Mainz 2022 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 9: Hadron Structure and Spectroscopy I
HK 9.1: Gruppenbericht
Montag, 28. März 2022, 14:00–14:30, HK-H8
Investigation of the Σ0 production mechanism in p(3.5 GeV)+p collisions at HADES experiment — •Waleed Esmail1,2 and James Ritman1,2,3 for the HADES collaboration — 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 2Forschungszentrum Jülich, 52428 Jülich, Germany — 3Ruhr-Universität Bochum, 44801 Bochum, Germany
The production of hyperons serves as a tool to investigate the strong interaction in the non-perturbative energy regime. This talk presents a study of the Σ0 production mechanism via the exclusive reaction pp → pK+Σ0 at a beam kinetic energy 3.5 GeV with the HADES detector. The dynamics of the reaction pp → pK+Σ0 was investigated by studying the angular distributions in the CMS, Gottfried-Jackson and helicity frames. The angular distributions in the CMS frame supports the pion exchange mechanism. Furthermore, the helicity angular distributions are highly non-isotropic, which is a clear indication that there is a resonant component of the Σ0 production. In order to provide a better description of the experimental angular distributions, the Bonn-Gatchina Partial Wave Analysis (Bo-Ga PWA) has been employed. However, due to the insufficient statistics, it was not possible to obtain an unambiguous determination of the relative contribution of each intermediate nucleon resonance to the overall final state. Nevertheless, significant contributions of nucleon resonances N*(1710) (JP=1/2+), N*(1900) (JP=3/2+) and Δ*(1900) (JP=1/2−) are certainly preferred by the PWA fit.