# Titelaufnahme

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In the third part of this thesis, we study the rapidity dependence of initial state momentum correlations and event-by-event geometry in p+Pb collisions at LHC energies $(\sqrt{s}=5.02~\rm{TeV})$ within the 3+1~D IP-Glasma model. We find that the event geometry is correlated across large rapidity intervals whereas initial state momentum correlations are relatively short range in rapidity. Based on our results, we discuss implications for the relevance of both effects in explaining the origin of collective phenomena in small systems.