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

Session

AIP NUPP: High-energy collider physics 3

NUPP

11 Dec 2026, 09:00

Belinda Hutchinson Building (The University of Sydney )

216. Top quarks at hadron colliders: everything all at once

Peter Skands (Monash University (AU))

11/12/2026, 09:00

AIP | Nuclear and Particle Physics (NUPP)

Invited talk

High-energy collider events involving the production and decays of top quarks present a unique and formidable combination of theoretically challenging physics effects: final states with large numbers of jets, heavy-quark fragmentation, sequential resonance decays with GeV-scale widths, and non-trivial confinement effects exacerbated by the top quarks themselves carrying QCD colour charges....

407. Discriminating Four-Top Production with Recursive Jigsaw Reconstruction at the ATLAS Experiment

James Gallagher (University of Adelaide (AU))

11/12/2026, 09:30

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

The simultaneous production of four top-quarks (four-top) is a rare physics process predicted by the Standard Model, suspected to be sensitive to Beyond Standard Model (BSM) effects. If these BSM contributions were to exist, their effects would manifest in the form of an amplified cross section and enhanced yield of four-top, and in [2021][1] and [2023][2], four-top excess was repeatedly...

360. Joint hadronization of heavy quarks in proton-proton collisions

Gleb Chizhik (Monash University (AU))

11/12/2026, 09:45

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

The bottom and charm quarks are the heaviest quarks which can build hadrons and they have several unique characteristics. Due to their heavy mass, production occur in the hard scattering or the early stages of the parton evolution of a proton-proton collision. Heavy-light meson production (like a $B^+$) is dominated by the heavy parent radiating gluons which form quark pairs, or by additional...

245. Effect of Closepacking on High-energy Interactions for Dipole strings with Nearby Axes (ECHIDNA)

Claire Bergman

11/12/2026, 10:00

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

String closepacking refers to the assumption that a system of multiple simultaneously fragmenting QCD strings can be described in terms of individual Lund strings fragmenting on an effective background created by other strings. The implementation of this idea in the Pythia event generator has had some success in describing observed strangeness-enhancement effects in high-multiplicity...

698. Building foundation models with low-level collision data in particle physics

Shreya Saha (University of Adelaide (AU))

11/12/2026, 10:15

AIP | Nuclear and Particle Physics (NUPP)

Contributed Oral

The integration of foundation models in particle physics is gaining pace rapidly and has expanded the search for new physics. This talk presents foundation models trained on low-level data from the first fully simulated dataset using Open Data Detector (ColliderML), to distinguish between Standard Model and Beyond Standard Model processes. We compare new physics discovery using only low level...