Abstract.
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.
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Communicated by J. Bijnens
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Schönning, K., Bargholtz, C., Bashkanov, M. et al. Production of \( \eta\) and 3\( \pi\) mesons in the pd \( \rightarrow\) 3HeX reaction at 1360 and 1450 MeV. Eur. Phys. J. A 45, 11–21 (2010). https://doi.org/10.1140/epja/i2010-10981-3
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DOI: https://doi.org/10.1140/epja/i2010-10981-3