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HK: Fachverband Physik der Hadronen und Kerne

HK 62: Invited Talks III

HK 62.2: Hauptvortrag

Freitag, 14. März 2025, 11:30–12:00, Kurt-Alder HS Chemie

Overview of the BGOOD experiment at ELSA, Bonn — •Rachele Di Salvo for the BGOOD collaboration — I.N.F.N., Sezione di Roma Tor Vergata

The BGOOD experiment at the ELSA facility combines a forward spectrometer and a large solid angle central calorimeter, thus providing a hermetic coverage and a unique tool for the detection of both charged and neutral particles. The experiment, complementary to other setups working in the same physics sector, allows a systematic investigation of the nucleon excitation spectrum and the search for the so-called missing resonances, via strange and non-strange meson photoproduction. In the last years focus has been put also on the investigation of unconventional multi-quark states in the (hidden-)strange sector, in analogy to what happens in the (hidden-)charm one, where states interpreted as penta- and tetraquarks have been found. For the investigation of such loosely bound meson-baryon molecular systems, the opportunity (provided by the BGOOD apparatus) to access the low momentum transfer region, where the meson is detected at very forward angles, is crucial. I will give a short overview of the main results obtained at this experiment in the recent years.

Keywords: meson photoproduction; baryon resonances; missing resonances; (hidden) strange sector; molecular loosely bound states