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

✍ Scribed by T. Skorodko; M. Bashkanov; H. Clement; E. Doroshkevich; O. Khakimova; F. Kren; G.J. Wagner

• Book ID: 104089449
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 279 KB
• Volume: 61
• Category: Article
• ISSN: 0146-6410
• DOI: 10.1016/j.ppnp.2007.12.030

✦ Synopsis

In most investigations the Roper resonance is sensed only very indirectly via complex partial wave analyses. We find indications for its excitation in the pp → npπ + reaction, where some resonance-like structure is observed in the invariant nπ + 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 pp → ppπ 0 π 0 the Roper excitation and its subsequent decay into N ππ 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.