Roper resonance-Its static and dynamic properties from single- and double-pion production

T. Skorodko, M. Bashkanov, H. Clement*, E. Doroshkevich, O. Khakimova, F. Kren, G. J. Wagner

*Corresponding author for this work

Research output: Contribution to journalShort surveypeer-review


In most investigations the Roper resonance is sensed only very indirectly via complex partial wave analyses. We find indications for its excitation in the p p → n p π+ reaction, where some resonance-like structure is observed in the invariant n π+ mass spectrum at M ≈ 1360 MeV with a width of 150 MeV. The values fit very favorably to the most recent phase shift results as well as to the observations at BES. In near-threshold two-pion production p p → p p π0 π0 the Roper excitation and its subsequent decay into N π π is the only dominant process. There we find its decay into the N σ channel as the dominating decay process - in favor of a monopole nature of the Roper excitation.

Original languageEnglish
Pages (from-to)168-169
Number of pages2
JournalProgress in Particle and Nuclear Physics
Issue number1
Publication statusPublished - 1 Jul 2008


  • Decay properties
  • Monopole nature
  • Roper resonance

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