Abstract / Description of output
Recently it has been shown by exclusive and kinematically complete experiments that the appearance of a narrow resonance structure in double-pionic fusion reactions is strictly correlated with the appearance of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the pi pi-invariant mass spectrum. Whereas the resonance structure got its explanation by the d* (2380) dibaryonic resonance, a satisfactory explanation for the ABC effect is still pending. In this paper we discuss possible explanations of the ABC effect and their consequences for the internal structure of the d* dibaryon. To this end we examine and review a variety of proposed explanations for the ABC effect, add a new hypothesis and confront all of them with the experimental results for the np -> d pi(0)pi(0) and np -> np pi(0)pi(0) reactions, which are the most challenging ones for this topic. (C) 2016 Elsevier B.V. All rights reserved.
Original language | English |
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Pages (from-to) | 129-146 |
Number of pages | 18 |
Journal | Nuclear Physics A |
Volume | 958 |
DOIs | |
Publication status | Published - 6 Dec 2016 |
Keywords / Materials (for Non-textual outputs)
- ABC effect
- Dibaryon resonance
- PROTON-PROTON COLLISIONS
- TOTAL CROSS-SECTIONS
- PION-PRODUCTION
- GEV-C
- ISOSPIN DECOMPOSITION
- DIBARYON RESONANCES
- 2-PION PRODUCTION
- BROAD DIBARYONS
- DELTA
- MODEL