From CELSIUS to COSY: on the observation of a dibaryon resonance

Abstract

Using the high-quality beam of storage rings in combination with a pellet target and the hermetic WASA detector covering practically the full solid angle the two-pion production in nucleon-nucleon collisions has been systematically studied by exclusive and kinematically complete measurements -- first at CELSIUS and subsequently at COSY. These measurements resulted in a detailed understanding of the two-pion production mechanism by $t$-channel meson exchange. The investigation of the ABC effect in double-pionic fusion reactions lead the trace to the observation of a narrow dibaryon resonance with $I(J^P)=0(3^{+})$ about 80 MeV below the nominal mass of the conventional $\Delta \Delta$ system. New neutron-proton scattering data, taken with polarized beam at COSY, produce a pole in the coupled ${}^3{D}_3$ - ${}^3{G}_3$ partial waves at ($2380\pm 10-i40\pm 5$) MeV establishing thus the first observation of a genuine $s$-channel dibaryon resonance.

References in corpus (10)

• ABC Effect in Basic Double-Pionic Fusion --- Observation of a new resonance?
• Double-Pionic Fusion of Nuclear Systems and the ABCEffect -- Aproaching a Puzzle by Exclusive and Kinematically Complete Measurements
• Evidence for a New Resonance from Polarized Neutron-Proton Scattering
• The WASA Detector Facility at CELSIUS
• Three-body model calculations of Nucleon-Delta and Delta-Delta dibaryon resonances
• Dynamical calculation of the $\Delta \Delta$ dibaryon candidates
• Neutron-Proton Scattering in the Context of the $d^{\ast }$(2380) Resonance
• Two-Pion Production in Proton-Proton Collisions -- Experimental Total Cross Sections and their Isospin Decomposition
• Two-Pion Production in Proton-Proton Collisions with Polarized Beam
• Delta Delta Excitation in Proton-Proton Induced pi0pi0 Production

Cited by in corpus (5)

• Dibaryons: Molecular versus Compact Hexaquarks
• On the width of N-Delta and Delta-Delta states
• An Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction?
• Differential Cross Sections for Neutron-Proton Scattering in the Region of the $d^{\ast }(2380)$ Dibaryon Resonance
• On the Production of an Isotensor Dibaryon in the $pp\to pp{\pi }^{+}{\pi }^{-}$ Reaction