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

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

2006-02-06

arxiv.org/abs/nucl-ex/0602006v2

Phys.Lett.B649:122-127,2007

Physics

Nuclear Physics

Nuclear Experiment

12 pages, 4 figures New discussion on the pp->pp3pi reaction mechanism

Scientific paper

10.1016/j.physletb.2007.04.004

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.

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