München 2019 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy V

HK 33.2: Group Report

Wednesday, March 20, 2019, 14:30–15:00, HS 13

Strangeness photoproduction at the BGO-OD experiment — •Thomas Jude for the BGO-OD collaboration — Physikalisches Institut, Bonn University

Hadron spectroscopy has for many years been used to explore the relevant internal degrees of freedom of the nucleon. Despite the wealth of data there remain many "missing resonances" which are predicted by quark models but are not observed experimentally. Since the conception these models, there has been discussion of the possibility of baryons and mesons of more than three and two constituent quarks respectively. These could manifest as single colour bound objects, or evolve from meson-baryon and meson-meson interactions, opening a possibility of molecular systems and meson re-scattering effects near production thresholds. Indeed, models including meson-baryon interactions have had improved success in describing both strange and non-strange resonance spectra.

To study such effects experimentally, access to a low momentum exchange region is crucial. The BGO-OD experiment at ELSA, comprised of a forward spectrometer and central calorimeter, is uniquely suited for the study of strangeness photoproduction in this region of forward meson angles. First promising results exhibit unprecedented statistics for the associated photoproduction of charged kaons with both ground state and excited hyperons, and neutral kaons identified via both neutral and charged decay modes.

Supported by the DFG PN 50165297.