The pp -> pp pi pi pi reaction channels in the threshold region
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 pi0\pi0\pi0) is compared to predictions of dominance of different isobars in the intermediate state.
Keywords
Cite
@article{arxiv.nucl-ex/0602006,
title = {The pp -> pp pi pi pi reaction channels in the threshold region},
author = {WASA Collaboration and C. Pauly and M. Jacewicz and I. Koch and M. Bashkanov and D. Bogoslawsky and H. Calén and F. Capellaro and H. Clement and L. Demirörs and C. Ekström and K. Fransson and L. Gustafsson and B. Höistad and G. Ivanov and E. Jiganov and T. Johansson and S. Keleta and S. Kullander and A. Kupść and A. Kuznetsov and P. Marciniewski and R. Meier and B. Morosov and W. Oelert and H. Pettersson and Y. Petukhov and A. Povtorejko and R. J. M. Y. Ruber and W. Scobel and K. Schönning and T. Skorodko and B. Shwartz and V. Sopov and J. Stepaniak and V. Tchernyshev and P. Thörngren Engblom and V. Tikhomirov and A. Turowiecki and G. J. Wagner and U. Wiedner and M. Wolke and A. Yamamoto and J. Zabierowski and J. Złomańczuk},
journal= {arXiv preprint arXiv:nucl-ex/0602006},
year = {2012}
}
Comments
12 pages, 4 figures New discussion on the pp->pp3pi reaction mechanism