Principal Component Analyses of Final States in Relativistic Nuclear Collisions using PYTHIA/Angantyr

University essay from Lunds universitet/Teoretisk partikelfysik

Abstract: We develop a program to perform a principal component analysis of flow fluctuations using simulations of nuclear collisions produced by the PYTHIA/Angantyr event generator. We consider both p+p and p+Pb collision events and study the leading and subleading modes of the second flow harmonic. The analysis is carried out using two different definitions of the flow matrix which differ in their sensitivity to multiplicity fluctuations. We also study the effect on the flow fluctuations of two collective mechanisms modeled by Angantyr: string shoving and colour reconnection.

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