Study of Few-Body Problems at WASA - the ABC Phenomenon

WASA-At-COSY Collaboration, M. Bashkanov*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A short overview over the ongoing few-body program at WASA@COSY is given with special emphasis on the ABC phenomenon, which is known since 50 years without having found a consistent explanation. 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, possesses a mass, which is 90 MeV below the nominal Delta Delta threshold and has a width of only 50 MeV, i.e., five times smaller than expected from a conventional t-channel Delta Delta process.

Original languageEnglish
Title of host publication19TH INTERNATIONAL IUPAP CONFERENCE ON FEW-BODY PROBLEMS IN PHYSICS
EditorsE Eplelbaum, HW Hammer, UG Meibner
PublisherE D P SCIENCES
Number of pages3
DOIs
Publication statusPublished - 12 Apr 2010
Event19th International IUPAP Conference on Few-Body Problems in Physics - Bonn, Germany
Duration: 31 Aug 20095 Sep 2009

Publication series

NameEPJ Web of Conferences
PublisherE D P SCIENCES
Volume3
ISSN (Print)2100-014X

Conference

Conference19th International IUPAP Conference on Few-Body Problems in Physics
Country/TerritoryGermany
CityBonn
Period31/08/095/09/09

Keywords

  • DOUBLE-PION PRODUCTION
  • ROPER RESONANCE
  • GEV-C
  • NUCLEON COLLISIONS
  • 2-PION PRODUCTION
  • CROSS-SECTIONS
  • SINGLE-PION
  • S-WAVE
  • ENHANCEMENT
  • EXCITATION

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