The Quantum Numbers of the ω-Meson
In the analysis of the experimental material concerning the 3-pion resonance state, called ω-meson, the G-parity is an important quantum number. If only states with spin < 2 are considered, eight states have to be discussed. Only the symmetries 0-+ and 1-- seem to be compatible with the available material. The Dalitz plot favours slightly the symmetry 1--; the small width of the ω-resonance line favours slightly 0-+. A decision can probably be reached by studying the ratio R = (ω → neutrals)/(ω → π+ + π- + π0), which should be very small for 1--, but of the order of unity for 0--. If further experiments will confirm the slight indications in earlier reports, that the disintegration of ω into neutral particles does play an essential rôle in the decay of the ω-meson, the symmetry 1-- would be ruled out.
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