Production of η and 3 π mesons in the pd → 3 HeX reaction at 1360 and 1450 MeV

. The cross-sections of the pd → 3 He η , pd → 3 He π^0_ π^0_ π^0_ and pd → 3 He π^+_ π^-_ π^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 dσdΩ of the η meson in the pd → 3 He η reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd → 3 He π^+_ π^-_ π^0_ and pd → 3 He π^0_ π^0_ π^0_ cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the π π , 3 He π and 3 He2 π systems provide hints on the role of nucleon resonances in the 3 π production process.