München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VII

HK 47.2: Vortrag

Donnerstag, 21. März 2019, 14:30–14:45, HS 13

Cascading decays of nucleon resonances via meson-pair emission — •Mariana Nanova and Volker Metag for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Giessen, Giessen, Germany

Photoproduction of mesons provides important information about the excitation spectrum of the nucleon that is still not sufficiently understood despite various long-lasting experimental and theoretical efforts [1]. Reactions with multiple-meson final states are important, in particular π⁰η since the η acts as an isospin filter and provides information on the nature of the intermediate resonances. Particular attention has been paid to the recently claimed narrow structure observed at 1685 MeV in the Nπη channel [2]. We have studied the two-meson photoproduction with the CB/TAPS detector system at the ELSA accelerator in Bonn in the reaction γp→ pπ⁰η. High statistics have been obtained in irradiating a liquid hydrogen target with photon beams in the incident energy range from 0.9 to 3.0 GeV. A kinematic fit has been used in the reconstruction and identification of the exit channels. Preliminary results on the search for the narrow structure at 1685 MeV will be presented.
V. Crede and W. Roberts, Rep. Prog. Phys. 76 (2013) 076301
V. Kuznetsov et al., JETP Letters 106 (2017) 693
^∗Supported by DFG through SFB/TR16.