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From CELSIUS to COSY: on the observation of a dibaryon resonance
📝 Description
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 $^3D_3$ - $^3G_3$ partial waves at ($2380\pm10~-~i~40\pm5$) MeV establishing thus the first observation of a genuine $s$-channel dibaryon resonance.
✍️ Author
H. Clement
Clement of Rome (Latin: Clemens Romanus; Ancient Greek: Κλήμης Ῥώμης, romanized: Klēmēs Rōmēs; died c. 100), also known as Pope Clement I, was the Bishop of Rome in the late first century.
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