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The pp -> pp pi pi pi reaction channels in the threshold region

WASA Collaboration, C. Pauly, M. Jacewicz, I. Koch, M. Bashkanov, D. Bogoslawsky, H. Calén, F. Capellaro, H. Clement, L. Demirörs, C. Ekström, K. Fransson, L. Gustafsson, B. Höistad, G. Ivanov, E. Jiganov, T. Johansson, S. Keleta, S. Kullander, A. Kupść, A. Kuznetsov, P. Marciniewski, R. Meier, B. Morosov, W. Oelert, H. Pettersson, Y. Petukhov, A. Povtorejko, R. J. M. Y. Ruber, W. Scobel, K. Schönning, T. Skorodko, B. Shwartz, V. Sopov, J. Stepaniak, V. Tchernyshev, P. Thörngren Engblom, V. Tikhomirov, A. Turowiecki, G. J. Wagner, U. Wiedner, M. Wolke, A. Yamamoto, J. Zabierowski, J. Złomańczuk

nucl-exarXiv:nucl-ex/0602006

Abstract

The cross section for prompt neutral and charged three pion production in pp interactions was measured at excess energies in the range 160 - 217 MeV. That comprises the first measurement of the pp->pp pi0pi0pi0 reaction and the comparison with the pp->pp pi+pi-pi0 reaction, in a very direct way. The experiment was performed above the eta meson production threshold and the cross section normalization was obtained from a concurrent measurement of the reaction pp->pp eta with the eta decaying into 3 pions. Since the same final states are selected, the measurement has a low systematical error. The measured cross section ratio sigma(pp->pp pi+pi-pi0)/sigma(pp->pp pi0π0π0) is compared to predictions of dominance of different isobars in the intermediate state.

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