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Bound State Phenomena: Positronium Molecule and Muon Decays, and the Electron Magnetic Moment
DownloadFall 2021
Particle physics is the study of the fundamental constituents of matter and their interactions. The study of bound states of elementary particles such as positronium and dipositronium, whose lifetime is short, is important for understanding properties of bound leptons with precision. The...
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Spring 2016
We study the mass difference between the spin singlet and spin triplet states of positronium and heavy quarkonium, an effect which is referred to as the hyperfine splitting. For positronium, a bound state of an electron and a positron, we analyze the one-loop nonrelativistic effective Hamiltonian...
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Spring 2010
A recent study of the positronium atom showed that the energy levels could be determined numerically using an effective field theory just as easily as the underlying true theory. Here, we expand on this idea by modeling the three-body positronium-ion and four-body di-positronium molecule with...
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Fall 2011
Positronium consists of an electron and positron in a bound state, a purely leptonic system and therefore an excellent test of QED (quantum electrodynamics). The ground state is characterized by two different spin configurations: spin-singlet and spin-triplet states. The difference between the...