Analysis of pion production data measured by HADES in proton-proton collisions at 1.25 GeV

• Main Author: HADES collaboration (99 authors)
• Publication Date: 2017
• Other Authors: Blanco, A., Fonte, P., Lopes, L., Mangiarotti, A.
• Format: Article
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://dx.doi.org/10.1140/epja/i2015-15137-5; http://hdl.handle.net/10400.26/27314

Baryon resonance production in proton-proton collisions at a kinetic beam energy of 1.25 GeV is investigated. The multi-differential data were measured by the HADES Collaboration. Exclusive channels with one pion in the final state ($np\pi^+$ and $pp\pi^0$ were put to extended studies based on various observables in the framework of a one-pion exchange model and with solutions obtained within the framework of a partial wave analysis (PWA) of the Bonn-Gatchina group. The results of the PWA confirm the dominant contribution of the $\Delta(1232)$, yet with a sizable impact of the $N(1440)$ and non-resonant partial waves.