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

HADES collaboration (99 authors); Blanco, A.; Fonte, P.; Lopes, L.; Mangiarotti, A.

http://hdl.handle.net/10400.26/27314

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HADES collaboration (99 authors)

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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.