N(ππ)Sdecay: A flux-tube-model picture

We calculate the ${N\left(\pi \pi \right)}_S$ decay width of nucleon resonances up to 2 GeV within the frame of a semirelativistic flux-tube model, using the constant amplitude flux-tube-breaking decay mechanism. To deal with the absence of a known $q\overline{q}$ intermediate state of sufficiently low mass, we use a pseudoresonating intermediate state with no assumption on its composition other than the flux-tube structure constraints. Its mass, width, and radius are varied. The agreement with data is comparable to the one obtained for other hadronic strong decay channels calculations if the intermediate state has a mass of about 600 and a typical hadronic radius, a result consistent with $\pi \pi$ strong final-state interaction.