Production of $ \eta$ and 3$ \pi$ mesons in the pd $ \rightarrow$ 3HeX reaction at 1360 and 1450 MeV

Le résumé fourni par la source

The cross-sections of the pd $ \rightarrow$ 3He $ \eta$ , pd $ \rightarrow$ 3He $ \pi^{0}_{}$ $ \pi^{0}_{}$ $ \pi^{0}_{}$ and pd $ \rightarrow$ 3He $ \pi^{+}_{}$ $ \pi^{-}_{}$ $ \pi^{0}_{}$ reactions have been measured at the beam kinetic energies T p= 1360 MeV and T p= 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section $\tfrac{{d\sigma }} {{d\Omega }}$ of the $ \eta$ meson in the pd $ \rightarrow$ 3He $ \eta$ reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd $ \rightarrow$ 3He $ \pi^{+}_{}$ $ \pi^{-}_{}$ $ \pi^{0}_{}$ and pd $ \rightarrow$ 3He $ \pi^{0}_{}$ $ \pi^{0}_{}$ $ \pi^{0}_{}$ cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the $ \pi$ $ \pi$ , 3He $\displaystyle \pi$ and 3He2 $ \pi$ systems provide hints on the role of nucleon resonances in the 3 $ \pi$ production process.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.