Summary
It is shown that the observed cross-sections for the γγ → ρ0ρ0 and γγ → ρ+ρ− reactions near threshold can be explained by taking into account the effects not only of a resonance withI=0, but also of interference between the resonant amplitude and the nonresonant amplitude for theI=2 state.
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References
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Minami, S. Is the resonance interpretation for σ(γγ → ρ0ρ0) ruled out by the data for ρ+ρ− production?. Lett. Nuovo Cimento 39, 65–68 (1984). https://doi.org/10.1007/BF02813865
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DOI: https://doi.org/10.1007/BF02813865