The observation of collective effects in small systems, such as strangeness enhancement and the appearance of a ridge, have posed a challenge to conventional models for multiparton interactions and hadronization underlying general purpose MC event generators.
In this talk I will present the microscopic model for collective effects recently implemented in the Pythia8 and DIPSY event generators. In this model collectivity is generated from interactions between Lund strings, referred to as “string shoving” and “rope hadronization”. Rope hadronization is shown to give a good description of strangeness enhancement across pp, pA and AA collisions systems, while string shoving qualitatively describes the ridge observed in pp collisions.
A defining feature of the microscopic model is that all effects are generated without assuming a deconfined plasma or thermalization. Ongoing efforts aim towards further extending the models to pA and AA.
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