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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Hadron Structure and Spectroscopy IV
HK 25.5: Talk
Tuesday, March 12, 2024, 18:45–19:00, HBR 14: HS 1
The Chiral Anomaly in πγ→πη Scattering at COMPASS* — •Andrii Maltsev for the COMPASS collaboration — Technische Universität München
Quantum chromodynamics (QCD) has been extremely successful in desribing hadron interactions at high energies. However, at low energies it is no longer possible to apply the standard perturbative series in the strong coupling constant αs. Using the chiral symmetry, a fundamental property of QCD, phenomenological models, such as the chiral perturbation theory (χPT), have been developed that are able to describe low-energy processes. Testing the predictions of such models, such as the πγ → ππ, πγ→ηπ couplings, is important for understanding the low-energy interactions of hadrons.
In this talk, the status of the measurement of the Fηππγ constant, which is predicted by χPT and describes the anomalous vertex πγ→ηπ, in the COMPASS experiment will be presented, as well as the comparison with the previous measurement.
* funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 390783311 and BMBF Verbundforschung 05P21WOCC1 COMPASS.
Keywords: COMPASS; chiral anomaly; chiral perturbation theory; Primakoff