Abstract / Description of output
The ABC effect - an intriguing low-mass enhancement in the pi pi invariant mass spectrum - is known from inclusive measurements of two-pion production in nuclear fusion reactions. Exclusive measurements have been carried out at CELSIUS/WASA and WASA@COSY for the fusion reactions leading to d, (3)He and (4)He. They all reveal this effect to be a sigma channel phenomenon combined with a resonance-like behavior in the total cross section. The latter points to the formation of an isoscalar dibaryonic resonance, which couples to the pn channel as well as to a Delta Delta intermediate state.
| Original language | English |
|---|---|
| Pages (from-to) | 255-262 |
| Number of pages | 8 |
| Journal | International Journal of Modern Physics A |
| Volume | 24 |
| Issue number | 2-3 |
| Publication status | Published - 30 Jan 2009 |
| Event | Conference MESON 2008 - Cracow, Poland Duration: 6 Jun 2008 → 10 Jun 2008 |
Keywords / Materials (for Non-textual outputs)
- ABC effect
- Delta Delta excitation
- pn channel
- sigma channel
- dibaryon resonance
- GEV-C
- CROSS-SECTIONS
- S-WAVE
- ENHANCEMENT
- RESONANCE
- MODEL