Master thesis defense by Anne Mette Frejsel – University of Copenhagen

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Master thesis defense by Anne Mette Frejsel

Title: Morphological Study of Heavy Ion Collisions Using CMB Methods

Abstract:
This thesis implements methods developed for Cosmic Microwave Background (CMB) analysis into the framework of heavy ion physics. This is done in order to investigate simulations of high-multiplicity heavy ion collisions (events) on an event-by-event basis. A qualitative method for determining the elliptic flow amplitude and the event plane angle on an event-by-event basis is developed. The CMB methods are based on the decomposition of a signal into spherical harmonics. Using the coefficients of the decomposition, called a_lm, an analytical formula for extracting information on both odd and even collective flow moments in a heavy ion event is derived. It is shown that elliptic flow is tightly connected to the a_22 coefficient. The data analysis is done on both simple toy model simulations and on HIJING (Heavy-Ion Jet INteraction Generator) simulations. A linear relationship is seen for both toy model and HIJING simulations (as predicted from the analytical formula). The methods developed here should be applicable for higher order flow as well.