Examination of the nature of the ABC effect

M. Bashkanov*, H. Clement, T. Skorodko

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 languageEnglish
Pages (from-to)129-146
Number of pages18
JournalNuclear Physics A
Volume958
DOIs
Publication statusPublished - 6 Dec 2016

Keywords

  • 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

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