5 papers · 1 filter
Gauge-Invariant Off-Shell Mass
Kang-Sin Choi, Hyeseon Im
We define a gauge-invariant and renormalized off-shell mass function in quantum field theory. The conventional self-energy is gauge-dependent off-shell. We generalize the self-ener…
The Gauge-Invariant Mass Function
Kang-Sin Choi
In gauge theories, the mass of a field has been regarded as a purely on-shell concept: the pole mass is gauge-invariant, but the off-shell propagator has had no gauge-invariant def…
On the Gauge-Invariant Fermion
Kang-Sin Choi
We show that the Dirac dressing of the fermion is equivalent to a shift of the gauge parameter. For every gauge, the gauge-dependent part is projected out of physical observables.…
Self-Similar Structure of Loop Amplitudes and Renormalization
Kang-Sin Choi
We study the self-similar structure of loop amplitudes in quantum field theory and apply it to amplitude generation and renormalization. A renormalized amplitude can be regarded as…
Exact Renormalization of the Higgs Field
Kang-Sin Choi
Using Wilsonian renormalization, we calculate the quantum correction to observable quantities, rather than the bare parameters, of the Higgs field. A physical parameter, such as a…