Measurements of the Chiral Anomaly in Primakoff processes involving pions, η mesons, and kaons in the COMPASS Experiment

by Andrii Maltsev

Thursday 15 Jan 2026, 09:30 → 10:30 Europe/Berlin

E18/ENE Seminar Room 3268 (TUM PH)

The Quantum Chromodynamics, which is widely considered to be the underlying theory of strong interactions, has limitations in terms of describing low-energy hadron interactions using the standard perturbative approach. Instead, we can exploit the fundamental property of QCD, the chiral symmetry, to build effective field theories, that allow to give quantitative predictions for the low-energy processes.

This talk will focus on testing the predictions on one of such models, the Chiral Perturbation Theory, combined with the dispersive approach, for the processes involving pseudoscalar mesons, such as the πγ → ππ, πγ → πη, Kγ → Kπ couplings arising as a consequence of the chiral anomaly, which are important for understanding the low-energy interactions of hadrons.

The key differences in analyzing these processes will be discussed, as well as the status and the future steps in the analyses.