Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Hadron Structure and Spectroscopy VIII

HK 43.3: Talk

Wednesday, March 30, 2022, 14:45–15:00, HK-H9

Testing the Chiral Anomaly from Primakoff Reactions in COMPASS Data — •Nan-Hee Kang and Dominik Ecker for the COMPASS collaboration — Institute for Hadronic Structure and Fundamental Symmetries, Technische Universität München

In the years 2009 and 2012, the COMPASS collaboration at CERN has measured pion-photon scattering reactions via the Primakoff effect. In these reactions, high-energetic pions scatter off quasi-real photons stemming from the Coulomb field of a nucleus. The low-energy dynamics of the single-π⁰ production (π⁻γ^(*)→π⁻π⁰) is driven by the chiral anomaly and described by the low-energy theorem for F_3π. Previous extractions of the chiral anomaly date back to the Serpukhov experiment in 1987, are restricted to the kinematic threshold region, and extracted F_3π to a 10%-level. COMPASS measured the invariant mass spectrum including the ρ(770)-resonance which allows for more precise extraction of F_3π. The contribution will present the status of the analysis of the 2009 data set and compare its kinematic distributions to the larger 2012 data set.