Dissertations, Theses, and Capstone Projects

Date of Degree

9-2022

Document Type

Dissertation

Degree Name

Ph.D.

Program

Physics

Advisor

Stefan Bathe

Committee Members

Adrian Dumitru

Jamal Jalilian-Marian

Paul Stankus

Brian Tiburzi

Subject Categories

Nuclear

Keywords

quark-gluon plasma, high energy, QCD, photon, pion, heavy ion

Abstract

A reaction plane dependent event mixing technique is developed to remove the collective background from two particle correlation measurements in heavy ion collisions. The method eliminates the need for any external flow measurements and is well suited for studying the path length dependence of particle production in quark-gluon plasma. Central to mid-central, as well as in vs out-of-plane, per neutral pion trigger integrated away-side hadron yield comparisons are made. Results suggest a significant path length dependent partonic energy loss in the medium. A tagging method is also introduced to measure the direct photon yield for various collision criteria. Direct photon – hadron yields are measured. A comparison of central to mid-central yields reveals a significant suppression of the away-side hadrons in higher multiplicity events. The reaction plane dependence of the associated away-side yield is explored.

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