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1	Four-Body Treatment of the Hydrogen-Antihydrogen System Stegeby, Henrik January 2012 (has links) This thesis presents a nonadiabatic (4-body) description of the hydrogen-antihydrogen system at a nonrelativistic level. The properties of the system, the rearrangement processes and the possible existence of resonance states are investigated by using a variational method for coupled arrangement channels, the Gaussian Expansion Method, and the stabilization method. The 4-body basis set is optimized by means of prediagonalization of 2-body fragments. In paper I, a mass-scaling procedure of the Born-Oppenheimer potential is introduced for the description of the relative motion between hydrogen and antihydrogen. The nonadiabaticity of the system is investigated in paper II. Antimatter antihydrogen four-body system Adiabatic approximation Born-Oppenheimer elastic scattering stabilization method resonance states coupled arrangement channels coupled rearrangement channels Gaussian Expansion Method Antimateria antiväte fyrkroppars system adiabatisk approximation stabilisationsmetoden resonanstillstånd spridningstillstånd kopplade arrangemangskanaler