ProjectDi-Baryon-System – Untersuchung von Resonanzen im Di-Baryon-System anhand von Daten zur Multi-Pionenproduktion und…

Basic data

Untersuchung von Resonanzen im Di-Baryon-System anhand von Daten zur Multi-Pionenproduktion und Neutron-Proton-Streuung
01/03/2019 to 28/02/2021
Abstract / short description:
In this project candidates for resonances in the system of two baryons shall be investigated. Starting point is that we have found a resonance structure with isospin-spin-parity I(JP)=0(3+) in the double-pionic fusion to deuterium, which is tightly correlated with the so-called ABC effect known since decades. This structure appears at 2.37 GeV, i.e. about 90 MeV below the DeltaDelta threshold with a width of about 70 MeV, i.e. roughly three times narrower than a conventional DeltaDelta excitation via t-channel meson exchange. Since the previous application we succeeded to reveal the resonance structure in all NNpipi channels as well as in neutron-proton scattering with help of WASA data (except of nppi+pi-) With regard to the np scattering our data for the analyzing power in the resonance region have been shown to produce a resonance pole in the SAID partial-wave analysis in the 3D3-3G3 coupled partial waves. This means that the observed resonance structure is a true s-channel resonance. Aim is the analysis of WASA data to extract differential cross sections for np scattering as well as for the nppi+pi- channel in the resonance region, further-on to trace electromagnetic decay channels of the resonance and finally to search for a predicted NN-decoupled state in the region of the DeltaN threshold.

Involved staff


Institute of Physics (PIT)
Department of Physics, Faculty of Science

Local organizational units

Institute of Physics (PIT)
Department of Physics
Faculty of Science


Bonn, Nordrhein-Westfalen, Germany

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