In Chapter 7, we discuss various aspects of the strong interaction containing a strong non-perturbative or low-scale component. We first briefly summarise the treatment of the total and inelastic cross sections through the analyticity of the scattering amplitude, which leads to the language of Regge poles. We introduce multiple parton interactions, with the underlying theoretical ideas for their description mainly driven by experimental data, before remarking on double parton scattering. Hadronisation, i.e. the transition from the parton of perturbation theory to the observable hadrons, is introduced by first using the idea of fragmentation functions and then discussing two popular phenomenological models describing this transition. We conclude this chapter by remarking on some ideas concerning the description of hadron decays through effective models.
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