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HK: Fachverband Physik der Hadronen und Kerne

HK 8: Hadron Structure and Spectroscopy II

HK 8.2: Vortrag

Montag, 26. Februar 2018, 17:00–17:15, HZO 50

Nucleon resonance spectroscopy via meson-pair decay* — •Mariana Nanova for the CBELSA/TAPS collaboration — II. Physikalisches Institut, Justus-Liebig-Universität Gießen

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. We 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. Dalitz plots show a clear evidence for various baryon resonances populated in the decay of higher lying nucleon resonances. Preliminary results on studying a narrow resonance-like structure, claimed by other experiments, will be presented.

[1] E. Klempt and J.-M. Richard, Rev. Mod. Phys. 82 (2010) 1095

*Supported by DFG through SFB/TR16.