Abstract
A short overview over the ABC phenomenon is given, which is known since 50 years without any satisfactory explanation On the basis of new exclusive and kinematically complete data obtained with the WASA detector at COSY we show that this phenomenon is linked with a resonant energy dependence in the total cross section of isoscalar double-pionic fusion processes This resonance structure is connected with the baryon-baryon system, in particular with the pn and Delta Delta systems, however, has a mass, which is 90 MeV below the nominal Delta Delta threshold and a width of only 70 MeV, i e five times smaller than expected from a conventional t-channel Delta Delta scenario
Original language | English |
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Pages (from-to) | 1339-1341 |
Number of pages | 3 |
Journal | Chinese Physics C |
Volume | 34 |
Issue number | 9 |
Publication status | Published - 1 Sept 2010 |
Event | 5th International Conference on Quarks and Nuclear Physics (QNP09) - Beijing Duration: 21 Sept 2009 → 25 Sept 2009 |
Keywords / Materials (for Non-textual outputs)
- ABC effect
- baryon-baryon resonance
- double-pionic fusion
- isoscalar resonance
- PROTON-PROTON COLLISIONS
- PI-PI INTERACTION
- 2-PION PRODUCTION
- ROPER RESONANCE
- EXCLUSIVE MEASUREMENTS
- CROSS-SECTIONS
- SINGLE-PION
- S-WAVE
- GEV-C
- ENHANCEMENT