant background will be a common complication for HL-LHC operation.

See the full article here .


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