Summary
The Lee model with cut-off is adapted to the case of a spin-one V particle interacting with two spin-zero particles in ap-wave state. The ρ0⟺π+ - system is then discussed in terms of this (much simplified) model. It is found, as might be expected, that the p-meson pole (on the second sheet) dominates ππ scattering in the model, and that the renormalized coupling constant is essentially independent of the cut-off.
Riassunto
Si adatta il modello di Lee con taglio al caso in cui una particella V di spin uno interagisce con due particelle di spin zero nello stato di ondap. Si discute poi il sistema ρ0⟺π+ - in base a questo modello (molto semplificato). Si trova, come ci si poteva attendere, che il polo del mesone √ (sul secondo foglietto) domina lo scattering ππ nel modello, e che la costante di accoppiamento rinormalizzata è essenzialmente indipendente dal taglio.
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References
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M. Lévy:Nuovo Cimento,13, 115 (1959).
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On leave of absence from the U.S. Naval Research Laboratory, Washington, D. C.
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Joseph, D.W., Wada, W.W. The Lee model and the √-meson. Nuovo Cim 31, 1070–1078 (1964). https://doi.org/10.1007/BF02821679
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DOI: https://doi.org/10.1007/BF02821679