The pd → 3 Heηπ 0 reaction at Tp = 1450 MeV

• Published in: Physics letters. B 2010, Vol.685 (1), p.33
• Main Authors: Schönning, Karin, Bargholtz, Chr, Bashkanov, M., Berlowski, M., Bogoslawsky, D., Calén, Hans, Clement, H., Demirors, L., Ekström, Curt, Fransson, Kjell, Geren, L., Gustafsson, Leif, Höistad, Bo, Ivanov, G., Jacewicz, Marek, Jiganov, E., Johansson, Tord, Keleta, Samson, Khakimowa, O., Kren, F., Kullander, Sven, Kupsc, Andrzej, Kuzmin, A., Lindberg, K., Marciniewski, Pawel, Morosov, B., Oelert, W., Pauly, C., Petrén, Henrik, Petukhov, Y., Povtorejko, A., Scobel, W., Shafigullin, R., Shwartz, B., Skorodko, T., Sopov, V., Stepaniak, J., Tegner, P.-E., Thörngren Engblom, Pia, Tikhomirov, V., Turowiecki, A., Wagner, G. J., Wilkin, C., Wolke, Magnus, Zabierowski, J., Zartova, I., Zlomanczuk, Jozef
• Format: Article
• Language: English
• Subjects: eta; Fysik; Fysik med inriktning mot kärnfysik; invariant mass distribution; Kärnfysik; Mellanenergifysik; Middle energy physics; NATURAL SCIENCES; NATURVETENSKAP; Nuclear physics; Physics; Physics with specialization in Nuclear Physics; pi0 meson production; Δ resonance
• ISSN: 1873-2445; 0370-2693
• DOI: 10.1016/j.physletb.2010.01.042

The cross section for the pd→ 3 Heηπ 0 reaction has been measured at a beam energy of 1450 MeV using the WASA detector at the CELSIUS storage ring and detecting one 3 He and four photons from the decays of the two mesons. The data indicate that the production mechanism involves the formation of the Δ(1232) isobar. Although the beam energy does not allow the full peak of this resonance to be seen, the invariant masses of all three pairs of final particles are well reproduce dby a phase space Monte Carlo simulation weighted with the p-wave factor of the square of the π 0 momentum in the 3 He π 0 system.