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IOP Joint APP and HEPP Annual Conference 2025

7–9 Apr 2025
Cavendish Laboratory, University of Cambridge
Europe/London timezone

Session

Collider Physics - QCD

7 Apr 2025, 16:00
Cavendish Laboratory, University of Cambridge

Cavendish Laboratory, University of Cambridge

J J Thomson Avenue Cambridge CB3 0HE UK

Conveners

Collider Physics - QCD: 1

  • Matteo Agostini

Description

This track is dedicated to QCD in the high-energy regime, focusing on parton distributions, hadronisation, jet physics, strong dynamics, and lattice calculations.

Presentation materials

There are no materials yet.

  1. 109. Centrality Dependence of Global and Azimuthal of Λ Hyperon Polarization In heavy-ion collisions
    Sahr Alzhrani
    07/04/2025, 16:00
    Collider Physics - QCD
    Parallel talk

    Using a (3+1)D hydrodynamic model, we analyze Λ hyperon polarization in heavy-ion collisions at √sNN = 200 GeV, revealing a strong dependence on initial conditions and QGP viscosity. The model accurately reproduces hadronic flow observables and predicts higher-order azimuthal oscillations in longitudinal polarization. Novel correlations between polarization and anisotropic flow are proposed,...

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  2. 29. Probing the Dead Cone Effect in b-Jet Substructure Using the Lund Jet Plane and Graph Neural Network Track Origin Tagging in ttbar Events with the ATLAS Detector
    Hanfei Cui (University College London)
    07/04/2025, 16:15
    Collider Physics - QCD
    Parallel talk

    This study measures the Lund jet plane and the dead cone effect in b-jets from single-leptonic and di-leptonic $t\bar{t}$ events. Using the Cambridge/Aachen algorithm for jet reclustering, we look for suppressed emissions at small angles indicative of the dead cone effect. We employ a novel graph neural network based jet flavour tagger (GN2) that labels over 80% of b-hadron decay tracks via...

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  3. 93. Quarkonium Parton Showe in Herwig 7
    Aidin Masouminia (IPPP, Durham University)
    07/04/2025, 16:30
    Collider Physics - QCD
    Parallel talk

    I will discuss the implementation of quarkonium parton shower and decay in Herwig 7, integrating non-relativistic QCD factorisation with spin-colour projections. Both colour-singlet and colour-octet channels are included, capturing S- and P-wave states and feed-down effects from higher excitations. The wavefunction formalism at small quark–antiquark separations is matched to short-distance...

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  4. 3. Measuring the production of $D^{*}$ mesons within jets at the ATLAS experiment
    Eric Liu (University of Birmingham (GB))
    07/04/2025, 16:45
    Collider Physics - QCD
    Parallel talk

    Charm quark fragmentation functions describe the probability of charm quarks hadronising into particular charm hadrons. Understanding such functions will provide valuable data for studies involving charm hadrons, such as the development of flavour tagging algorithms and MC event generators. This talk will discuss the approach to the measurement of the charm fragmentation function by analysing...

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