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-at-COSY for the fusion reactions leading to d, (3)He and (4)He. They all reveal this effect to be of isoscalar nature and associated with a narrow Lorentzian-shaped structure in the total cross section. The latter could point to the formation of an isoscalar resonance, which couples to the pn channel as well as to an intermediate Delta Delta state.
| Original language | English |
|---|---|
| Pages (from-to) | 627-629 |
| Number of pages | 3 |
| Journal | International Journal of Modern Physics A |
| Volume | 26 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 10 Feb 2011 |
| Event | 11th International Workshop on Meson Production, Properties and Interaction - Krakow, Poland Duration: 10 Jun 2010 → 15 Jun 2010 |
Keywords / Materials (for Non-textual outputs)
- ABC effect
- Delta Delta excitation
- pn channel
- PROTON-PROTON COLLISIONS
- EXCLUSIVE MEASUREMENTS
- 2-PION PRODUCTION