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arXiv · 1506.00557

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

H. Clement·M. Bashkanov·T. Skorodko
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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 $ΔΔ$ system. New neutron-proton scattering data, taken with polarized beam at COSY, produce a pole in the coupled $^3D_3$ - $^3G_3$ partial waves at ($2380\pm10~-~i~40\pm5$) MeV establishing thus the first observation of a genuine $s$-channel dibaryon resonance.

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H. Clement, M. Bashkanov, T. Skorodko. 2015-06-01. From CELSIUS to COSY: on the observation of a dibaryon resonance. https://doi.org/10.1088/0031-8949%2F2015%2Ft166%2F014016

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