Meson-meson scattering amplitudes in the modifiedK-matrix formalism
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This is correct only in the limit in which we have included all possible intermediate and external states. In our model we treat only a small number of allowed states and τ then describes in principle all that is left,i.e. higher cuts, poles, etc. Therefore it is related to the « driving terms » of the Roy equations as discussed by BFP (1). We include thed-waves and some coupled-channel effects explicitly; this justifies the assumptions discussed above.
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