DOUBLE-PION PRODUCTION IN NUCLEON COLLISIONS ON FEW-BODY SYSTEMS - THE ABC EFFECT AND ITS POSSIBLE ORIGIN

Mikhail Bashkanov*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 languageEnglish
Pages (from-to)255-262
Number of pages8
JournalInternational Journal of Modern Physics A
Volume24
Issue number2-3
Publication statusPublished - 30 Jan 2009
EventConference MESON 2008 - Cracow, Poland
Duration: 6 Jun 200810 Jun 2008

Keywords

  • ABC effect
  • Delta Delta excitation
  • pn channel
  • sigma channel
  • dibaryon resonance
  • GEV-C
  • CROSS-SECTIONS
  • S-WAVE
  • ENHANCEMENT
  • RESONANCE
  • MODEL

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