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

Abstract

The cross-sections of the pd →3He π0π0π0 and pd→3Heπ+π-π0 reactions have been measured at the beam kinetic energies Tp= 1360 MeV and Tp= 1450 MeV using the CELSIUS/WASA detector setup. At both energies, the differential cross-section dσ/dω of the η meson in the pd →3He η reaction shows a strong forward-backward asymmetry in the CMS. The ratio between the pd→3Heπ+π-π0 and pd→3Heπ0π0π0 cross-sections has been analysed in terms of isospin amplitudes. The reconstructed invariant-mass distributions of the ππ, 3Heπ and 3He2π systems provide hints on the role of nucleon resonances in the 3π production process. © 2010 SIF, Springer-Verlag Berlin Heidelberg.