26th Australian Institute of Physics Congress and the Australian and New Zealand Conference on Optics and Photonics

Session

AIP NUPP: High-energy collider physics 2

NUPP

10 Dec 2026, 16:30

Belinda Hutchinson Building (The University of Sydney )

336. New results from the Run 3 data taking period of the ATLAS experiment

Prof. Paul Jackson (University of Adelaide)

10/12/2026, 16:30

AIP | Nuclear and Particle Physics (NUPP)

Invited talk

In June 2026, the Large Hadron Collider (LHC) at CERN was shutdown, bringing the curtain down on the highly successful Run 3 period of the machine which started in 2022. In this talk, I will survey some of the results already produced using these data from top physics, Higgs results and searches for physics beyond the Standard Model. By 2030, the LHC will be reimagined as the high-luminosity...

529. Trigger-Level Anomaly Detection at the ATLAS Experiment

Haylea Isobel Purnell (Adelaide University (AU))

10/12/2026, 17:00

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

The ATLAS Experiment’s trigger system works in real-time to accept interesting events with specific energies and structures, motivated by known physics models. While this traditional method has allowed for world-leading datasets and breakthroughs such as the discovery of the Higgs boson, this model-dependence might risk excluding unanticipated new physics that doesn’t fit our current trigger...

785. Search for new resonances in final states with three or four top quarks with the ATLAS experiment

Harish Potti (University of Sydney (AU))

10/12/2026, 17:15

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

Many new physics theories predict the existence of heavy, top-philic resonances that couple exclusively to Standard Model top quarks. These hypothetical particles can be probed only by searching for events with three or four top quarks in the final state. In this talk, we will present the latest results from the ATLAS search for these new resonances performed using the full Run 2 dataset...

472. Estimating the Number of Fake Leptons in a 3 Lepton and Missing Transverse Momentum SUSY Electro-weakino search at the ATLAS detector

Kael Kemp (University of Adelaide (AU))

10/12/2026, 17:30

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

When examining collision events in particle collider experiments such as the ATLAS experiment at CERN, it is important to understand all processes that can give rise to a specific final state. This is often performed by studying Monte Carlo generated events to model Standard Model processes. We can model the hard scattering processes, but it is also important to consider the detector...

396. Graph Neural Networks for Calorimeter-Based Cluster Calibration at the ATLAS Experiment

Matthew Green (Adelaide University (AU))

10/12/2026, 17:45

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

The ATLAS detector at the Large Hadron Collider measures the energy of particles using calorimeters. These are volumes segmented into many individual cells, each recording a small deposit of energy as a particle passes through. The cell-by-cell structure has a natural geometric and topological form which is well suited to graph neural networks (GNNs), a class of machine learning models...