科研之友
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摘要
We investigate the basic 2 pi-fusion reaction pn -> d + (pi pi)(0) in the energy region T (p) = 1-1.4GeV within the framework of a model based on a D (03)-dibaryon production and its subsequent decay via two interfering routes: through an intermediate sigma meson and through an isovector dibaryon D (12). We demonstrate that the constructive interference of the above two mechanisms gives a strong near-threshold enhancement in the pi pi invariant-mass spectrum, i.e., the so-called ABC effect. It is shown that the sigma-meson emission from the D (03) dibaryon plays a crucial role in reproducing the shape and position of the ABC enhancement and is tightly related to the idea of chiral symmetry restoration in dense and excited hadronic systems, such as the D (03) state.
- 出版日期2014-8
