Low-Mass (M<1.2 Gev/c^2) Sigma0 - Meson Produced in the System Pi+Pi- from the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

Details Low-Mass (M<1.2 Gev/c^2) Sigma0 - Meson Produced in the System Pi+Pi- from the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2 Low-Mass (M<1.2 Gev/c^2) Sigma0 - Meson Produced in the System Pi+Pi- from the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2

2006-11-20

arxiv.org/abs/hep-ex/0611033v2

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 3 figures, 1 tables; Presented at XVIII ISHEPP "Relativistic Nuclear Physics and Quantum Chromodynamics" JINR, Dubna,

Scientific paper

The production and properties of the resonances in the system of Pi+Pi- were studied in the reaction np --> npPi+Pi- at the momentum of incident neutrons Pn=(5.20 +/- 0.12)GeV/c. In this work in comparison with previous ones we made more hard selection of events taking into account track measurement precise. In the distribution of the Pi+Pi- combinations effective masses we have found 8 peculiarities. All the observable peculiarities have spins equal to zero. There were no corresponding picks in the Pi-PI- and Pi-Pi0 - systems in the reactions np --> npPi+Pi- Pi- and np --> npPi-Pi0. So, we have observed a row of resonances with a set of quantum numbers 0+(0++) -- SIGMA0 - mesons decaying on the channel SIGMA0 --> Pi+Pi-. The obtained in other experiments masses coincide with the sequence of masses observed in our experiment. Especially good coincidence can be obtained in the K-matrix approach (see RPP).

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