Study of the p p -> p p pi+ pi- Reaction in the Low-Energy Tail of the Roper Resonance

Abstract

Exclusive measurements of the p p -> p p pi+ pi- reaction have been carried out at Tp = 775 MeV at CELSIUS using the PROMICE/WASA setup. Together with data obtained at lower energy they point to a dominance of the Roper excitation in this process. From the observed interference of its decay routes N* -> N sigma and N* -> Delta pi -> N sigma their energy-dependent relative branching ratio is determined.

References in corpus (4)

• What is the structure of the Roper resonance?
• Nucleon-nucleon elastic scattering analysis to 2.5 GeV
• Theoretical study of the N N --> N N pi pi reaction
• The two pion decay of the Roper resonance

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