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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadron Structure and Spectroscopy VII

HK 37.3: Talk

Thursday, March 19, 2026, 17:00–17:15, PHIL C 301

Measurement of the chiral anomaly at COMPASS — •Jan Friedrich for the COMPASS collaboration — Physik-Department, Technische Universität München, Garching

Using the Primakoff technique for 190 GeV pions on nuclear targets, we have determined the chiral anomaly in the process π γ → π π⁰ with unprecedented precision. We report on the challenges of background subtraction, radiative corrections and the luminosity determination.

Keywords: pion structure; COMPASS; Primakoff reactions; chiral symmetry