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ISSN - 14346001, EISSN - 1434601X, European Physical Journal A, 2010, vol. 45, p. 11-21

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

Schönning K., Bargholtz Chr, Bashkanov M., Berlowski M., Bogoslawsky D., Calén H., Clement H., Demirörs L., Ekström C., Fransson K., Gerén L., Gustafsson L., Höistad B., Ivanov G., Jacewicz M., Jiganov E., Johansson T., Keleta S., Khakimova O., Kren F., Kullander S., Kupsc A., Kuzmin A., Lindberg K., Marciniewski P., Morosov B., Oelert W., Pauly C., Petrén H., Petukhov Y., Povtorejko A., Scobel W., Shafigullin R., Shwartz B., Skorodko T., Sopov V., Stepaniak J., Tegnér P. E., Engblom P. Thörngren, Tikhomirov V., Turowiecki A., Wagner G. J., Wolke M., Zabierowski J., Zartova I., Złomanczuk J.

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.