Type of Document	Dissertation
Author	Kiswandhi, Alvin Stanza
Author's Email Address	alvinstanza@gmail.com
URN	etd-08242008-185555
Title	A Model for Double-Pion and Pion-Eta Photoproduction
Degree	Doctor of Philosophy
Department	Physics, Department of
Advisory Committee	Advisor Name Title Simon Capstick Committee Chair Jorge Piekarewicz Committee Member Laura Reina Committee Member Paul Eugenio Committee Member Ettore Aldrovandi Outside Committee Member
Keywords	Pion-eta Photoproduction Double-Pion Photoproduction Lippmann-Schwinger Equation Hadron Reaction Model Baryon Spectroscopy Baryon Properties Phenomenological Lagrangian Approach
Date of Defense	2008-07-30
Availability	unrestricted
Abstract We describe a model of general two-to-two-body and two-to-three-body hadronic reaction based on a phenomenological Lagrangian approach that satisfies two-body unitary and is relativistic. This model is used to study pion-eta photoproduction. Unitarity is ensured by using the Lippmann-Schwinger equation to iterate the vertices and dress the propagators to all orders, and by including all possible two-body and quasi-two-body intermediate channels. We also study different approximations of the intermediate momenta in a diagram. Gauge invariance is used as a criterion to choose the best approximation. This model has been tested by investigating the nonresonant interactions of double-pion and pion-eta photoproduction, in which significant effects are observed. A preliminary comparison of our calculation to an existing pion-eta photoproduction study is made, and is shown to produce consistent results.
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