Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 30: Hadron Structure and Spectroscopy V

HK 30.5: Vortrag

Mittwoch, 28. Februar 2018, 15:15–15:30, HZO 50

Extended freed-isobar PWA at Compass — •Fabian Michael Krinner for the COMPASS collaboration — Technische Universität München

Compass is a multi-purpose two-stage spectrometer that constitutes the longest-running experiment at the CERN SPS at the moment. One of the primary goals of the experiment is to study the spectrum of light mesons. The flagship channel for this kind of analysis is the diffractive process π⁻p→π⁻π⁺π⁻p, for which Compass has collected a sample of 46×10⁶ events.

In order to extract 3π resonances from these data, a partial-wave analysis is performed. This analysis is based on the isobar model and relies on the complete knowledge of the dynamic amplitudes of the π⁺π⁻ resonances (isobars) that appear in the subsystems. In order to reduce the model-dependence that is introduced by the employed fixed parameterizations of the isobar amplitudes, we developed a novel method, the freed-isobar PWA, which allows to extract the dynamic isobar amplitudes directly from the data. We will discuss results obtained for waves with J^PC=3⁺⁺ and 4⁺⁺.

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