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Fall 2018
In this thesis, based on the work of refs. [1, 2], we study the mass difference between the 1S spin-singlet and spin-triplet bottom quark-antiquark bound states within the effective theory of lattice non-relativistic quantum chromodynamics (NRQCD). The precise determination of this value, called...
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Fall 2013
We study the mass difference between the spin singlet and spin triplet states of heavy quarkonium. The quarkonium meson is a non-relativistic quark-antiquark bound-state of quantum chromodynamics (QCD). We set up a matching procedure between the perturbative analysis of the short-distance...
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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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Fall 2011
Bhabha Scattering is the scattering of an electron off of a positron; it is everywhere in particle physics and plays a special role in particle phenomenology. Its particular use as a luminosity measure in particle colliders gives great motivation to reduce the theoretical uncertainty in the cross...
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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...