Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.12: Poster

Tuesday, March 28, 2017, 16:45–18:45, F Foyer

Study of the Primakoff reaction π⁻ + γ → π⁻ + π⁰ at COMPASS — •Julian Seyfried — TU München, Deutschland

The COMPASS experiment at CERN has measured pion-photon scattering reactions via the Primakoff effect. In these reactions, high-energetic pions scatter off virtual photons from the Coulomb field of nuclei with high atomic number. To separate Primakoff reactions from background induced by the strong interaction, a high resolution of the squared four-momentum transfer to the nucleus is essential. This places tight requirements on the accuracy of the Monte Carlo simulation and the reconstruction of the reaction. In 2012, COMPASS has recorded a large Primakoff data sample with an optimized detector setup. This sample contains the reaction π⁻+γ→π⁻+ π⁰. We will present first results from an analysis of this reaction, which offers the possibility to measure the chiral anomaly.

This work was supported by the BMBF, the DFG Cluster of Excellence "Origin and Structure of the Universe" (Exc 153), the Maier-Leibnitz-Laboratorium der Universität und der Technischen Universität München.