omegarho0 Interference Effect in The pi+p --> pi+pi-Delta++ Interaction
Dec 8, 1969
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Abstract: (APS)
Evidence for a destructive interference effect between the ρ0 and ω→π+π− amplitudes has been observed in the channel π+p→π+π−Δ++ at 3.7-4.0 GeV/c. On the assumption of complete coherence between the ρ0 and ω→π+π− amplitude in a subsample, discussed in the text, a branching ratio (ω→π+π−)(ω→π+π−π0)=1.5% is obtained with a 95% confidence-level lower limit of 0.25%. The data do not lead to a significant upper limit. In terms of δ, the off-diagonal element of the ρ0ω mass-mixing matrix, these values are equivalent to δ=2.7 MeV and a lower limit of 1.1 MeV. Under conditions stated in the text, a value β=1.5±0.3 rad is obtained for the production phase of ρ0 relative to ω in the channel studied.References(15)
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