Investigation of Resonances in the Di-Baryon System by Means of Data for Multi-Pion Production and Neutron-Proton Scattering

• Applicant: Professor Dr. Heinz Clement
• Subject Area: Nuclear and Elementary Particle Physics, Quantum Mechanics, Relativity, Fields
• Term: from 2014 to 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 258030570

In this project candidates for resonances in the system of two baryons shall be investigated. Starting point has been our observation of a resonance structure with isospin-spin-parity I(JP) = 0(3+) in the dpi0pi0 channel, 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 only about 70 MeV. Since our first application we succeeded to reveal the resonance structure in all NNpipi channels as well as in neutron-proton scattering with help of WASA data, reveal its resonance pole in the 3D3 partial wave and thus prove it as a true s-channel resonance, since then called d*(2380). Further-on we could demonstrate that the non-observation of a decay into NNpi as well as the ABC effect favor this state to be a deeply bound DeltaDelta state (compact hexaquark system). In addition we have found evidence for the existence of a isotensor DeltaN state, D21. Aim of this continuation application is the analysis of WASA data to extract electromagnetic decay channels of d*(2380), which provide further information about the structure of this state, and finally to render more precisely the search for a predicted NN-decoupled state with I=3, as well as to look for consistency reasons also for the associated production of D12 in NNpipi systems.

• DFG Programme: Research Grants
• International Connection: United Kingdom
• Cooperation Partner: Privatdozent Dr. Mikhail Bashkanov