Very short proper-time between particle emission and absorption, if the loop is thought of as a sum over particle paths.
The shape of the generated electrical pulse varies with the particle path through the aperture.
In the aperture format, signal processing algorithms can be used to correct for artifacts resulting from particle path.
The nonrelativistic formulation is traditionally given in terms of particle paths, not fields.
Schwinger believed in the formalism of local fields, while Feynman had faith in the particle paths.
The delicate traceries of particle paths were recorded as flashes and sparkles in the house of iron outside.
Electron optics is a mathematical framework for the calculation of particle paths along given electrostatic or magnetostatic fields.
Smoke and dye experiments usually show particle paths or streaklines (Section 6.1).
A Feynman diagram is a representation of quantum field theory processes in terms of particle paths.
In a microtron, due to the electrons different relativistic mass, the particle paths are different for each pass.
