Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Hadron Structure and Spectroscopy VI

HK 49.3: Vortrag

Donnerstag, 13. März 2025, 16:30–16:45, HS 3 Physik

Precision Tests of the Chiral Anomaly at the COMPASS Experiment — •Andrii Maltsev — Technische Universität München

Quantum chromodynamics (QCD) has been extremely successful in describing hadron interactions at high energies. At low energies, it becomes challenging to obtain quantitative predictions from first principles. However, one can exploit the chiral symmetry, a fundamental property of QCD, to build phenomenological models, such as the chiral perturbation theory, which give a perturbative framework for describing low-energy processes. Verification of the predictions of these models is crucial for understanding the low-energy interactions of hadrons.

This talk will give an overview of the processes that can be predicted using chiral perturbation theory, such as the πγ → ππ, πγ → πη, Kγ → Kπ processes, with special emphasis on the status of the measurement of the πγ → ππ coupling constant, F_3π.

Keywords: chiral anomaly; chiral perturbation theory; cross section measurement; experimental tests of chiral anomaly; COMPASS experiment